Briggs & Stratton Vanguard Single Cylinder OHV Air-Cooled Engines Service Repair Manual

Briggs & Stratton VANGUARD ™ SINGLE CYLINDER OHV AIR-COOLED ENGINES Quality Starts With A Master Service Technician 272147 - Vanguard Single Cylinder OHV Air-Cooled Engines 272144 - Vanguard Twin Cylinder OHV Air-Cooled Engines 275429 - Vanguard Twin Cylinder OHV Liquid-Cooled Engines MS-0750 - Vanguard 3-Cylinder OHV Liquid-Cooled Gasoline Engines MS-1055 - Vanguard 3-Cylinder OHV Liquid-Cooled Diesel Engines Other Briggs & Stratton Commercial Power Repair Manuals: Vanguard Single Cylinder OHV Air-Cooled Engines ™ POST OFFICE BOX 702 MILWAUKEE, WI 53201 USA BRIGGSandSTRATTON.COM ©2007 Briggs & Stratton Corporation BRIGGS&STRATTON CORPORATION Part No. 272147-1/07

7 1 2 3 4 5 6 8 9 10 11 12 13 14 SECTION 1- Safety, Maintenance & Adjustments SECTION 2 -Troubleshooting SECTION 3 - Engine Disassembly SECTION 5 - Fuel Systems & Carburetion SECTION 6 - Governor Systems SECTION 7- Cylinder Heads & Valves SECTION 8 - Starters SECTION 9 - Lubrication Systems SECTION 10 - Cylinders, Covers & Sumps SECTION 11 - Crankshafts, Camshafts, Balancing Systems & Gear Reductions SECTION 12 - Pistons, Rings & Connecting Rods SECTION 13 - Final Engine Assembly SECTION 14 - Engine Specifications & Reference Tables SECTION 4 - Exhaust Systems

FORWARD This guide has been written and published by Briggs & Stratton Corporation to aid our dealers' mechanics and company service personnel when servicing the products described herein. It is assumed that these personnel are familiar with the servicing procedures for these products, or like or similar products, manufactured by Briggs & Stratton Corporation. It is also assumed that they have been trained in the recommended servicing procedures for these products, which includes the use of mechanics hand tools and any special tools that might be required. Proper service and repair is important to the safe, econo mical and reliab le operation of all engines and engine driven systems. The troubleshooting, testing, service and repair procedures described in this guide are effective methods of performing such operations. We could not possibly know of and advise the service trade of all conceivable procedures or methods by which a service might be performed, nor of every possible hazards and/or results of each procedure or method. We have not undertaken any such wide evaluation. Therefore, an yone who uses a procedure or method not described by the manufacturer must first satisfy himself that neither his safety, nor the safety of the product, will be endangered by the service or operating procedure selected. All information, illustrations, and specifications contained in this guide are based on the latest production information available at the time of publication. However, Briggs & Stratton Corporation reserves the right to change, alter, or otherwise improve the product at any time without prior notice. Some compone nts or assemblies of the product described in this guide may not be considered repairable. Disassembly, repair and reassembly of such components may not be included in this guide. Copyright © 2008 Briggs & Stratton Corporation All rights reserved. No part of this material may be reproduce d or transmitted, in any form or by any means, electronic or mechanical, including photocopying, recording or by any information storage and retrieval system, without prior permission in writing from Briggs & Stratto n Corporation.

3 1 SECTION 1 - SAFETY, MAINTENANCE AND ADJUSTMENTS ENGINE SAFETY ................................................................................. 5 In The Interest Of Safety ..................................................... 5 The Safety Alert Symbol ....................................................................... 5 Additional Precautions .......................................................................... 8 BRIGGS & STRATTON NUMERICAL IDENTIFICATION SYSTEM ..... 9 ENGINE MAINTENANCE ................................................................... 10 Fuel and Oil Recommendations.......................................................... 10 Changing Oil ....................................................................................... 11 MAINTENANCE SCHEDULE ............................................................. 12 Air Cleaner Service............................................................................. 13 In-Line Fuel Filter Service ................................................................... 15 ENGINE ADJUSTMENTS .................................................................. 15 Armature Air Gap Adjustments ........................................................... 15 Carburetor Idle-Mixture Adjustments .................................................. 15 Control Adjustments ........................................................................... 16 Cooling System Maintenance ............................................................. 18 Flywheel Brake Adjustments (104700) ............................................... 19 Governor Adjustments ........................................................................ 19 Electro-Magnetic Idle Down Adjustments ........................................... 25 Spark Plug Maintenance..................................................................... 26 Valve Clearance Adjustments............................................................. 26 Combustion Chamber Deposits ......................................................... 27

