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Briggs & Stratton
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124335
User Manual
28 pgs4.06 Mb0

Briggs & Stratton 124335 User Manual

Version 7/10
Not for
Reproduction
Not for
Reproduction
Racing Performance Catalog & Reference Guide
Model/Type: 124335 8105-01 (International)
124335 8104-01 (US Standard)
TABLE OF CONTENTS
Not for
Reproduction
Not for
Reproduction
WORLD FORMULA
English Spanish French
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CONGRATULATIONS on your purchase of a Briggs & Stratton World Formula Racing Engine. This engine has been designed for sanctioned racing only and for use at only sanctioned tracks. It is vital for the longevity and dependability of this product that you read the following, as the initial usage of this engine will affect its life overall.
WE RECOMMEND that all modifications and setup of this engine be done by a reputable source of supply with the proper knowledge needed to work on a racing engine.
SAFETY
Not for
Reproduction
Not for
Reproduction
SAFETY
1
SAFETY
Not for
Reproduction
Not for
Reproduction
BRIGGS & STRATTON DOES NOT APPROVE OR AUTHORIZE THE USE OF THESE ENGINES ON 3 WHEEL ALL TERRAIN VEHICLES (ATVS), MOTOR BIKES, FUN/RECREATIONAL GO-KARTS, OR AIRCRAFT PRODUCTS. USE OF THESE ENGINES IN SUCH APPLICATIONS COULD RESULT IN PROPERTY DAMAGE, SERIOUS INJURY (INCLUDING PARALYSIS), OR EVEN DEATH. THIS ENGINE REQUIRES SPECIAL TECHNICAL EXPERTISE AND PREPARATION BEFORE IT CAN BE USED IN COMPETITIVE EVENTS.
2
WORLD FORMULA
Not for
Reproduction
Not for
Reproduction
GENERAL SPECS
Model: 124335 Type: 8104/8105 Displacement:
12.48 Cu. in. - 205 cc Design: Slant, 30 degree, Overhead Valve, Electric Start Bore: 2.6875/2.6885 in. (68.3mm) Stroke: 2.2 in. (55.9mm) Compression Ratio: 9.5 to 1
Factory Timing: 29 degrees BTDC
SPECIAL TOOL REQUIREMENTS
General Model 12 Manual Part No. 272147 PVL Flywheel Puller Part No. 19584 Flywheel Wrench Part No. 19433
Installing Cylinder Head Plate
Torque to 90 - 120 in-lbs. (10 - 14 Nm)
Torque to 70 - 90 in-lbs. (7.9 - 10.1 Nm)
TORQUE SPECS
Description Wrench/socket size torque
Air Guard 7mm 40-50 lb-in. (4.5-5.6 Nm) Blower Housing 10mm & 3/8" 60-110 lb-in. (7-12.5 Nm) Carburetor (to manifold) 10mm 80-110 lb-in. (9-12.4 Nm) Connecting Rod T27 140-150 lb-in. (16-17 Nm) Cylinder Head Bolts 10mm 200-220 lb-in. (20-27 Nm) Exhaust Brace Screws 10mm 95-125 lb-in. (11-14 Nm) Exhaust Stud 10mm 95-125 lb-in. (11-14 Nm) Flywheel Nut 15/16 55-75 ft-lbs. (74.5-101 Nm) Flywheel Fan 10mm 180-240 lb-in. (20-27 Nm) Intake (to cylinder) 5mm Allen 70-90 lb-in. (8-10.2 Nm) Oil Drain Plug 3/8" 100-125 lb-in. (11-14 Nm) PVL Module 7mm 20-35 lb-in. (2.3-4 Nm) Rocker Arm Stud 7/16" 90-120 lb-in. (10-14 Nm) Rocker Arm Plate 10mm 70-90 lb-in. (7.9-10.1 Nm) Rocker Arm Set Screw 1/8" Allen 50-70 lb-in (5.6-7.9 Nm) Spark Plug 5/8" Deep 95-145 lb-in. (11-16.4 Nm) Side Cover 10mm 95-125 lb-in. (11-14 Nm) Starter Gear #2 Phillips 35-53 lb-in. (4-6 Nm) Top Control Plate 10mm 70-90 lb-in. (8-10 Nm) Valve Cover 10mm Lower & 3/8" 30-60 lb-in. (3.5-7 Nm)
RACING SPECIFICS
PVL™ Ignition Module Gap - .010/.014 (.15/.36mm) Digital Rev Limiter - 7,000 RPM +/- 50 Spark Plug - Champion™ RG4HC Fuel Requirements - 98 Octane (RON) Recommended Oil Capacity – 14-16 oz. of kart racing specific oil. We no longer recommend using automotive oil beyond break-in due to recent domestic and international changes that could adversely affect product life. Exhaust System Requirements-50mm x 57mm Flex Coupling, 50/90 Canister Muffler. Starter System-12 Volts @ 20 Amp Capacity-180 Cold Cranking amps. Refer to your sanctioning body rules for required installation location.
