Harbor Freight Tools 62553 User Manual - Page 17
Problem, Possible Causes, Probable Solutions
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Problem Engine misfires Possible Causes 1. Spark plug cap loose. 2. Incorrect spark plug gap or damaged spark plug. 3. Defective spark plug cap. 4. Old or low quality gasoline. 5. Incorrect compression. Engine stops suddenly 1. Fuel tank empty or full of impure or low quality gasoline. 2. Low oil shutdown. Engine stops when under heavy load 3. Defective fuel tank cap creating vacuum, preventing proper fuel flow. 4. Faulty magneto. 5. Disconnected or improperly connected spark plug cap. 1. Dirty air filter 2. Engine running cold. Engine knocks 1. Old or low quality gasoline. Engine backfires 2. Engine overloaded. 3. Incorrect spark timing, deposit buildup, worn engine, or other mechanical problems. 1. Impure or low quality gasoline. 2. Engine too cold. 3. Intake valve stuck or overheated engine. After sudden impact, engine will run, but equipment will not operate 4. Incorrect timing. Shaft key or other shear pin broken by impact to disconnect engine and limit damage. Probable Solutions 1. Check cap and wire connections. 2. Re-gap or replace spark plug. 3. Replace spark plug cap. 4. Use only fresh 87+ octane stabilizer-treated unleaded gasoline. Do not use gasoline with more than 10% ethanol (E15, E20, E85, etc.). 5. Diagnose and repair compression. (Use Engine will not start: COMPRESSION RELATED section.) 1. Fill fuel tank with fresh 87+ octane stabilizertreated unleaded gasoline. Do not use gasoline with more than 10% ethanol (E15, E20, E85, etc.). 2. Fill engine oil to proper level. Check engine oil before EVERY use. 3. Test/replace fuel tank cap. 4. Have qualified technician service magneto. 5. Secure spark plug cap. 1. Clean element. 2. Allow engine to warm up prior to operating equipment. 1. Fill fuel tank with fresh 87+ octane stabilizertreated unleaded gasoline. Do not use gasoline with more than 10% ethanol (E15, E20, E85, etc.). 2. Do not exceed equipment's load rating. 3. Have qualified technician diagnose and service engine. 1. Fill fuel tank with fresh 87+ octane stabilizertreated unleaded gasoline. Do not use gasoline with more than 10% ethanol (E15, E20, E85, etc.). 2. Use cold weather fuel and oil additives to prevent backfiring. 3. Have qualified technician diagnose and service engine. 4. Check engine timing. Have qualified technician check and replace broken shaft key or other shear pins. Follow all safety precautions whenever diagnosing or servicing the equipment or engine.
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