Arctic Cat SD-ROM 2008 Service Manual

FOREWORD

This Arctic Cat Service Manual contains service and maintenance information for the Model Year 2008 Arctic Cat 2- Stroke Snowmobiles. This manual is designed to aid service personnel in service-oriented applications.

This manual is divided into sections. The sections cover specific snowmobile components or systems and, in addition to the standard service procedures, includes assembling, disassembling, and inspecting instructions. When using this manual as a guide, the technician should use discretion as to how much disassembly is needed to correct any given condition.

The service technician should become familiar with the operation and construction of the components or systems by carefully studying the complete manual. This will assist the service technician in becoming more aware of and efficient with servicing procedures. Such efficiency not only helps build consumer confidence but also saves time and labor.

All Arctic Cat publications and snowmobile decals display the words Warning, Caution, and Note to emphasize important information. The symbol ! WARNING identifies personal safety-related information. Be sure to follow the directive because it deals with the possibility of severe personal injury or even death. The symbol ! CAUTION

identifies unsafe practices which may result in snowmobile-related damage. Follow the directive because it deals with the possibility of damaging part or parts of the snowmobile. The symbol NOTE: identifies supplementary information worthy of particular attention.

At the time of publication, all information, photographs, and illustrations were technically correct. Some photographs and illustrations used in this manual are used for clarity purposes only and are not designed to depict actual conditions. Because Arctic Cat Inc. constantly refines and improves its products, no retroactive obligation is incurred.

All materials and specifications are subject to change without notice.

Keep this manual accessible in the shop area for reference.

Product Service and Warranty Department

Arctic Cat Inc.

© 2007 Arctic Cat Inc.	September 2007
®™ Trademarks of Arctic Cat Inc., Thief River

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TABLE OF

CONTENTS

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Foreword

SHARE OUR PASSION.TM

Section

1.General Information/Specifications

2-Stroke

2.Engine

3.Engine-Related Items

4.Fuel Systems

5.Electrical Systems

6.Drive Train and Brake Systems

087. Track/Rear Suspension

8. Steering and Body SNOWMOBILE

Service Manual

SECTION 1 —

GENERAL INFORMATION/

SPECIFICATIONS

TABLE OF

CONTENTS

Snowmobile Identification .......................................	1-2
Recommended Gasoline and Oil ............................	1-2
Break-In Procedure.................................................	1-2
Genuine Parts .........................................................	1-3
High Altitude Operation...........................................	1-3
Preparation For Storage..........................................	1-4
Preparation After Storage .......................................	1-6
After Break-In Checkup (100 Miles) ........................	1-6
After Break-In Checkup Checklist ...........................	1-7
Arctic Cat Engine Specifications .............................	1-8
Cylinder Head Volume Specifications .....................	1-9
Engine Piston Travel Versus
Crank Angle Chart ...............................................	1-9
Crankshaft Runout/Repair Specifications .............	1-10
Fraction/Decimal Conversion Chart ......................	1-11
Drill Bit Sizes (Number) Chart...............................	1-11
MM/IN. Conversion Chart......................................	1-11
Torque Conversions (ft-lb/N-m) .............................	1-12
Tightening Torque (General Bolts) ........................	1-12
Assembly Schematics/Torque Specifications
(Table of Contents).............................................	1-12
Arctic Power Valve (APV) System
Specifications.....................................................	1-25
Oil Consumption Specifications ............................	1-26
EFI Specifications .................................................	1-26
Carburetor Specifications......................................	1-26

1

Fuel Pump Specifications......................................	1-26
Mikuni Tuning Components...................................	1-27
Major Tuning Components ....................................	1-28
Electrical Specifications ........................................	1-29
Ignition Timing Specifications................................	1-35
Steering/Body Torque Specifications ....................	1-37
Drive System Specifications..................................	1-38
Drive Clutch/Driven Pulley-Related
Specifications.....................................................	1-41
Arctic Cat Drive Belt Dimension Chart ..................	1-41
Drive System Components ...................................	1-42
Arctic Cat Cam Arms.............................................	1-43
Arctic Cat Cam Arm Profiles .................................	1-44
Chain Case Performance Calibrations ..................	1-47
Gear Case Performance Calibrations ...................	1-49
Chains and Sprockets ...........................................	1-50
Drive System Torque Specifications......................	1-51
Rear Suspension Torque Specifications ...............	1-51
Drive Sprocket Location Specifications .................	1-52
Track Warranty Guidelines ....................................	1-53
Track Specifications...............................................	1-54
Idler Wheel Dimensions ........................................	1-54
Front Suspension Specifications ...........................	1-54
Rear Suspension Specifications ...........................	1-55
Non-Rebuildable Shock Specifications .................	1-55
Rebuildable Shock Specifications .........................	1-56

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Snowmobile

Identification

The Arctic Cat Snowmobile has two important identification numbers. The Vehicle Identification Number (VIN) is stamped into the tunnel near the right-side footrest. The Engine Serial Number (ESN) is stamped into the crankcase of the engine.

0726-383

NOTE: The VIN also appears on a decal beneath the seat (Crossfire/M-Series) or attached to the right-side tunnel (remaining models). The decal also displays pertinent production information.

These numbers are required to complete warranty claims properly. No warranty will be allowed by Arctic Cat Inc. if the engine serial number or VIN is removed or mutilated in any way.

Recommended

Gasoline and Oil

RECOMMENDED GASOLINE

(Carbureted Models)

The recommended gasoline to use in these snowmobiles is 87 octane regular unleaded.

NOTE: In many areas, oxygenates (either ethanol or MTBE) are added to the gasoline. Oxygenated gasolines containing up to 10% ethanol or up to 15% MTBE are acceptable gasolines; however, whenever using oxygenated gasolines, the carburetor main jet must be one size larger than the main jet required for regular unleaded gasoline. For example, if a 220 main jet is recommended for regular unleaded gasoline, a 230 main jet must be installed if using an oxygenated gasoline.

When using ethanol blended gasoline, it is not necessary to add a gasoline antifreeze since ethanol will prevent the accumulation of moisture in the fuel system.

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! CAUTION

Do not use white gas or gasolines containing methanol. Only Arctic Cat approved gasoline additives should be used.

RECOMMENDED GASOLINE

(EFI Models)

The recommended gasoline to use in these snowmobiles is 87 octane regular unleaded. In many areas, oxygenates (either ethanol or MTBE) are added to the gasoline. Oxygenated gasolines containing up to 10% ethanol or up to 15% MTBE are acceptable gasolines. Do not use gasolines containing methanol.