OPTIONAL PERFORMANCE PARTS
High - G/Force Breather Bypass System - Part No. 555688 Fuel Filter - Part No. Drain Plug - Part No.
Adjusting Valve Clearance
WORLD FORMULA ENGINES
Torque to 50 - 70 in-lbs. (6 - 8 Nm)
Feeler Gauge
HIGHLIGHTED FEATURES
· Dual Ball-Bearing, RACING Reinforced Cylinder
· Billet Rod
· Slotted, Stelite-Faced, Ground Cam w/ Compression Release
· Dual, High-Silicon Valve Springs
· PVL™ Digital Ignition System w/ 7,100 RPM Limiter
· CNC D-Shape Intake Port
· Walbro™ Round-Slide Carburetor
· Dana™ Fire-Ring Head Gasket
· Racing Crankshaft w/ Induction-Hardened Crankpin
· Green™ Air Filter
· Federal Mogul™ Moly-Coated Cam Ground, Barrel-Faced Piston
· Chrome-Faced, Racing Only Ring Package
· Port-Liner, Exhaust System
· Mikuni™ Fuel Pump
· Noram™ Clutch w/ Quick Change Sprocket Set
· Automotive 3-Piece Valve Retainer System
· Beefy Rocker Arm Stud Nuts
3
WORLD FORMULA cylinder assembly
Not for
Reproduction
Not for
Reproduction
(Engine Model Series 124335)
WORLD FORMULA ENGINES
272147 Repair Manual
555688 Breather Assembly
(Optional, Also includes 691890 Rocker Cover Gasket)
699485 Crankcase Gasket•
691664 Screw
(Connecting Rod)
555680 Cylinder Shield
699483 Metric Screw
(Cylinder Shield)
557137 Crankshaft
557117 Connecting Rod
557121 Piston Assembly
(Std., with File to t Top Ring)
557122 Piston Assembly
(.10" Over, with File to t Top Ring)
557123 Piston Assembly
(.20" Over, with File to t Top Ring)
557124 Piston Assembly
(.30" Over, with File to t Top Ring)
555664 Ring Set
(Std.)
555665 Ring Set
(.10" Over)
555666 Ring Set
(.20" Over)
555667 Ring Set
(.30" Over)
555140 Bushing/Seal Kit
692600 Breather Tube
55513 Ring Set
(.10" Over - Contains 10 Top Rings)
55514 Ring Set
(.20" Over - Contains 10 Top Rings)
55515 Ring Set
(.30" Over - Contains 10 Top Rings)
699359 Flywheel Nut†
299819s Oil Seal
(Magneto Side)
695087 Timing Gear†
692517 Bearing•
281658 Oil Fill Cap•
692550 Oil Seal•
(PTO Side)
699478 Screw
(Crankcase Cover/Sump - M7x1)
555652 Crankshaft Endplay Shim
(Contains (4) .005, (1) .015)
281658s Oil Fill Cap•
555630 Crankcase Cover
691686 Oil Drain Plug*
(Magnetic, Optional)
555705 Cylinder Assembly
690959 Locating Pin*
698024 Ball Bearing†
222698S Flywheel Key
557117 Connecting Rod
499423 Piston Pin
691866 Piston Pin Lock
690979 Woodruff Key†
557041 Camshaft
*Included with 555705 Cylinder Assembly
(Includes all parts shown)
Included with Respective Piston Assembly
(Includes all parts shown)
† Included with 557137 Crankshaft
Included with 555520 Piston Pin
• Included with 555630 Crankcase Cover
4
WORLD FORMULA head assembly
Not for
Reproduction
Not for
Reproduction
(Engine Model Series 124335)
692557 Hex Washer Head Screw
(Rocker Cover Top & Sides - 1/4”-20 UNC)
699230 Hex Washer Head Metric Screw
(Rocker Cover Bottom)
555679 Rocker Cover
691890 Rocker Cover Gasket*
691764 Hose Connector
694543 Rocker Arm Adjuster*
694544 Rocker Arm Stud*
