SKU 66753
for technical questions, please call 1-800-444-3353.
Page 20
troubleshooting (continued)
problem
possible Causes
probable solutions
Engine misfires
Spark plug wire loose.
1.
Incorrect spark plug gap or
2.
damaged spark plug.
Defective spark plug wire.
3.
Old or low quality gasoline.
4.
Check wire connections.
1.
Re-gap or replace spark plug.
2.
Replace spark plug wire.
3.
Use only fresh 90+ octane unleaded
4.
gasoline, 40:1 mixture with 2-stroke
engine oil.
engine stops
suddenly
Fuel tank empty or full of impure or
1.
low quality gasoline.
Defective fuel tank cap creating
2.
vacuum, preventing proper fuel flow.
Improper idle speed.
3.
Faulty magneto, incorrect timing, or
4.
clogged carburetor.
Fill fuel tank with fresh 90+ octane
1.
unleaded gasoline in 40:1 mixture
with 2-stroke engine oil.
Test/replace fuel tank cap.
2.
Properly adjust idle speed.
3.
Have qualified technician diagnose
4.
and service engine.
engine knocks
Old or low quality gasoline.
1.
Engine overloaded.
2.
Incorrect spark timing, deposit
3.
buildup, worn engine, or other
mechanical problems.
Empty fuel tank and re-fill with fresh
1.
90+ octane unleaded gasoline, 40:1
mixture with 2-stroke engine oil.
Do not exceed equipment’s load
2.
rating.
Have qualified technician diagnose
3.
and service engine.
Engine backfires
Impure or low quality gasoline.
1.
Choke not open after engine warm.
2.
Engine not properly adjusted for
3.
high altitude operation.
Intake valve stuck, choke stuck,
4.
incorrect timing, clogged carburetor,
or overheated engine.
Fill fuel tank with fresh 90+ octane
1.
unleaded gasoline, 40:1 mixture
with 2-stroke engine oil.
Move choke to RUN position after
2.
engine warms up.
Qualified technician must adjust
3.
engine at altitudes greater than
5,000 feet above sea level.
Have qualified technician diagnose
4.
and service engine.
saw blade not
rotating up to full
speed.
Improper fuel mixture.
1.
Belt too tight or too loose.
2.
Air filter needs cleaning or changing.
3.
Check that fuel mixture is accurate.
1.
Adjust belt.
2.
Check air filter and clean or replace.
3.
poor quality of
cut.
Blade improperly installed.
1.
Blade worn or damaged.
2.
Make sure Saw Blade is properly
1.
installed.
Replace worn or damaged Blade.
2.
follow all safety precautions whenever diagnosing or servicing the
equipment or engine.