NOTE: For optimum performance, do not exceed the recommended 87 octane gasoline. Using a higher octane gasoline will not increase overall performance.

! CAUTION

Do not use white gas or gasoline containing methanol. Only Arctic Cat approved gasoline additives should be used.

RECOMMENDED OIL

The recommended oil to use in the oil-injection system is Arctic Cat 50:1 Injection Oil (for standard models) or Arctic Cat Synthetic APV 2-Cycle Oil (for APV models). The oil is specially formulated to be used either as an injection oil or as a pre-mix oil (for carbureted model break-in) and meets all of the lubrication requirements of the Arctic Cat snowmobile engine.

Break-In Procedure

The Arctic Cat 2-stroke engine (when new or rebuilt) requires a short break-in period before the engine is subjected to heavy load conditions. Arctic Cat requires that the first tankful of fuel be premixed at a 100:1 ratio in all oil-injection models.

During the break-in period, a maximum of 1/2 throttle is recommended; however, brief full-throttle accelerations and variations in driving speeds contribute to good engine break-in.

! CAUTION

DO NOT exceed the one (1) tankful limitation of a 100:1 gas/oil break-in mixture. Continuous use of a gas/oil mixture, unless consistently operating in extremely cold conditions (-26°C/-15°F or colder), could cause spark plug fouling and excessive carbon buildup. A 100:1 gas/oil mixture must be used in conjunction with the oil-injection system to ensure adequate engine lubrication in extremely cold conditions.

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Genuine Parts

When replacement of parts is necessary, use only genuine Arctic Cat parts. They are precision-made to ensure high quality and correct fit.

High Altitude Operation

Operating a snowmobile at varying altitudes requires changes in performance components. These changes affect drive train components (on all models) and carburetion components (on carbureted models).

High altitude information decal(s) are located beneath the hood of the snowmobile.

! CAUTION

On carbureted models, carefully follow the Main Jet Chart recommendations for proper main jet selection for altitude, temperature, and gasoline being used.

The M-Series snowmobiles are initially set up at the factory for operation between 6000-9000 feet. Consult the appropriate specifications for this information.

Following are basic high altitude theories for clutching, engine, suspension, and track.

CLUTCHING

As altitude changes, engine horsepower changes with it. As you go up in altitude, the engine loses horsepower. Because of this, the constant velocity transmission (CVT) system needs to be changed to compensate for the horsepower loss.

At altitudes above 5000 ft, clutch engagement RPM is normally higher than the standard setting. This is due to the horsepower loss at altitude as opposed to what would be seen for horsepower at sea level. The engine will lose peak horsepower but will also lose horsepower at engagement speed. For this reason, higher engagement speeds are usually needed at altitude in order to attain acceptable acceleration. This higher engagement speed can be attained several ways. Some of the methods will affect other characteristics of CVT operation, so you must be careful what you change. Drive clutch springs are the most common way to increase engagement speed; however, by simply changing the cam arms to a lighter weight from the heavier sea level cam arm, you will gain some engagement speed.

Then there are other more complicated methods such as engagement notches and changing the position of the cam arm center of gravity in relation to the roller. This is called “tucking the weight” and can be used, but, like the engagement notch, it can hurt belt life.

The driven clutch will also play a part in CVT tuning for high altitude operation. A steeper helix angle in the driven clutch will mean a quicker up-shift. A shallower angle will mean a slower up-shift. If the up-shift is too quick, due to a very steep helix, RPM will be pulled down under the peak operating RPM of the engine (where the horsepower is) and performance will suffer. The engine may even bog. If you have a helix that is too shallow, the engine may over-rev or have poor acceleration. Usually, angles shallower than the sea level calibrations work best. The driven spring will also affect driven clutch tuning. Tighten the spring, and RPM will increase. Loosen the spring, and RPM will decrease. The spring should be used to finetune and complement the helix selection.

Carburetor calibration changes for high altitude operation will have an effect on the CVT system and how it operates. It is important that you understand the basics of CVT operation in order to make the correct high altitude CVT calibration changes.

ENGINE

Engines generate more horsepower at sea level than they do at higher altitudes. There are many reasons for

this, but the biggest reason is that the higher you go, 1 less oxygen is available for the engine to use during its combustion process. Less oxygen means it needs less

fuel to obtain the correct air/fuel ratio to operate properly. This is why the fuel ratio has to be recalibrated. At high altitude, engines operate as though they have a lower compression ratio. This, along with less oxygen and less fuel, means that the engine generates slightly less horsepower at higher altitudes.

The carbureted models will also have lower pressure applied to the float chamber because of pressure changes in the atmosphere between high altitude and sea level. All of these characteristics will become more evident the higher the altitude.

It will be necessary to make changes to the fuel systems (carbureted models) and drive systems that support engine operation as altitude changes.

SUSPENSION

The different riding styles of the individual operator, the varying snow conditions, and the type of terrain are all factors that affect the suspension at high altitude. Trail riding versus powder riding versus combination riding will all require different suspension settings.

The normal setting for front ski suspension is as little spring pre-load tension as possible for powder snow riding. This will allow the skis to float across the snow with the least amount of resistance. Trail riding will require more spring tension to carry the varying load more effectively. There are many different settings and spring tensions to consider when adjusting for riding style and snow conditions.

The rear suspension has a number of spring settings that produce different riding characteristics.

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The front arm spring and shock will also affect the ride and handling when either on a trail or in powder snow. A strong spring setting on this shock will cause the snowmobile to tend to “dig” more when riding in the powder rather than climbing up on top of the snow. But, it will work more effectively when riding on a trail. A softer spring setting will allow the front of the rear suspension to collapse much quicker and change the angle of the track to the snow. A more gradual angle will tend to raise the snowmobile up on the snow rather than digging into it.

There are many variables and adjustments that are possible to the rear suspension depending on snow conditions, riding style, and type of terrain. These adjustments can be made to individualize the snowmobile to the riding style of the operator.

M-Series/Crossfire

As snow cover and riding conditions change, there are several different adjustments that can be made to change the ride and handling characteristics for operator preference. Located on the front suspension arm are limiter straps. They limit the amount of “fallout” the front arm can have. These straps may be adjusted in or out due to conditions and riding style. The more the straps are brought up, the more steering power the operator has due to the amount of ski pressure.

Another adjustment that can be made on the rear suspension is the front shock spring tension. As trail conditions change, the spring pre-load may be used to decrease the chance of the front end “bottoming out.” With a stiffer spring pre-load, the ride of the snowmobile will improve on the trail but will affect the performance in the deep powder snow. In deep powder snow, the stiffer spring pre-load will cause the front-end to “dig” and possibly take longer for it to plane off. There are several different-rate springs available for different riding styles and terrain conditions.

