Kymco MO MXU250 Service Manual - chap03 (manutenzione)

3. INSPECTION/ADJUSTMENT
MXU 250
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INSPECTION/ADJUSTMENT
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SERVICE INFORMATION------------------------------------------------ 3- 1 MAINTENANCE SCHEDULE-------------------------------------------- 3- 2 FUEL LINE/THROTTLE OPERATION/AIR CLEANER ------------ 3- 3 AIR FILTER FOR DRIVE BELT ----------------------------------------- 3- 5 SECONDARY AUR SUPPLY SYSTEM/SPARK PLUG ------------- 3- 6 VALVE CLEARANCE----------------------------------------------------- 3- 7 CARBURETOR IDLE SPEED/IGNITION TIMING ------------------ 3- 8 CYLINDER COMPRESSION/ ENGINE OIL--------------------------- 3- 9 TRANSMISSION OIL REPLACEMENT ------------------------------- 3-11 DRIVE BELT/BRAKE PADS INSPECTION--------------------------- 3-12 BRAKE FLUID INSPECTION/ HEADLIGHT AIM------------------- 3-13 STEERING SYSTEM INSPECTION------------------------------------- 3-14 TOE-IN ADJUSTMENT --------------------------------------------------- 3-15 WHEELS/TIRES ------------------------------------------------------------ 3-16 DRIVE CHAIN SLACK ADJUSTMENT-------------------------------- 3-18 DRIVE SELECT LEVER ADJUSTMENT ------------------------------ 3-20 CABLE INSPECTION AND LUBRICATION-------------------------- 3-21 REAR SUSPENSION LUBRICATION---------------------------------- 3-21 COOLING SYSTEM-------------------------------------------------------- 3-22 SPARK ARRESTER CLEANING (OFF ROAD)----------------------- 3-23
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3. INSPECTION/ADJUSTMENT
MXU 250
SERVICE INFORMATION
GENERAL
WARNING
Before running the engine, make sure that the working area is well-ventilated. Never run the engine in a closed area. The exhaust contains poisonous carbon monoxide gas which may cause death to people.
Gasoline is extremely flammable and is explosive under some conditions. The working area must be well-ventilated and do not smoke or allow flames or sparks near the working area or fuel storage area.
SPECIFICATIONS
ENGINE Throttle grip free play : 14 mm (0.040.16 in) Spark plug gap : 0.60.7 mm (0.0020.003 in) Spark plug: Standard : DPR7EA-9 Valve clearance : IN: 0.1 mm (0.004 in)
EX: 0.1 mm (0.004 in) Idle speed : 1500±100 rpm Engine oil capacity: At disassembly : 1.6 liter (1.4 lmp qt, 1.7 Us qt) At change : 1.4 liter (1.23 lmp qt, 1.48 Us qt) Gear oil capacity : At disassembly : 400 cc (0.35 lmp qt, 0.42 Us qt) At change : 300 cc (0.26 lmp qt, 0.32 Us qt) Cylinder compression : 15±2 kg/cm² Ignition timing : BTDC 5°±1°/2000 rpm
TIRE PRESSURE
Front 0.28 kgf/cm² (28 Kpa, 3.2 psi)
Rear 0.28 kgf/cm² (28 Kpa, 3.2 psi)
TIRE SIZE: Front : 22*7-10 Rear : 22*10-10
TORQUE VALUES
Front wheel nut 4.5 kgf-m (45 Nm, 32 lbf-ft) Rear wheel nut 4.5 kgf-m (45Nm, 32 lbf-ft)
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3. INSPECTION/ADJUSTMENT
MAINTENANCE SCHEDULE
This chapter includes all information necessary to perform recommended inspections and adjustments. These preventive maintenance procedures, if followed, will ensure more reliable vehicle operation and a longer service life. The need for costly overhaul work will be greatly reduced. This information applies to vehicles already in service ad well as new vehicles that are being prepared for sale. All service technicians should be familiar with this entire chapter.
MXU 250
In the interest of safety, we recommend these items should be serviced only by an authorized
KYMCO motorcycle dealer.
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3. INSPECTION/ADJUSTMENT
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FUEL LINE
Check the fuel tubes and replace any parts, which show signs of deterioration, damage or leakage.
Do not smoke or allow flames or sparks in your working area.