699230 Hex Washer Head Metric Screw
(Cylinder Head Plate)
691343 Push Rod Guide*
698214 Cylinder Head Plate*
694088 Cylinder Head
Plate Gasket*
699482 Hex Washer Head Metric Screw*
(Cylinder Head - M8 x 1.25)
557108 Stud
(Intake Manifold)
557015 Rocker Arm*
557016 Valve Cap*
557025 Valve Retainer*
557024 Valve Spring*
(Intake & Exhaust)
557026 Retaining Ring*
(Exhaust)
555645 Replacement Valve Guide Bearing*
(.002 Over)
555690 Heat Disperser (Optional)
557133 Cylinder Head Assembly
557045 Exhaust Manifold
557047 Exhaust Gasket
WORLD FORMULA ENGINES
557099 Washer
(Exhaust Manifold)
557097 Stud (Exhaust Manifold)
557039 Spark Plug
555646 Nut*
(Intake Manifold)
557099 Washer*
(Intake Manifold)
693517 Push Rod
557098 Valve Tappet
*Included with 557133 Cylinder Head Assembly
555698 Cylinder Head Gasket*
557017 Intake Valve*
557018 Exhaust Valve*
5
WORLD FORMULA housing & flywheel
Not for
Reproduction
Not for
Reproduction
(Engine Model Series 124335)
WORLD FORMULA ENGINES
695630 Stop Wire
(Used on Type No. 8105 & 8105)
557134 Blower Housing
794451 Hex Washer Head Metric Screw
(Blower Housing - M6 x 1)
555577 Label Kit
699477 Metric Screw
(Magneto Armature)
557126 Flywheel Assembly
699201 Screw
(Flywheel Fan)
557125 Magneto Armature
557128 Starter Ring Gear
(Includes 4 Pcs. 557129 - Screw)
698039 Starter Drive Cover
699200 Screw
(Starter Drive Cover)
692592 Flywheel Fan
557107 Metric Screw
(Rewind)
555255 Rewind Guard
695287 Rewind Starter
699359 Hex Jam Nut
(Flywheel - M16 x 1.5)
699200 Hex Washer Head Screw
794451 Hex Washer Head Metric
(Blower Housing - 5/16 - 18unc)
692591 Flywheel Cup
555702 Cylinder Cover Insert
(Optional)
19433 Flywheel Wrench
19069 Flywheel Puller
19584 Flywheel Puller
(Optional)
6
WORLD FORMULA carburetor assembly
Not for
Reproduction
Not for
Reproduction
(Engine Model Series 124335)
555647 Throttle Cable Boot
557088 Throttle Cable Cap
557087 Throttle Return Spring
557007 O-Ring Seal*
557130 Carburetor Spacer+
555650 Needle Valve Retainer
(Contains 5 Clips & 5 Retainers)
690939 Nut+
(Carburetor)
555586 Idle Speed Kit
557081 Needle Jet
557083 Throttle Valve
698973 Air Cleaner
555255 Pilot Jet
557086 Emulsion Tube
557012 Main Jet
(Gasoline - Contains: 36 & 40 mm pilot jets: 90, 93, 98, 102, and 100 main jets)
557096 Air Cleaner
(Water Repellent Cover,
Optional)
WORLD FORMULA ENGINES
557131 Clamp
(Intake Manifold)
557084 Idle Mixture Kit
(Longer spring/needle)
557085 Idle Mixture kit
(Stock length)
557009 Intake Manifold
557044 Intake Gasket*
557082 Float Bowl Gasket*
555610 O-Ring Seal
557006 Carburetor Assembly
(Does not contain Carb Spacer, Clamp, Manifold, Gasket, Air Cleaner or Main Jet)
*557089 Carburetor Overhaul Kit
+555646 Metric Screw/Nut Kit (Carb to Spacer)
555648 Needle Float Valve
*
557080 Carburetor Float
100094 Air Cleaner Recharging Kit
(Optional)
557008 Float Bowl
(Includes Bowl Drain)
7
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