7-3
PROBLEM CAUSE SOLUTION
Poor acceleration
Engine runs but misfiring
Excessive fuel consumption
Blue exhaust smoke
White exhaust smoke
Low oil pressure
1. Accelerating pump
2. Throttle not fully open
3. Ignition or carburizing
4. Air intake obstructed
5. Engine overheating
1. Fouled spark plug(s)
2. Wet spark plug wires
3. Loose ignition wires
4. Defective fuel pump
5. Partially clogged fuel filter
6. Incorrect carburetor mixture
7. Contaminated fuel
1. Faulty fuel pump
2. Spark plugs bad or set improperly
3. Incorrect timing
1. Lube level too high
2. Oil too thin
3. Oil overheated
1. Engine misfiring
2. Spark plugs dirty or not gapped correctly
1. Insufficient oil in crankcase
2. Excessive oil in crankcase
1. Replace.
2. Inspect cable and linkages for binding,
obstructions, or loose fasteners.
3. Service ignition system and carburetor.
4. Check air intake.
5. Check engine temperature (See Engine
Owner/Service Manual).
1. Remove, clean, or replace.
2. Wipe dry, inspect and replace
damaged wires.
3. Inspect all wire connections.
4. Repair or replace as required.
5. Clean or replace fuel filter.
6. See Engine Owner/Service Manual for
proper carburetor adjustment.
7. Drain fuel tank, flush clean and replace
fuel filter.
1. Repair or replace as required.
2. Clean and set or replace spark plugs
3. Time engine.
1. Drain off excessive oil.
2. Drain and replace oil (See Engine
Owner/Service Manual).
3. Check cooling system.
1. See Engine Owner/Service Manual.
2. Clean, adjust gap, or replace.
1. Check and add correct grade and
viscosity oil. Visually check engine
for leaks.
2. Check and remove required amount of
oil. Check for cause of excessive oil
(improper filling, bad fuel pump, etc.).
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