On the standard models the front shock springs are also individually adjustable for the terrain conditions and driving style of the operator. The spring adjuster has been set at the factory so the correct amount of threads are exposed between the spring adjuster and the shock housing as an initial setting. Additional ski pressure can be obtained by tightening the spring tension; ski pressure can be decreased by relaxing spring tension. There are springs with different spring rates available for operator choice and snow conditions. There is a limit as to how far you can pre-load the springs before “coil bind” takes effect. This is when the wire on the spring actually runs into itself and causes binding. Equal adjustments should be maintained on both sides of the snowmobile. On the Sno Pro models with air shocks, they are individually adjustable for the terrain conditions and driving style of the operator. The ski shocks

are preset at 4.6 kg/cm2 (65 psi) as an initial setting on

the Crossfire Sno Pro models or at 4.2 kg/cm2 (60 psi) on the M-Series Sno Pro models. The rear arm shock is

preset at 9.8 kg/cm2 (140 psi) on the M-Sereis Sno Pro. It is possible to “fine tune” the shocks to match the operator’s weight, riding style, and terrain conditions.

NOTE: Care should be taken to have equal pressure in the shocks before operating the snowmobile.

Finally, track tension should be looked at to make sure that it is within recommended specifications to affect the efficiency of the snowmobile. On models with the torque sensing link, the track is actually tightening as the suspension moves through its range of motion causing the track to sag in the middle and rub on the top part of the rear suspension arm.

TRACK

Carefully matching the riding requirements to the type of track will ensure the maximum use of all available engine power. Lug height and track durometer are the two main concerns when selecting a track for various riding styles.

There are tracks with lug heights from 0.750 in. up to 2.25 in. to accommodate various snow conditions. Generally, the deeper the snow, the taller the lug. It must be noted that the installation of any deep-lug track may reduce top end speed and promote premature wear strip wear in marginal snow conditions.

Durometer is a measurement of how hard a rubber is. The lugs on most tracks range between 60 and 80 durometer. On the durometer scale, the higher the number, the harder the lugs. For riding in deep powder, a softer 60 durometer track works best. The softer rubber allows the track to “give” a little and pack the snow creating lift rather than digging its way straight down. When hill-climbing, the harder lug of an 80 durometer track works the best due to penetrating the hard snow creating more bite.

Some tracks come with a dual durometer rating, such as a track with a 80/60 durometer rating. The lugs on this track are 80% 80 durometer rubber, and the top 20% is made of the softer 60 durometer rubber. This track is designed to be a good all-around track for riding mostly in deep powder but can climb the occasional hard snow hill.

Preparation For Storage

Prior to storing the snowmobile, it must be properly serviced to prevent corrosion and component deterioration. An authorized Arctic Cat Snowmobile dealer should perform this service; however, the owner/operator can perform this service if desired. To prepare the snowmobile for storage, Arctic Cat recommends the following procedure:

1.Clean the seat cushion with a damp cloth and Arctic Cat Vinyl Protectant.

2.Clean the snowmobile thoroughly by hosing dirt, oil, grass, and other foreign matter from the skid frame, tunnel, hood, and belly pan. Allow the snowmobile to dry thoroughly. DO NOT get water into any part of the engine.

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3.Place the rear of the snowmobile up on a shielded safety stand.

NOTE: On all models except the 370 cc/570 cc, the air silencer boot can be pried forward to access the intake bores. Pry the boot forward; then proceed to step 7.

NOTE: On the Bearcat/Panther models, the airintake silencer includes a cover/tool tray assembly and a baffle/resonator, and the silencer boot cannot be removed to access the intake bores. Proceed to step 4.

4.Open the air-intake silencer cover; then remove the three screws securing the cover/tool tray assembly to the silencer.

5.Close the cover; then tip the cover/tool tray assembly forward and out of its slots and remove the assembly.

6.Using a large flat-blade screwdriver, remove the baffle/resonator tabs from the air-intake silencer slots and remove the baffle/resonator to access the intake bores.

NOTE: The baffle/resonator can be removed more easily by removing the back tabs first.

7.Start the engine and allow to idle. With the engine idling, spray Arctic Cat Engine Storage Preserver into the intake(s) until the engine exhaust starts to smoke heavily or until the engine starts to drop in RPM. Turn engine off.

NOTE: On all models except the 370 cc/570 cc, secure the air silencer boots onto the intake bores.

NOTE: On the Bearcat/Panther models, install the baffle/resonator and the cover/tool tray assembly.

8.Plug the exhaust system outlet with a clean cloth.

9.With the ignition switch in the OFF position:

A.Disconnect the high tension lead(s) from the spark plug(s); then remove the plug(s), connect it/them to the lead(s), and ground it/them on the cylinder head(s).

! CAUTION

Never crank the engine over without grounding the spark plug(s). Damage to ignition system may result.

B.Pour 29.5 ml (1 fl oz) of SAE #30 petroleumbased oil into each spark plug hole and pull the recoil starter handle slowly about 10 times.

C.Install the spark plug(s) and connect the high tension lead(s).

10.On carbureted models, drain the gas from each carburetor float chamber.

11.Fill the gas tank to its rated capacity; then add Arctic Cat Fuel Stabilizer to the gas tank following directions on the container for the stabilizer/gasoline ratio. Tighten the gas tank cap securely.

12.On models with a chain case, drain the lubricant by removing the chain-case drain plug located on the backside of the chain-case assembly. Remove the chain-case cover and inspect chain, sprockets, chain tensioner, and rollers for wear and the chain for proper tension. Install the drain plug, chaincase cover, and seal; then pour Arctic Cat Transmission Lube into the filler hole - 354 ml (12 fl oz).

13.On models with a gear case, change the gear case lubricant (see Section 6).

14.Clean and inspect the drive clutch and driven pulley.

15.Remove the drive belt from the drive clutch/driven pulley. Lay the belt on a flat surface or slide it into a cardboard sleeve to prevent warping or distortion during storage; then clean and inspect the drive clutch and driven pulley.

16.Apply light oil to the upper steering post bushing, 1 ski spindles and bolts, front and rear pivot bush-

ings of the skid frame, and plungers of the shock absorbers.

17.Lubricate all grease fittings (front and rear suspension, spindles, speedometer drive adapter, and the driven shaft support bearing) with a low-tempera- ture grease.

18.Tighten all nuts, bolts, and cap screws making sure all calibrated nuts, bolts, and cap screws are tightened to specifications. Make sure all rivets holding the components together are tight. Replace all loose rivets.

