Engine Troubleshooting (cont.)

Problem

 

Possible Causes

 

Probable Solutions

Engine misfires

1. Spark plug cap 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 cap.

3.

Replace spark plug cap.

 

4.

Old or low quality gasoline.

4.

Use only fresh 87+ octane unleaded gasoline.

 

 

 

 

Do not use gasoline with more than

 

 

 

 

10% ethanol (E15, E20, E85, etc.).

 

5.

Incorrect compression.

5.

Diagnose and repair compression.

 

 

 

 

(Use Engine will not start:

 

 

 

 

Compression Related section.)

 

 

 

 

 

Engine stops

1.

Low oil shutdown.

1.

Fill engine oil to proper level. Check

suddenly

 

 

 

engine oil before EVERY use.

 

2.

Fuel tank empty or full of impure or low

2.

Fill fuel tank with fresh 87+ octane

 

 

quality gasoline.

 

unleaded gasoline.

 

 

 

 

Do not use gasoline with more than

 

 

 

 

10% ethanol (E15, E20, E85, etc.).

 

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.

 

5.

Disconnected or improperly

5.

Secure spark plug cap.

 

 

connected spark plug cap.

 

 

 

 

 

 

Engine stops when

1. Dirty air filter

1.

Clean or replace element.

under heavy load

2. Engine running cold.

2.

Allow engine to warm up prior

 

 

 

 

to operating equipment.

 

 

 

 

 

Engine knocks

1.

Old or low quality gasoline.

1.

Fill fuel tank with fresh 87+ octane

 

 

 

 

unleaded gasoline.

 

 

 

 

Do not use gasoline with more than

 

 

 

 

10% ethanol (E15, E20, E85, etc.).

 

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 87+ octane

 

 

 

 

unleaded gasoline.

 

 

 

 

Do not use gasoline with more than

 

 

 

 

10% ethanol (E15, E20, E85, etc.).

 

2.

Engine too cold.

2.

Use cold weather fuel and oil

 

 

 

 

additives to prevent backfiring.

 

3.

Intake valve stuck or overheated engine.

3.

Have qualified technician diagnose

 

 

 

 

and service engine.

 

4.

Incorrect timing.

4.

Check engine timing.

 

 

 

 

 

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

Item 68375

For Pump technical questions, please call 1-800-444-3353.

Page 17

 

For Engine technical questions, please call 1-800-520-0882.

 

Page 18 Page 20
Page 19
Image 19
Harbor Freight Tools 68375 manual Use Engine will not start, Compression Related section
Page 18 Page 20

68375 specifications

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