RULES FOR SAFE OPERATION
4-CYCLE ENGINE THEORY
SECTION 1: GENERAL INFORMATION
SECTION 2: IGNITION
SECTION 3: AIR INTAKE SYSTEM AND CARBURETION
SECTION 4: MECHANICAL GOVERNOR
SECTION 5: OPTIONAL IDLE CONTROL
SECTION 6: CYLINDER HEAD AND VALVES
SECTION 7: REWIND STARTERS
SECTION 8: ELECTRIC STARTERS AND BATTERIES
SECTION 9: LUBRICATION SYSTEM
SECTION 10: HOUSING AND SHROUDS
SECTION 11: CRANKSHAFT, CAMSHAFT AND BALANCER
SECTION 12: PISTON, RINGS AND ROD
SECTION 13: TROUBLESHOOTING
SECTION 14: SPECIFICATIONS - SMALL FRAME ENGINES
SECTION 15: SPECIFICATIONS - LARGE FRAME ENGINES
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TABLE OF CONTENTS
A WORD ABOUT SPECIAL TOOLS
Many of the procedures depicted in this manual require the use of special tools. Some of
the tools required are available as Generac parts and are listed as such in this manual.
ATTENTION!
Generac Power Systems does not approve or authorize the use of these engines on All Terrain Vehicles
(ATV’s), go-carts, motorbikes, aircraft products, personal watercraft, or vehicles intended for use in
competitive events. The use of this product in any other than it’s intended application will void the
warranty! Use of these engines in such applications could result in property damage, serious injury
(including paralysis), or even death.
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