Chicago Electric 66753 Set Up, Operating, And Servicing Instructions page 20

problem
Engine misfires
engine stops
suddenly
engine knocks
Engine backfires
saw blade not
rotating up to full
speed.
poor quality of
cut.
follow all safety precautions whenever diagnosing or servicing the
equipment or engine.
SKU 66753 for technical questions, please call 1-800-444-3353.
troubleshooting (continued)
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.
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.
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.
1. Improper fuel mixture.
2. Belt too tight or too loose.
3. Air filter needs cleaning or changing.
1. Blade improperly installed.
2. Blade worn or damaged.
probable solutions
1. Check wire connections.
2. Re-gap or replace spark plug.
3. Replace spark plug wire.
4. Use only fresh 90+ octane unleaded
gasoline, 40:1 mixture with 2-stroke
engine oil.
1. Fill fuel tank with fresh 90+ octane
unleaded gasoline in 40:1 mixture
with 2-stroke engine oil.
2. Test/replace fuel tank cap.
3. Properly adjust idle speed.
4. Have qualified technician diagnose
and service engine.
1. Empty fuel tank and re-fill with fresh
90+ octane unleaded gasoline, 40:1
mixture with 2-stroke engine oil.
2. Do not exceed equipment's load
rating.
3. Have qualified technician diagnose
and service engine.
1. Fill fuel tank with fresh 90+ octane
unleaded gasoline, 40:1 mixture
with 2-stroke engine oil.
2. Move choke to RUN position after
engine warms up.
3. Qualified technician must adjust
engine at altitudes greater than
5,000 feet above sea level.
4. Have qualified technician diagnose
and service engine.
1. Check that fuel mixture is accurate.
2. Adjust belt.
3. Check air filter and clean or replace.
1. Make sure Saw Blade is properly
installed.
2. Replace worn or damaged Blade.
Page 20