MXU 250
Fuel Filte
Fuel tubes
THROTTLE OPERATION
Check the throttle to swing for smooth movement. Measure the throttle to swing free play.
Free Play (A): 14 mm (0.040.16 in) To adjust throttle free play:
Slide the rubber sleeve back to expose the throttle cable adjuster.
Loosen the lock nut, then turn the adjuster to obtain the correct free play. (1~4 mm or
0.04~0.16 in) Tighten the lock nut and reinstall the sleeve.
AIR CLEANER
AIR CLEANER REPLACEMENT
Remove the seat. (See page 2-3) Unlatch the four retainer clips (1) and
remove the air cleaner housing cover (2).
Lock nu
Rubber sleeve
Cable adjuste
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3. INSPECTION/ADJUSTMENT
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Unscrew (3) the clamp (5) and remove the air cleaner assembly (4) from the air cleaner housing.
MXU 250
Remove the screw and remove the air cleaner assembly from the air cleaner holder.
Remove the air cleaner and air cleaner screen from the air cleaner body. Remove the air cleaner net from the air cleaner.
Screw Air Cleaner Holde
Air Cleane
Reassemble by reversing the disassembly sequence.
Air Cleaner screen
Air Cleaner body
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3. INSPECTION/ADJUSTMENT
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CLEAN AIR FILTER ELEMENT
Wash the element gently, but throughly in solvent.
Use parts cleaning solvent only. Neve use gasoline or low flash point solvents which may lead to a fire or explosion.
Squeeze the excess solvent out of the element and let dry.
Do not twist or wring out the foa element. This could damage the foam material.
Apply the engine oil. Squeeze out the excess oil.
The element should be wet but not dripping.
More frequent replacement is required when riding in unusually dusty or rainy areas.
MXU 250
AIR CLEANER HOUSING DRAIN
Remove the drain tube (under air cleaner case) by removing the clip. Drain the deposits.
Reinstall the drain tube, securing it with the clip.
AIR FILTER FOR DRIVE BELT
To clean the air filter: Remove front center cover. (See page 2-7) Remove air filter. Tap the element lightly to remove most of the dust and dirt. Blow out the remaining dirt with compressed air.
Drain Tube
Air Cleaner Housing
Clip
Installation is in the reverse order of removal.
If necessary replace the air filter.
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Air Filte
3. INSPECTION/ADJUSTMENT
MXU 250
SECONDARY AIR SUPPLY SYSTEM
This model is equipped with a built-in secondary air supply system. The pulse secondary air supply system is located on the cylinder head cover.
The secondary air supply system introduces filtered air into exhaust gases in the exhaust port. The secondary air is drawn into the exhaust port whenever there is negative pressure pulse in the exhaust system. This charged secondary air promotes burning of the unburned exhaust gases and changes a considerable amount of hydrocarbons and carbon monoxide into relatively harmless carbon dioxide and water.
Check the PAIR (pulse secondary air injection) hoses between the PAIR control solenoid valve and cylinder head cover for deterioration, damage or loose connections. Make sure the hoses are not cracked.
If the hoses show any signs of heat damage, inspect the PAIR check valve in the PAIR reed valve cover damage.
Vacuum Hose
PAIR Control solenoid Valve
Air Supply HosePAIR Check Valve
SPARK PLUG
Remove ignition coil cap and spark plug. Check the spark plug for wear and fouling deposits. Clean any fouling deposits with a spark plug cleaner or a wire brush.
Specified Spark Plug: DPR7EA-9
Ignition Coil Cap
Spark Plug
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3. INSPECTION/ADJUSTMENT
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MXU 250
Measure the spark plug gap. Spark Plug Gap: 0.60.7 mm (0.002
0.003 in)
When installing, first screw in the spar plug by hand and then tighten it with a spark plug wrench.
VALVE CLEARANCE
Inspect and adjust valve clearance while the engine is cold (below 35℃).
Gap, Wear, and Fouling Deposits
Washer Deformation
Cylinder Head Cove
Cracks, Damage
Remove the cylinder head cover. (See chapter 7)
Turn the flywheel clockwise so that the “T” mark on the flywheel aligns with the index mark on the right crankcase cover to bring the round hole on the camshaft gear facing up to the top dead center on the compression stroke.
Inspect and adjust the valve clearance. Valve Clearance: IN: 0.1 mm (0.004 in) EX: 0.1 mm (0.004 in)
“T” MarkIndex Mark
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