Chicago Electric 66619 Operation And Service Instructions Manual page 18

Problem
Engine misfires
Engine stops
suddenly
Engine knocks
Engine backfires
Follow all safety precautions whenever diagnosing or servicing the
equipment or engine.
SKU 66619 For technical questions, please call 1-800-444-3353.
TRoUblEShooTING - ENGINE
Possible causes
1. Spark plug wire loose.
2. Incorrect spark plug gap or damaged
spark plug.
3. Defective spark plug wire.
4. Old or low quality gasoline.
5. Incorrect compression.
1. Fuel tank empty or full of impure or low
quality gasoline.
2. Defective fuel tank cap creating
vacuum, preventing proper fuel flow.
3. Improper idle speed.
4. Faulty magneto, incorrect timing, or
clogged carburetor.
1. Old or low quality gasoline.
2. Engine overloaded.
3. Incorrect spark timing, deposit buildup,
worn engine, or other mechanical
problems.
1. Impure or low quality gasoline.
1. Engine too cold.
2. Choke not open after engine warm.
3. Engine not properly adjusted for high
altitude operation.
4. Intake valve stuck, choke stuck,
incorrect timing, clogged carburetor, or
overheated engine.
Probable Solutions
1. Check wire connections.
2. Re-gap or replace spark plug.
3. Replace spark plug wire.
4. Use only fresh 89+ octane unleaded
gasoline and 2-cycle oil mixture.
5. Diagnose and repair compression. (Use
Engine will not start: coMPRESSIoN
RElATED section.)
1. Fill fuel tank with fresh 89+ octane
unleaded gasoline and 2-cycle oil
mixture.
2. Test/replace fuel tank cap.
3. Properly adjust idle speed.
4. Have qualified technician diagnose and
service engine.
1. Fill fuel tank with fresh 89+ octane
unleaded gasoline and 2-cycle oil
mixture.
2. Do not exceed equipment's load rating.
3. Have qualified technician diagnose and
service engine.
1. Fill fuel tank with fresh 89+ octane
unleaded gasoline and 2-cycle oil
mixture.
2. Use cold weather fuel and oil additives
to prevent backfiring.
3. Move choke to run position after engine
warms up.
4. Qualified technician must adjust engine
at altitudes greater than 5,000 feet
above sea level.
5. Have qualified technician diagnose and
service engine.
Page 18