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Poor Compression Leaking cylinder head gasket Replace per instructions in manufacturer’s manual
Incorrect tappet adjustment Adjust per instructions in manufacturer’s manual
Sticking valves Repair per instructions in manufacturer’s manual
Worn cylinder bores Repair per instructions in manufacturer’s manual
Pitted valves and seats Repair per instructions in manufacturer’s manual
Broken, worn, or sticking piston ring(s) Repair per instructions in manufacturer’s manual
Worn valve stems and guides Repair per instructions in manufacturer’s manual
Broken valve spring Replace per instructions in manufacturer’s manual
Starts and Stops Restriction in air cleaner Remove obstruction
Fuel tank empty Fill tank
Choked fuel filter Remove obstruction
Bad spark plugs Replace spark plugs; see manufacturer’s manual
for recommendations
Vibration Poor compression Repair per instructions in manufacturer’s manual
Sticking throttle/restricted movement Lubricate or replace
Leaking cylinder head gasket Replace per instructions in manufacturer’s manual
Overheating Allow to cool; determine cause
Sticking valves Repair per instructions in manufacturer’s manual
Broken, worn, or sticking piston rings Repair per instructions in manufacturer’s manual
Incorrectly aligned flywheel and/or
flywheel housing
Adjust per instructions in manufacturer’s manual
Will Not Crank Bad electrical connection Check connections to electric start (if applicable)
Will Not Start Restriction in air cleaner Remove obstruction
Choked fuel filter Remove obstruction
Bad spark plugs Replace spark plugs; see manufacturer’s manual
for recommendations
ENGINE TROUBLESHOOTING
PROBLEM PROBABLE CAUSE CORRECTION