Service Manual

TROUBLESHOOTING CHART
The information gathered in preliminary troubleshooting can now be used with the following
troubleshooting chart to determine individual systems
to be serviced.
PROBLEM
Engine does not St;
Engine starts hard
or loses power.
Engine operates
eratically.
Engine idles poorly.
Engine skips at
high speed.
Engine overheats.
POSSIBLE CAUSES
~____________. ~-
1. Throttle not in CHOKE position.
2. Gas tank is empty.
3. Air cleaner element is
4. Spark plug is loose.
5. Spark plug wire is loose or
6. Spark plug gap is incorrect.
7. Spark plug is defective
8. Carburetor is flooded with gasoline.
dirty.
disconnected from spark plug.
9. Valves not closing.
1. Dirt, water or stale gas in fuel tank
2. Vent hole in fuel tank cap is plugged.
3. Air cleaner is dirty.
1. Spark plug is defective.
2. Spark plug gapped incorrectly.
3. Air cleaner is dirty.
~
1. Air cleaner is dirty.
2. Oil level in crankcase is low.
3. Air slots in engine shroud are plugged.
4. Cooling fins and air passages under
engine blower housing are plugged.
~ ~~
1. Air gap between electrodes of spark
plug is too close.
1. Cooling air flow is restricted
2. Oil level in crankcase is low.
3. Incorrect spark plug.
4. Low oil level.
_.___~~___~___
CORRECTIVE ACTION
~____
1. Move throttle to CHOKE.
2. Fill fuel tank with gasoline.
3. Clean air cleaner element.
See page
6.
4. Tighten spark plug to proper
specification. See page 7.
5. Install spark plug wire on spark plug.
6. Set air gap to proper specification.
See page
7.
7.
Install new, correctly gapped plug.
See page
7.
8. Remove air cleaner element and pull
starter rope continuously until
carburetor clears itself and engine
starts. When engine starts, stop it and
install air cleaner element. See
page
6.
9. Check valve lash. See page 33.
1. Drain gas and clean fuel tank. Fill
____~___
tank with clean, fresh gasoline. See
page
8.
2. Clean or replace fuel tank cap. See
page 8-9.
3. Clean the air cleaner element. See
page
6.
See page 7.
See page 7.
page 6.
_____~____--~-___
1. Install new, correctly gapped plug.
2. Set air gap to proper specification.
3. Clean the air cleaner element. See
____
1. Clean the air cleaner element. See
2. Add oil to crankcase. See page 7.
3. Remove obstruction from slots.
4. Remove obstruction from cooling fins
1. Set air gap to proper specification.
See page
7.
1. Remove any obstruction from slots in
shroud, blower housing, air passages,
and cooling fins on engine.
page
6.
and air passages.
_~___ _~
2. Add oil to crankcase. See page 7.
3. Install new, correctly gapped plug.
1. Change or add oil. Inspect for engine
See page 7.
damage. See page 7.
__ ______
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