19.Clean and polish the hood, console, and chassis with Arctic Cat Hood and Windshield Cleaner/ Polish. DO NOT USE SOLVENTS OR SPRAY CLEANERS. THE PROPELLENT WILL DAMAGE THE FINISH.

20.On electric start models, disconnect the battery cables making sure to disconnect the negative cable first; then clean the battery posts and cables.

! CAUTION

Batteries require charging if left for extended nonstart periods. Arctic Cat recommends trickle charging once a month. Follow the manufacturer’s instructions and cautions.

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! CAUTION

On models with remote start, make sure to leave the battery cables disconnected. Failure to disconnect the battery cables when storing the snowmobile for a prolonged period of time (six weeks or more) will result in a discharged or damaged battery.

21.If possible, store the snowmobile indoors. Raise the track off the floor by blocking up the back end making sure the snowmobile is secure. Loosen the track adjusting bolts to reduce track tension. Cover the snowmobile with a machine cover or a heavy, ventilated tarpaulin to protect it from dirt and dust.

22.If the snowmobile must be stored outdoors, position the snowmobile out of direct sunlight; then block the entire snowmobile off the ground making sure the snowmobile is secure. Loosen the track adjusting bolts to reduce track tension. Cover with a machine cover or a heavy, ventilated tarpaulin to protect it from dirt, dust, and rain.

! CAUTION

Avoid storing in direct sunlight and using a plastic cover as moisture may collect on the snowmobile causing corrosion.

Preparation After

Storage

Taking the snowmobile out of storage and correctly preparing it for another season will assure many miles and hours of trouble-free snowmobiling. Arctic Cat recommends the following procedure:

! CAUTION

On carbureted models if the gas in each carburetor float chamber was not drained prior to storage, the carburetor(s) must be cleaned before starting the engine.

1.Clean the snowmobile thoroughly. Polish the exterior of the snowmobile.

2.Clean the engine. Remove the cloth from the exhaust system. Check exhaust system and airintake silencer/air filter for obstructions.

3.Inspect all control wires and cables for signs of wear or fraying. Replace if necessary. Use cable ties or tape to route wires and cables away from hot or rotating parts.

4.Inspect the drive belt for cracks and tears. Check belt specifications. Replace if damaged or worn. Install the drive belt.

NOTE: If the old belt is worn but in reasonable condition, retain it with the snowmobile as a spare in case of emergency.

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5.On carbureted models, inspect the in-line fuel filter and replace if necessary.

6.Inspect all fuel hoses and oil hoses for deterioration or cracks; replace if necessary. Make sure all connections are tight; then fill the oil-injection reservoir with the recommended injection oil.

NOTE: After prolonged storage, Arctic Cat recommends one tankful of 100:1 gas/oil mixture be used in conjunction with the oil-injection system to ensure proper lubrication.

7.Inspect the entire brake system, all controls, headlight, taillight, brakelight, ski wear bars, and headlight aim; adjust or replace as necessary.

8.Inspect each spark plug. Replace, gap, or clean as necessary.

9.Adjust the track to the proper tension and alignment. Lock the jam nuts.

10.Adjust the carburetor(s) and choke cable on carbureted models and throttle cable on all models.

! WARNING

On carbureted models, be sure to tighten the swivel adapter jam nuts securely. If a jam nut isn’t tightened, the adjuster can rotate out of the carburetor cap causing the piston valve not to return to the fullclosed position.

11.Tighten all nuts, bolts, and cap screws making sure all calibrated nuts, bolts, and cap screws are tightened to specifications.

12.Lubricate all grease fittings (rear suspension, spindles, speedometer drive adapter, and the driven shaft support bearing) with a low-temperature grease.

13.On liquid cooled models, check the coolant level and all coolant hoses and connections for deterioration or cracks. Add properly mixed coolant as necessary.

14.On fan cooled models, clean the engine cooling fins and all vents.

15.On electric start models, charge the battery; then connect the battery cables making sure to connect the positive cable first. Test the electric start system.

After Break-In Checkup

(100 Miles)

There are three areas that require adjustment after the break-in period in order to obtain peak performance. These areas are carburetor jetting, drive belt deflec- tion/break-in, and track tension and alignment.

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CARBURETOR JETTING (Carbureted Models) —

Altitude, temperature, and the use of oxygenated gasoline affect the carburetion needed for optimum engine performance. The carburetor main jets must be changed in conjunction with changes in operating altitude, oxygenated gasoline usage, and temperature.

DRIVE BELT DEFLECTION — Drive belt deflection is very important to the snowmobile. Even if it is checked and is correct when the snowmobile is set up, it does change (more so during the break-in period). This is because the rubber engine mounts and the rubber snubber on the torque link will all take a “set” during the first 100 miles, which allows the distance between the drive clutch and driven pulley to shorten. When this happens, the snowmobile will appear to have a too long drive belt. To add to this, the drive belt itself wears and stretches somewhat. This all leads to a low-end performance problem and, if not corrected, causes premature drive belt wear.

After the break-in period, drive belt deflection should be checked according to the instructions given in this manual.

DRIVE BELT BREAK-IN — It is critical for maximum drive belt life to allow the belt to break in before subjecting it to hard use such as wide-open-throttle operation or hill climbing.

The first 20 miles on the drive belt should be at 1/2 throttle or lower. This will allow the belt to gain its optimum flexibility and will extend belt life. Do not exceed 50 MPH during the first 20 miles.

If this procedure isn’t followed, it is possible to destroy a new drive belt in less than 50 miles. This should be explained to customers at the time of drive belt sales.

To increase the life of a drive belt, it is very important that the belt be warmed up before subjecting it to any type of use. In cold temperature (0° or below), the engine should be allowed to idle for a period of 8 to 10 minutes. This will allow heat from the engine compartment to soften the drive belt. Not only will this procedure increase belt life but will also help prevent engine damage from cold seizure.

Each operator should be instructed to drive the snowmobile for several minutes at a low throttle setting to warm the belt up before using wide-open-throttle. This practice should be followed on all models for maximum belt life.

In addition to instructing each operator about these drive belt break-in procedures, Arctic Cat also recommends that the operators be informed that a drive belt (like brake pads, wear strips, etc.) is considered a normal wear item and is listed as an exclusion on the Arctic Cat Limited Warranty.

TRACK TENSION AND ALIGNMENT — There is a certain amount of stretch on all tracks during the first 500 miles. The track must be adjusted after the first 50 to 100 miles to the specifications given in the Setup and Pre-delivery Manual and periodically thereafter. If these adjustments aren’t performed, the track may “derail” which leads to track and slide rail damage.

