N ep o ro t fo du r ct io n R Briggsracing.
Version 4/08 N ep o ro t fo du r ct io n Racing Performance Catalog & Reference Guide R Model/Type: 124435 8105-01
Table of Contents SAFETY..................................................................................................1 WORLD FORMULA General Specs.......................................................................................3 Special Tools..........................................................................................3 Torque Specs.........................................................................................3 Racing Specifics................................................
N ep o ro t fo du r ct io n R SAFETY SAFETY 1
R N ep o ro t fo du r ct io n SAFETY 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.
WORLD FORMULA Installing Cylinder Head Plate GENERAL SPECS world formula ENGINES Torque to 90 - 120 in-lbs. (10 - 14 Nm) Model: 124335 Type: 8105 Displacement: 12.48 Cu. in. - 206 cc Design: Slant, 30 degree, Overhead Valve, Electric Start Bore: 2.6875/2.6885 in. Stroke: 2.2 in. Compression Ratio: 9.5 to 1 Factory Timing: 29 degrees BTDC Torque to 70 - 90 in-lbs. (7.9 - 10.1 Nm) SPECIAL TOOL REQUIREMENTS General Model 12 Manual Part No. 272147 PVL Flywheel Puller Part No.
WORLD FORMULA cylinder assembly (Engine Model Series 124335) 272147 Repair Manual 555664 Ring Set 55513 Ring Set 557122 Piston Assembly 555665 Ring Set 55514 Ring Set 557123 Piston Assembly 555666 Ring Set 55515 Ring Set 557124 Piston Assembly 555667 Ring Set (Std., with File to fit Top Ring) (Std.) (.10" Over, with File to fit Top Ring) (.10" Over) (.20" Over, with File to fit Top Ring) (.20" Over) (.30" Over, with File to fit Top Ring) (.30" Over) (.10" Over - Contains 10 Top Rings) (.
WORLD FORMULA head assembly (Engine Model Series 124335) 699481 Hex Washer Head Metric Screw (Rocker Cover Top & Sides) (Rocker Cover Bottom) 555679 Rocker Cover world formula ENGINES 692557 Hex Washer Head Screw 691890 Rocker Cover Gasket* 557045 Exhaust Manifold 691764 Hose Connector 694543 Rocker Arm Adjuster* 557015 Rocker Arm* 694544 Rocker Arm Stud* 699230 Hex Washer Head Metric Screw (Cylinder Head Plate) 557025 Valve Retainer* 557024 Valve Spring* 557047 Exhaust Gasket N ep o ro t fo du
WORLD FORMULA housing & flywheel (Engine Model Series 124335) world formula ENGINES 555577 Label Kit 557125 Magneto Armature 557128 Starter Ring Gear (Includes 4 Pcs. 557129 - Screw) 699477 Metric Screw (Magneto Armature) 698039 Starter Drive Cover (Used on Type No.
WORLD FORMULA carburetor assembly world formula ENGINES (Engine Model Series 124335) 557081 Needle Jet 555647 Throttle Cable Boot 555650 Needle Valve Retainer (Contains 5 Clips & 5 Retainers) 557083 Throttle Valve 698973 Air Cleaner 557096 Air Cleaner 557088 Throttle Cable Cap (Water Repellent Cover, Optional) 690939 Nut+ (Carburetor) 557007 O-Ring Seal* N ep o ro t fo du r ct io n 557087 Throttle Return Spring 555586 Idle Speed Kit Pilot Jet 557130 Carburetor Spacer+ 557086 Emulsion Tube 5
WORLD FORMULA clutch (Engine Model Series 124335) world formula ENGINES 557023 Centrifugal Clutch Assembly (Does not contain Radius Washer 2400025) 557115 Snap Ring 557116 Cartridge Springs Kit N ep o ro t fo du r ct io n (Includes 3 Orange & 3 Yellow) 557114 Clutch Cartridge (Includes Springs) 557111 Clutch Drum 557112 Clutch Hub Shaft 557113 Clutch Thrust Spacer/Bearing R 557115 Snap Ring 557019 Mounting Hardware 2400025 Raduis Washer (Required for inboard mounting, included with Clutch Ass
WORLD FORMULA starter assembly world formula ENGINES (Engine Model Series 124335) *Included with 557068 Starter Assembly +Included with 557073 Brush Retainer 557120 Screw 690323 Screw* (Support Bracket) (Starter Motor) 557119 Support Bracket (Starter) 691532 Starter Strap N ep o ro t fo du r ct io n 691286 End Cap* 691293 Brush Retainer* 497608 Brush Set*+ 690635 Clamp (Starter Solenoid) 557072 Starter Housing* 691029 Nut*+ (Brush Retainer) 692966 Starter Armature* 691261 Washer*+ (Brush Re
WORLD FORMULA control bracket & gasket set (Engine Model Series 124335) world formula ENGINES 808656 Fuel Pump 793379 Stop Wire (Used on Type No.(s) 8104, 8105, 8106) 692602 Stop Wire (Rocker Switch, Used on Type No.
PZ26 Carburetor Tuning Guide world formula ENGINES If a smooth idle cannot be obtained with the Idle Mixture screw between 1/4 - 2 turns out from closed, a different size Pilot Jet may be needed. The proper size Pilot Jet will allow for smooth acceleration from an idle and steady engine speed up to 1/4 throttle opening. Midrange / Part Throttle The Jet Needle primarily controls fuel flow between 1/4 and 3/4 throttle opening. The Jet Needle has five notches and a C-clip on the top of it.
WORLD FORMULA electric starting system (Engine Model Series 124335) world formula ENGINES R N ep o ro t fo du r ct io n Electric Start Wiring Diagram 12
Log Book WORK PERFORMED 1/31/08 example: Replaced Air Cleaner SEAL NUMBER WORK PERFORMED BY DK R N ep o ro t fo du r ct io n DATE 13
