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