Along with these three major areas, there are also other areas that should be checked and adjusted during the “After Break-In Checkup.” A checklist to assist you with this service follows. Not only will the customer be happier, but it also gets the customer back into your dealership, which in many cases will mean additional sales in accessories, belts, oil, etc.

After Break-In Checkup

Checklist

Below is a recommended list of items to check after the break-in period. By performing this inspection, warranty cost can be reduced and customer satisfaction can be increased.

The recommended mileage for this inspection is 1 between 100 and 300 miles. Please encourage the customers to have this important checkup done.

Jet carburetor(s) according to average temperature, type of gasoline being used, and altitude

Check drive belt deflection

Adjust track tension and alignment

Check throttle cable tension

Check oil-injection pump adjustment

Check engine idle

Check coolant level

Check chain case/gear case lubricant level

Check lights (high/low beam, brakelight)

Check safety switch operation

Check driveshaft area for any rubbing components

Check steering hardware for tightness

Check skid frame and A-arm mounting hardware for tightness

Check brake lever travel and adjustment

Grease all lubrication points

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Arctic Cat Engine

Specifications

ITEM		370 cc	500 cc	570 cc	600 cc	800 cc	1000 cc
Engine Model Number		AB37A1	AX50L7	AA56A7	AJ60L5	AB80L1	AB10L2
Displacement	— cc	367	499	565	599	794	999
	— cu in.	22.41	30.4	34.5	36.54	48.45	60.96
No. of Cylinders		2	2	2	2	2	2
Bore	— mm	60	71	73.8	73.8	85	90.3
	— in.	2.362	2.795	2.910	2.906	3.346	3.556
Stroke	— mm	65	63	66	70	70	78
	— in.	2.559	2.480	2.598	2.755	2.755	3.071
Compression Ratio		6.30:1	6.38:1	6.41:1	6.46:1	6.39:1	6.41:1
Cooling System		Fan Cooled	Liquid Cooled	Fan Cooled	Liquid Cooled	Liquid Cooled	Liquid Cooled
Gasoline Octane (min)		87	87	87	87	87	87
Fuel Mixture		Oil Injection	Oil Injection	Oil Injection	Oil Injection	Oil Injection	Oil Injection
Ignition Timing	degrees	18	12	20	15	15	12*	15**
Engine Warm	— mm	2.012	0.867	2.522	1.509	1.509	1.062	1.655
@2000 RPM	— in.	0.079	0.034	0.099	0.059	0.059	0.042	0.065
Spark Plug (NGK)		BR9EYA	BR9EYA	BR9EYA	BR9EYA	BR9EYA	BR9EYA
Spark Plug Gap	— mm	0.7-0.8	0.7-0.8	0.7-0.8	0.7-0.8	0.7-0.8	0.7-0.8
	— in.	0.028-0.031	0.028-0.031	0.028-0.031	0.028-0.031	0.028-0.031	0.028-0.031
Lighting Coil Output		12V/185W	12V/280W	12V/210W	12V/280W	12V/280W	12V/280W
Ignition Type		CDI/NOI	CDI/NOI	CDI/NOI	CD/NOI	CDI/NOI	CDI/NOI
Piston Skirt/Cylinder	— mm	0.066-0.086	0.075-0.105	0.085-0.115	0.075-0.105	0.075-0.105	0.075-0.105
Clearance Range	— in.	0.0026-0.0034	0.0029-0.0041	0.0035-0.0045	0.0029-0.0041	0.0029-0.0041	0.0029-0.0041
Piston Ring End Gap	— mm	0.15-0.35	0.20-0.40	0.30-0.50	0.30-0.50	0.30-0.50	0.30-0.50
Range	— in.	0.006-0.014	0.008-0.016	0.012-0.0196	0.012-0.0196	0.012-0.0196	0.012-0.0196
Cylinder Trueness	— mm	0.1	0.1	0.1	0.1	0.1	0.1
Limit (max)	— in.	0.004	0.004	0.004	0.004	0.004	0.004
Piston Pin Diameter	— mm	17.995-18.000	21.995-22.000	17.995-18.000	21.995-22.000	21.995-22.000	23.995-24.000
Range	— in.	0.7085-0.7087	0.8659-0.8661	0.7085-0.7087	0.8659-0.8661	0.8659-0.8661	0.9447-0.9449
Piston Pin Bore	— mm	18.002-18.010	22.002-22.010	18.002-18.010	22.002-22.010	22.002-22.010	24.002-24.010
Diameter Range	— in.	0.7087-0.7090	0.8662-0.8665	0.7087-0.7090	0.8662-0.8665	0.8662-0.8665	0.9450-0.9453
Connecting Rod	— mm	23.003-23.011	27.003-27.011	23.003-23.011	27.003-27.011	27.003-27.011	29.003-29.011
Small End Bore	— in.	0.9056-0.9059	1.0631-1.0634	0.9056-0.9059	1.0631-1.0634	1.0631-1.0634	1.1410-1.1420
Diameter Range
Connecting Rod	— mm	0.003-0.020	0.003-0.020	0.003-0.020	0.003-0.020	0.003-0.020	0.003-0.020
Radial Play Range	— in.	0.0001-0.0008	0.0001-0.0008	0.0001-0.0008	0.0001-0.0008	0.0001-0.0008	0.0001-0.0008
Crankshaft Runout	— mm	0.05	0.05	0.05	0.05	0.05	0.05
(t.i.r.)	— in.	0.002	0.002	0.002	0.002	0.002	0.002
Crankshaft End Play	— mm	0.05-0.10	0.05-0.10	0.05-0.10	0.05-0.10	0.05-0.10	0.05-0.10
Range	— in.	0.002-0.004	0.002-0.004	0.002-0.004	0.002-0.004	0.002-0.004	0.002-0.004
Reed Stopper Height	— mm	N/A	8.0	6.0	11.0	11.0	13.0
	— in.		0.315	0.236	0.433	0.433	0.512

*F-Series/Crossfire

**M-Series

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Cylinder Head Volume

Specifications

NOTE: For cylinder head volume tests, see appropriate Measuring Critical Components sub-section in

Section 2.

ENGINE TYPE	SQUISH - GAP		ENGINE TYPE		SQUISH - GAP
370 cc	mm	2.27-2.95	600 cc	mm	1.5
	in.	.089-.116		in.	.059
500 cc	mm	1.5	800 cc	mm	1.5
	in.	.059		in.	.059
570 cc	mm	1.69	1000 cc	mm	1.49
	in.	.066		in.	.058

! CAUTION

These specifications are not intended to be used for engine modification. Reducing the head volume to a smaller specification could cause piston detonation problems which is not a warranty situation.

