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SYMPTOM
Travel speed too low, and vibration is
weak.
SYMPTOM
Difficult to start, "fuel is available,
but no SPARK at spark plug".
Difficult to start, "fuel is available,
and SPARK is present at spark
plug.
Difficult to start, "fuel is available,
spark is present and compression
is normal"
Difficult to start, "fuel is available,
spark is present and compression
is low.
No fuel present at carburetor.
"Weak in power" compression is
proper and does not mistire.
"Weak in power" compression is
proper but mistires.
Engine overheats.
Rotational speed fluctuates.
Recoil starter malfunction.
TROUBLE SHOOTING
POSSIBLE CAUSES
Engine speed too low?
Clutch slips?
V-belt slips?
Excessive oil in vibration?
Malfunction in vibrator housing?
Bearing Failure?
Insufficient engine output?
ENGINE TROUBLE SHOOTING
POSSIBLE CAUSE
Spark plug bridging?
Carbon deposit on spark plug?
Short circuit due to deficient
spark plug insulation?
Improper spark plug gap?
ON/OFF switch is shorted?
Ignition coil defective?
Improper spark gap, points dirtry?
Condenser insulation worn or
short circuiting?
Spark plug wire broken or short circuiting?
Wrong fuel type?
Water or dust in fuel system?
Air cleaner dirty?
Suction/exhaust valve stuck or protruded?
Piston ring and/or cylinder worn?
Cylinder head and/or spark plug not
tightened properly?
Head gasket and/or spark plug
gasket damaged?
Fuel not available in fuel tank?
Fuel cock does not open properly?
Fuel filter clogged?
Fuel tank cap breather hole cloged?
Air in fuel line?
Air cleaner not clean?
Improper level in carburetor?
Defective Spark plug?
Water in fuel system?
Dirty spark plug?
Ignitiion coil defective?
Spark plug heat value improper?
Correct type of fuel?
Cooling fins dirty?
Governor adjusted correctly?
Governor spring defective?
Fuel flow restricted?
Recoil mechanism clogged with
dust and dirt?
Sprial spring loose?
9
SOLUTION
Set engine speed to correct RPM.
Check or replace clutch.
Adjust or replace V-belt.
Drain excess oil and fill to proper level.
Check eccentric, gears and counter weights.
Replace Bearing
Check engine, compression etc.
SOLUTION
Check gap, insulation or replace spark plug.
Clean or replace spark plug.
Check spark plug insulation, replace if worn.
Set to proper gap.
Check switch wiring, replace switch.
Replace ignition coil.
Set correct spark gap and clean points.
Replace condenser.
Replace defective spark plug wiring
Flush fuel system, and replace with
correct type of fuel.
Flush fuel system.
Clean or replace air cleaner.
Re-seat valves.
Replace pistion rings and or pistion.
Torque cylinder head bolts and spark plug.
Replace head and spark plug gaskets.
Fill with correct type of fuel.
Apply lubricant to loosen fuel cock level,
replace if necessary.
Replace fuel filter.
Clean or replace fuel tank cap.
Bleed fuel line.
Clean or replace air cleaner.
Check float adjustment, re-build carbureator.
Clean or replace spark plug.
Flush fuel system, and replace with
correct type of fuel.
Clean or replace spark plug.
Replace ignition coil.
Replace with correct type of spark plug.
Replace with correct type of fuel.
Clean cooling fins.
Adjust governor.
Replace governor spring.
Check entire fuel system for leaks or clogs.
Clean recoil assembly with soap and water.
Replace sprial spring.
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