5 1 ENGINE SAFETY In The Interest Of Safety This repair manual contains safety information that is designed to: • Make you aware of hazards associated with engines. • Inform you of the risk of injury associated with those hazards. • Tell you how to avoid or reduce the risk of injury. The Safety Alert Symbol The safety alert symbol ( ) is used to identify safety information about hazards that can result in personal injury. A signal word ( DANGER, WARNING, or CAUTION) is used with the alert symbol to indicate the likelihood and the potential severity of injury. In addition, a hazard symbol may be used to represent the type of hazard. DANGER indicates a hazard which, if not avoided, will result in death or serious injury. WARNING indicates a hazard which, if not avoided, could result in death or serious injury. CAUTION indicates a hazard which, if not avoided, might result in minor or moderate injury. CAUTION: When this signal word is used without the alert symbol, it indicates a situation that could result in damage to the engine. • Prior to work, read and understand the section(s) of this manual that pertain to the job. Follow all safety warnings. • Wear suitable eye protection. • When servicing engines or equipment, prevent accidental starting by removing the spark plug wire from the spark plug(s). • Disconnect negative battery terminal if the application is equipped with an electric starting system. • Periodically clean engine. Keep governor parts free of dirt, grass and other debris which can affect engine speed and cooling. • Always use fresh gasoline. Stale fuel can cause gum deposits in the carburetor and cause leakage, flow restrictions or other failures. • Check fuel lines and fittings frequent ly for cracks or leaks and replace if necessary. WARNING Before attempting to service this equipment, read and understand thi s manual and the operating instructio ns of the equipment it powers. Failure to FOLLOW instructions could result in DEATH, SERIOUS INJURY (includi ng paralysis) or property damage. WARNING Briggs & Stratton does not approve or authorize the use of these engines on 3- wheel All Terrain Vehicles (ATV’s), motorbikes, fun/recreational ve hicles for use in competitive events. Use of these engines is such applications could result in property damage, serious injury (i ncluding paralysis), or even death.

6 1 HAZARD SYMBOLS AND MEANINGS Explosion Fire Shock Goggles Chemical Explosive Burns Pressure Kick Hot Entanglement Back Surface Toxic Read Disconnect Fumes Spark Plug WARNING The engine exhaust from th is product contains chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. WARNING Gasoline and its vapors are extremely flammable and explosive. Fire or explosion can cause severe burns or death. When adding fuel: • Turn engine OFF and let engine cool at least 2 minutes before filling or refillin g. • Fill fuel tank outdoors or in a well- ventilated area. • Do not overfill fuel tank. Fill tank to approximately 1-1/2 inches below top of neck to allow for fuel expansion. • Keep gasoline away from sparks, open flames, pilot lights, heat and other ignition sources. • Check fuel lines, tank, cap and fittings frequently for cracks or leaks and replace if necessary. When starting engine: • Make sure spark plug, muffler, fuel cap and air cleaner are in place. • Do not crank engine with spark plug removed. • If fuel spills, wait until it evaporates before starting engine. • If engine floods, set choke to OPEN/RUN position. Place throttle in FAST and crank until engine starts. When operating equipment: • Do not tip engine or equipment at an angle which would cause fuel to spill. • Do not choke carburetor to stop engine. When transporting equipment: • Transport with fuel tank empty or with fuel shut-off valve set to OFF. When storing gasoline or equipment with fuel in tank: • Store away from furnaces, sto ves, water heaters or other appliances that have a pilot light or other ignition source because they can ignite gasoline vapors.

7 1 DANGER Running engines produce heat. Temperature of muffler and surrounding areas can exceed 150°F (65°C). Severe burns can occur on contact. • Allow muffle r, en gine cylinder fins and radiator to cool before touching. • Remove accumulated combustibles from muffler area and cylind er area. • Install and maintain in working order a spark arrestor before using equipment on forest-covered, brush-covered unimproved land. The state of California requires this (Section 4442 of the Public Resources Code). Other states may have similar laws. Federal laws apply on federal land. WARNING Unintentional sparking can result in fire or electric shock. Unintentional start-up can result in entanglement, traumatic amputation or severe lacerations. Before performing adjustments or repairs: • Disconnec t spark plug wire and keep it away from spark plug. • Disconnect negative (-) battery termin al. When testing for spa rk: • Use approved spark plug tester. • Do not check for spark with spark plug removed. DANGER Engines give off carbon mono xide, an odorless, colorless, poison gas. Breathing carbon monoxide can cause nausea, fainting or death. • Start and run engine outdoors. • Do not start or run engine in an enclosed area, even if doors and windows are open. DANGER Starting engine creates sparking. Sparking can ignite nearby flammable gases. Explosion and fire could resu lt. • If there is a natural or LP gas leakage in the area, do not start engine. • Do not use pressurized starting fluids because vapors are flammable. DANGER Rotating parts can contact or entangle hands, feet, hair, clothing or ac cessories. Traumatic amputation or severe lacerations can result. • Operate equipment with gua rds in place. • Keep hands and feet away from rotating parts. • Tie up long hair and remove jewe lry. • Do not wear loose-fitting clothing, dangling drawstrings or items that could become entangled in the equipm ent.

8 1 WARNING Kerosene and its vapors are extremely flammable and should be handle d with t he same precautions as gasoline. DANGER Broken bones, fractures, bruises or sprains could result. • Remove all external equipment/engi ne loads before starting engine. • Direct-coupled equipment components such as, but not limited to blades, impellers, pulleys and sprockets must be securely attached. WARNING All fuel compo nents should b e in good conditio n and properly maintai ned. • Repairs should only be made with factory approved parts. • Repair work should be done by a qualified technician. • Flexible supply lines should be checked regularly to make sure they are in good condition. WARNING Charging batteries produces hydrogen gas. Do not store or charge and battery near an open flame or devices that utilize a pilot light or can create a spark.

9 1 BRIGGS & STRATTON NUMERICAL IDENTIFICATION SYSTEM

Briggs & Stratton Vanguard Single Cylinder OHV Air-Cooled Engines Service Repair Manual

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