Engine Piston Travel
Versus Crank Angle
Chart	1

NOTE: When using any of the charts blow, first know the engine stroke and timing in degrees; then select the proper chart and read across from the degree figure to find timing in either mm or inches.

	500 cc		600/800 cc		370 cc		570 cc		1000 cc
	63 mm stroke		70 mm stroke		65 mm stroke		66 mm stroke		78 mm stroke
Degree	mm BTDC	in. BTDC	mm BTDC	in. BTDC	mm BTDC	in. BTDC	mm BTDC	in. BTDC	mm BTDC	in. BTDC
BTDC
12	0.867	0.034	0.969	0.038	0.901	0.035	0.917	0.036	1.062	0.042
15	1.351	0.053	1.509	0.059	1.403	0.055	1.429	0.056	1.655	0.065
18	1.937	0.076	2.164	0.085	2.012	0.079	2.049	0.081	2.374	0.093
20	2.384	0.094	2.663	0.105	2.476	0.097	2.522	0.099	2.869	0.113

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Crankshaft Runout/

Repair Specifications

For those who have crankshaft work sent out to another shop, it is advisable to provide them with this information.

To use the specifications, first refer to the drawing; then find the letter which indicates the specification and refer to the chart below the illustration. Be sure to note the proper engine column. Specifications are called out in both millimeters and inches.

NOTE: We have given the proper location for checking crankshaft runout as the very edge of the straight portion of the shaft where the oil seal makes contact. From the illustration, note that Arctic Cat has called out three check points: at either end, out on the taper as shown, and also on the center bearing race. The crankshaft is still supported on the outer bearings using V blocks. The maximum runout shouldn’t exceed 0.05 mm (0.002 in.).

										728-144A
Engine		Bore X	A	B	C		G		Runout D
		Stroke						and F Point
									(± .002)
370 cc	mm	60 X 65	100 ± 0.15	55 ± 0.15	100	22		D 35		F 22
	(in.)		(3.937 ± 0.006)	(2.165 ± 0.006)	(3.937)	(0.866)		(1.377)		(0.866)
									(± .002)
500 cc	mm	71 X 63	114.7 ± 0.15	66.5 ± 0.15	106 ± 0.4	27		D 5		F 5
	(in.)		(4.515 ± 0.006)	(2.618 ± 0.006)	(4.465 ± 0.015)	(1.062)		(0.196)		(0.197)
									(± .002)
570 cc	mm	73.8 X 66	119 ± 0.15	62.3 ± 0.15	109.7	24		D 30		F 15
	(in.)		(4.70 ± 0.006)	(2.45 ± 0.006)	(4.320)	(0.945)		(1.181)		(0.590)
									(± .002)
600 cc	mm	73.8 X 70	119.7 ± 0.15	64 ± 0.15	118 ± 0.4	30		D 5		F 5
	(in.)		(4.712 ± 0.006)	(2.519 ± 0.006)	(4.645 ± 0.015)	(1.181)		(0.196)		(0.196)
									(± .002)
800 cc	mm	85 X 70	120.7 ± 0.15	64 ± 0.15	118 ± 0.4	30		D 5		F 5
	(in.)		(4.751 ± 0.006)	(2.519 ± 0.006)	(4.645 ± 0.015)	(1.181)		(0.196)		(0.196)
									(± .002)
1000 cc	mm	90.3 X 78	129.6 ± 0.15	71 ± 0.15	128 + 0-0.4	32		D 5		F 5
	(in.)		(5.10 ± 0.006)	(2.79 ± 0.006)	(5.04 + 0-0.015)	(1.26)		(1.196)		(0.196)

NOTE: Measure in from the shaft end the specified amount when checking runout at points D and F.

When checking runout in the center, place indicator on center of bearing as shown at point E. Maximum runout at any of the 3 measuring points is ±0.05 mm (0.002 in.).

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Fraction/Decimal		MM/IN. Conversion
Conversion Chart		Chart

	8ths	16ths	32nds	64ths	64ths (cont)
1/8 = .125		1/16 = .0625	1/32 = .03125	1/64 = .015625	33/64 = .515625
1/4 = .250		3/16 = .1875	3/32 = .09375	3/64 = .046875	35/64 = .546875
3/8 = .375		5/16 = .3125	5/32 = .15625	5/64 = .078125	37/64 = .578125
1/2 = .500		7/16 = .4375	7/32 = .21875	7/64 = .109375	39/64 = .609375
5/8 = .625		9/16 = .5625	9/32 = .28125	9/64 = .140625	41/64 = .640625
3/4 = .750		11/16 = .6875	11/32 = .34375	11/64 = .171875	43/64 = .671875
7/8 = .875		13/16 = .8125	13/32 = .40625	13/64 = .203125	45/64 = .703125
	—	15/16 = .9375	15/32 = .46875	15/64 = .234370	47/64 = .734375
	—	—	17/32 = .53125	17/64 = .265625	49/64 = .765625
	—	—	19/32 = .59375	19/64 = .296875	51/64 = .796875
	—	—	21/32 = .65625	21/64 = .328125	53/64 = .828125
	—	—	23/32 = .71875	23/64 = .359375	55/64 = .859375
	—	—	25/32 = .78125	25/64 = .390625	57/64 = .890625
	—	—	27/32 = .84375	27/64 = .421875	59/64 = .921875
	—	—	29/32 = .90625	29/64 = .453125	61/64 = .953125
	—	—	31/32 = .96875	31/64 = .484375	63/64 = .984375

Drill Bit Sizes

(Number) Chart

	Size of		Size of		Size of		Size of
No.	Drill in	No.	Drill in	No.	Drill in	No.	Drill in
	Inches		Inches		Inches		Inches
1	.2280	21	.1590	41	.0960	61	.0390
2	.2210	22	.1570	42	.0935	62	.0380
3	.2130	23	.1540	43	.0890	63	.0370
4	.2090	24	.1520	44	.0860	64	.0360
5	.2055	25	.1495	45	.0820	65	.0350
6	.2040	26	.1470	46	.0810	66	.0330
7	.2010	27	.1440	47	.0785	67	.0320
8	.1990	28	.1405	48	.0760	68	.0310
9	.1960	29	.1360	49	.0730	69	.0292
10	.1935	30	.1285	50	.0700	70	.0280
11	.1910	31	.1200	51	.0670	71	.0260
12	.1890	32	.1160	52	.0635	72	.0250
13	.1850	33	.1130	53	.0595	73	.0240
14	.1820	34	.1110	54	.0550	74	.0225
15	.1800	35	.1100	55	.0520	75	.0210
16	.1770	36	.1065	56	.0465	76	.0200
17	.1730	37	.1040	57	.0430	77	.0180
18	.1695	38	.1015	58	.0420	78	.0160
19	.1660	39	.0995	59	.0410	79	.0145
20	.1610	40	.0980	60	.0400	80	.0135

