Harbor Freight Tools 67596 manual Use Engine will not start

Troubleshooting

Problem		Possible Causes		Probable Solutions
Engine misfires	1. Spark plug wire loose.		1.	Check wire connections.
	2.	Incorrect spark plug gap or	2.	Re-gap or replace spark plug.
		damaged spark plug.
	3.	Defective spark plug wire.	3.	Replace spark plug wire.
	4.	Old or low quality gasoline.	4.	Use only fresh 89+ octane unleaded
				gasoline.
	5.	Incorrect compression.	5.	Diagnose and repair compression.
				(Use Engine will not start:
				Compression Related
				section.)
Engine stops suddenly	1.	Low oil shutdown.	1.	Fill engine oil to proper level.
				Check engine oil before EVERY
				use.
	2.	Fuel tank empty or full of impure or	2.	Fill fuel tank with fresh 89+ octane
		low quality gasoline.		unleaded gasoline.
	3.	Defective fuel tank cap creating	3.	Test/replace fuel tank cap.
		vacuum, preventing proper fuel flow.
	4.	Faulty magneto.	4.	Have qualified technician service
				magneto.
Engine knocks	1.	Old or low quality gasoline.	1.	Fill fuel tank with fresh 89+ octane
				unleaded gasoline.
	2.	Engine overloaded.	2.	Do not exceed equipment’s load
				rating.
	3.	Incorrect spark timing, deposit	3.	Have qualified technician diagnose
		buildup, worn engine, or other		and service engine.
		mechanical problems.
Engine backfires	1.	Impure or low quality gasoline.	1.	Fill fuel tank with fresh 89+ octane
				unleaded gasoline.
	2.	Engine too cold.	2.	Use cold weather fuel and oil
				additives to prevent backfiring.
	3.	Intake valve stuck or overheated	3.	Have qualified technician diagnose
		engine.		and service engine.
Does not produce high	1. Diameter of water supply hose too		1.	Replace hose with a ¾ inch hose.
pressure		small
	2.	Water supply is restricted.	2.	Check water supply hose for kinks,
				leaks, or blockage.
	3.	Not enough water supply.	3.	Open water faucet all the way.

Follow all safety precautions whenever diagnosing or servicing the equipment or engine.

Page 22 For technical questions, please call 1-800-444-3353. SKU 67596