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Excessive Fuel
Consumption
Restriction in air cleaner Remove obstruction
Poor compression Repair per instructions in manufacturer’s manual
Incorrect grade of fuel Use fuel recommended in manufacturer’s manual
Sticking throttle/restricted movement Lubricate or replace
Leaking cylinder head gasket Repair per instructions in manufacturer’s manual
Worn oil pump Repair per instructions in manufacturer’s manual
Worn cylinder bores Repair per instructions in manufacturer’s manual
Pitted valve stems and seats Repair per instructions in manufacturer’s manual
Broken, worn, or sticking piston rings Repair per instructions in manufacturer’s manual
High Oil Pressure Incorrect grade of lubricating oil Use oil recommended in manufacturer’s manual
Pressure relief valve sticking closed Repair or replace spring
Knocking Incorrect grade of fuel Use fuel recommended in manufacturer’s manual
Overheating Allow to cool; determine cause
Sticking valves Repair per instructions in manufacturer’s manual
Worn cylinder bores Repair per instructions in manufacturer’s manual
Broken, worn, or sticking piston rings Repair per instructions in manufacturer’s manual
Worn or damaged bearings Repair per instructions in manufacturer’s manual
Incorrect piston height Adjust per instructions in manufacturer’s manual
Broken valve spring Replace per instructions in manufacturer’s manual
Loss of Power or System Restriction in air cleaner Remove obstruction
Blocked fuel feed line Remove obstruction
Choked fuel filter Remove obstruction
Poor compression Repair per instructions in manufacturer’s manual
Blocked fuel tank vent Remove obstruction
Incorrect grade of fuel Use fuel recommended 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
Worn cylinder bores Repair per instructions in manufacturer’s manual
Pitted valve stems and seats Repair per instructions in manufacturer’s manual
Broken, worn, or sticking piston rings Repair per instructions in manufacturer’s manual
Low Cranking Power Bad electrical connection Check connections to electric start (if applicable)
Faulty starter motor (if applicable) Replace per instructions in manufacturer’s manual
Incorrect grade of lubricating oil Use oil recommended in manufacturer’s manual
Low Oil Pressure Incorrect grade of lubricating oil Use oil recommended in manufacturer’s manual
Worn or damaged bearings Replace per instructions in manufacturer’s manual
Insufficient oil in sump Refill with oil
Oil pump worn Replace per instructions in manufacturer’s manual
Misfiring Choked fuel filter Remove obstruction
Poor compression Repair per instructions in manufacturer’s manual
Leaking cylinder head gasket Replace per instructions in manufacturer’s manual
Overheating Allow to cool; determine cause
Incorrect tappet adjustment Adjust per instructions in manufacturer’s manual
Sticking valves Repair per instructions in manufacturer’s manual
Pitted valves and seats Repair per instructions in manufacturer’s manual
Overheating Restriction in air cleaner Remove obstruction
Incorrect valve timing Adjust per instructions in manufacturer’s manual
Leaking cylinder head gasket Replace per instructions in manufacturer’s manual
ENGINE TROUBLESHOOTING
PROBLEM PROBABLE CAUSE CORRECTION