	mm	in.	mm	in.	mm	in.	mm	in.
	.01	.00039	.51	.02008	1	.03937	51	2.00787
	.02	.00079	.52	.02047	2	.07874	52	2.04724
	.03	.00118	.53	.02087	3	.11811	53	2.08661
	.04	.00157	.54	.02126	4	.15748	54	2.12598
	.05	.00197	.55	.02165	5	.19685	55	2.16535
	.06	.00236	.56	.02205	6	.23622	56	2.20472
	.07	.00276	.57	.02244	7	.27559	57	2.24409
	.08	.00315	.58	.02283	8	.31496	58	2.28346
	.09	.00354	.59	.02323	9	.35433	59	2.32283
	.10	.00394	.60	.02362	10	.39370	60	2.36220
	.11	.00433	.61	.02402	11	.43307	61	2.40157
	.12	.00472	.62	.02441	12	.47244	62	2.44094
	.13	.00512	.63	.02480	13	.51181	63	2.48031
	.14	.00551	.64	.02520	14	.55118	64	2.51968
	.15	.00591	.65	.02559	15	.59055	65	2.55905
	.16	.00630	.66	.02598	16	.62992	66	2.59842
	.17	.00669	.67	.02638	17	.66929	67	2.63779
										1
	.18	.00709	.68	.02677	18	.70866	68	2.67716
	.19	.00748	.69	.02717	19	.74803	69	2.71653
	.20	.00787	.70	.02756	20	.78740	70	2.75590
	.21	.00827	.71	.02795	21	.82677	71	2.79527
	.22	.00866	.72	.02835	22	.86614	72	2.83464
	.23	.00906	.73	.02874	23	.90551	73	2.87401
	.24	.00945	.74	.02913	24	.94488	74	2.91338
	.25	.00984	.75	.02953	25	.98425	75	2.95275
	.26	.01024	.76	.02992	26	1.02362	76	2.99212
	.27	.01063	.77	.03032	27	1.06299	77	3.03149
	.28	.01102	.78	.03071	28	1.10236	78	3.07086
	.29	.01142	.79	.03110	29	1.14173	79	3.11023
	.30	.01181	.80	.03150	30	1.18110	80	3.14960
	.31	.01220	.81	.03189	31	1.22047	81	3.18897
	.32	.01260	.82	.03228	32	1.25984	82	3.22834
	.33	.01299	.83	.03268	33	1.29921	83	3.26771
	.34	.01339	.84	.03307	34	1.33858	84	3.30708
	.35	.01378	.85	.03346	35	1.37795	85	3.34645
	.36	.01417	.86	.03386	36	1.41732	86	3.38582
	.37	.01457	.87	.03425	37	1.45669	87	3.42519
	.38	.01496	.88	.03465	38	1.49606	88	3.46456
	.39	.01535	.89	.03504	39	1.53543	89	3.50393
	.40	.01575	.90	.03543	40	1.57480	90	3.54330
	.41	.01614	.91	.03583	41	1.61417	91	3.58267
	.42	.01654	.92	.03622	42	1.65354	92	3.62204
	.43	.01693	.93	.03661	43	1.69291	93	3.66141
	.44	.01732	.94	.03701	44	1.73228	94	3.70078
	.45	.01772	.95	.03740	45	1.77165	95	3.74015
	.46	.01811	.96	.03780	46	1.81102	96	3.77952
	.47	.01850	.97	.03819	47	1.85039	97	3.81889
	.48	.01890	.98	.03858	48	1.88976	98	3.85826
	.49	.01929	.99	.03898	49	1.92913	99	3.89763
	.50	.01969	1.0	.03937	50	1.96850	100	3.93700

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Torque Conversions

(ft-lb/N-m)

ft-lb	N-m	ft-lb	N-m	ft-lb	N-m	ft-lb	N-m
1	1.4	26	35.4	51	69.4	76	103.4
2	2.7	27	36.7	52	70.7	77	104.7
3	4.1	28	38.1	53	72.1	78	106.1
4	5.4	29	39.4	54	73.4	79	107.4
5	6.8	30	40.8	55	74.8	80	108.8
6	8.2	31	42.2	56	76.2	81	110.2
7	9.5	32	43.5	57	77.5	82	111.5
8	10.9	33	44.9	58	78.9	83	112.9
9	12.2	34	46.2	59	80.2	84	114.2
10	13.6	35	47.6	60	81.6	85	115.6
11	15	36	49	61	83	86	117
12	16.3	37	50.3	62	84.3	87	118.3
13	17.7	38	51.7	63	85.7	88	119.7
14	19	39	53	64	87	89	121
15	20.4	40	54.4	65	88.4	90	122.4
16	21.8	41	55.8	66	89.8	91	123.8
17	23.1	42	57.1	67	91.1	92	125.1
18	24.5	43	58.5	68	92.5	93	126.5
19	25.8	44	59.8	69	93.8	94	127.8
20	27.2	45	61.2	70	95.2	95	129.2
21	28.6	46	62.6	71	96.6	96	130.6
22	29.9	47	63.9	72	97.9	97	131.9
23	31.3	48	65.3	73	99.3	98	133.3
24	32.6	49	66.6	74	100.6	99	134.6
25	34	50	68	75	102	100	136

Tightening Torque

(General Bolts)

Type of Bolt	Thread	Tightening
	Diameter A	Torque
	(mm)
(Conventional or 4 Marked Bolt)	5	12-36 in.-lb
	6	36-60 in.-lb
	8	7-11 ft-lb
	10	16-25 ft-lb
(7 Marked Bolt)	5	24-48 in.-lb
	6	6-8 ft-lb
	8	13-20 ft-lb
	10	29-43 ft-lb

Assembly Schematics/

Torque Specifications

(Table of Contents)

Servicing Symbols.................................................	1-13
370 cc....................................................................	1-14
570 cc....................................................................	1-16
500 cc....................................................................	1-18
600 cc....................................................................	1-20
800 cc....................................................................	1-22
1000 cc..................................................................	1-24

Servicing Symbols

Listed in the table below are symbols indicating special instructions and other important information necessary for proper servicing. Please note the definition for each symbol. These symbols are used throughout this manual.

NOTE: Before engine assembly, ensure all threaded areas are clean to assure an accurate torque value is achieved.

! CAUTION

Torque values have a range of + or - 20%.

SYMBOL

DESCRIPTION

Torque control required

243 - apply blue Loctite #243

270 - apply green Loctite #270

271 - apply red Loctite #271

609 - apply green Loctite #609

Lubricate with Arctic Cat 50:1

Injection Oil - Non-APV Engines

Lubricate with Arctic Cat Synthetic

APV 2-Cycle Oil - APV Engines

Lubricate with Arctic Cat

Low-Temp Grease

3B - Three Bond Sealant

HT - High-Temp Sealant

AS - Anti-Seize Thread Compound

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370 cc

1

370-ENG08

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1-13Next

370ENG08_2

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570 cc

1

570-ENG08

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1-15Next

570ENG07

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500 cc

1

500CC1A08

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1-17Next

500CC2A_08

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600 cc

1

600CC1B_08

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600CC2A_08

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800 cc

1

800_08_1

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800_08_2

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1000 cc

1

1000_08_2

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1000_07_1

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Arctic Power Valve

(APV) System

Specifications

NOTE: The servo will activate once at APV cycle

RPM. If the servo cycles three times, cable length adjustment or valve inspection is required.

APV Position/RPM

ENGINE	VALVE POSITION	CYCLE RPM
600 cc	Full-Open	73-7400 (Low/High Alt)
800 cc	Mid-Open	60-6500 (Low/High Alt)
	Full-Open	78-8100 (Low/High Alt)
1000 cc	Mid-Open	6300 (Low/High Alt)
	Full-Open	6500 (Low/High Alt)

NOTE: The 800 cc and 1000 cc have a three-stage exhaust valve system. The stages are closed, midopen, and full-open. Each model has a designated RPM at which the system is synchronized and checked by the ECU for proper operation. This occurs once each time the engine is started. The 800 cc system is checked at 4800 RPM and the 1000 cc system is checked at 6100 RPM (Crossfire/ F-Series) or at 6270 RPM (M-Series).

F-Series

741-635A

Crossfire/M-Series

(600 cc)

0739-715

Crossfire/M-Series

(800/1000 cc)

	742-209A
APV CABLE LENGTH
ENGINE	CENTER ± 1 mm (0.039 in.)
600 cc	36.0 mm (1.417 in.)
800/1000 cc	35.0 mm (1.377 in.)

1

0735-516

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Oil Consumption

Specifications

ENGINE	RPM	FULL-CLOSED	FULL-OPEN
		(Idle)	2 Minutes
		3 Minutes
370 cc	2000	0.9-1.9 cc	4.9-6.6 cc
500 cc	1833	1.0-2.5 cc	7.4-10.3 cc
570 cc	2000	1.4-2.2 cc	6.9-9.4 cc
600 cc	1833	1.3-3.2 cc	10.9-15.2 cc
800 cc	1833	2.1-4.5 cc	12.7-17.6 cc
1000 cc	1833	2.2-4.9 cc	15.8-22.0 cc

EFI Specifications

Fuel Pressure	42.8-47.3 psi
Coolant Temperature Sensor	194°-206° F (90°-97° C)
(Closes)
Throttle Valve Angle - Volts	0.714-0.814	- Idle
(500 cc)	3.507-4.014	- Full-Open
Throttle Valve Angle - Volts	0.646-0.7540		- Idle
(600/800 cc)	3.472-4.0485		- Full-Open
Throttle Valve Angle - Volts	0.595-0.695	- Idle
(1000 cc)	3.477-4.054	- Full-Open

Carburetor

Specifications

			MAIN		JET	PILOT		PILOT AIR	FLOAT HEIGHT
	ENGINE	TYPE		NEEDLE JET			CUT-AWAY	SCREW	SETTING
			JET		NEEDLE	JET
								(TURNS OUT)	(mm)
	370 cc	VM-32	250	P-5M (953)	6DH7-3	40	2.5	1	22-24
	570 cc	VM-34	220	P-4M (961)	6CE25-3	40	3.0	1 1/2	22-24

NOTE: The above specifications are production settings. For high altitude jetting and settings, refer to the jet chart beneath the snowmobile hood.

Fuel Pump

Specifications

RPM		PSI	KG/CM2
1000-2000	3.0-3.5		0.21-0.25
3000-4000	4.5-5.5		0.32-0.39
5000-6000	6.0-7.0		0.42-0.49

VACUUM @ 2-3000 RPM

7-10 in.-hg	175-250 mm-hg

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Mikuni Tuning

Components

MAIN JETS AVAILABLE

JET	P/N	JET	P/N
130	6505-216	210	6505-145
140	6505-217	220	6505-137
150	6505-168	230	6505-067
160	6505-064	240	6505-079
170	6505-065	250	6505-068
180	6505-056	260	6505-017
190	6505-066	270	6505-069
200	6505-144	280	6505-080

PISTON VALVES AVAILABLE

SLIDE	CARB. SIZE (mm)	P/N
2.5	32-34	6505-246
3.5	32-34	6505-248
2.5	34	6505-500
2.5	34	6505-614*
3.0	34	6505-507
3.0	34	6505-561*

* For models with carburetor switch

1

						NEEDLE JETS AVAILABLE
	JET NEEDLES AVAILABLE
						NEEDLE JET	P/N
JET NEEDLE		P/N	JET NEEDLE	P/N
						P-4M (961)	6506-407
6CE25		6506-408	6DH3	6505-509		P-5M (953)	6506-405
6CH3		6505-519	6DH4	6505-003
6DH2		6505-252	6DH7	6505-215

			INLET NEEDLE ASSEMBLIES AVAILABLE
			SEAT DIA.	CARB. SIZE (mm)	P/N
			1.5 mm (Steel)	28, 30, 32, 34	6505-026
			1.5 mm (Viton)	28, 30, 32, 34	6505-160
PILOT JETS AVAILABLE
JET NO.	P/N		1.5 mm (Steel)	28 — 34 GVM	6505-245
35	6505-029
40	6505-047

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Major Tuning

Components

To assist you in selecting three major tuning components of the carburetor, listed below are the jet needles, pilot jets, and piston valves on charts according to their size.

PISTON VALVES

JET NEEDLES

LEAN 3.5

LEAN 6CE25

3.0

6DH2

RICH 2.5

6DH3

6DH4

6DH7

RICH

NOTE: The above chart shows the average performance of a given needle between 1/4 and 3/4 throttle. Needles are constructed in such a way that at any given point, the needle could be richer or leaner than the rating it has.

PILOT JETS

LEAN 35

RICH 40

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