Use and Care Manual

- 7 -
ENGINE TROUBLESHOOTING
SYMPTOM
POSSIBLE CAUSE
SOLUTI0N
Difficult to start, "fuel is
available， but no
PARK at spark plug"．
Spark plug bridging?
Check gap．insulation or replace spark
plug．
Carbon deposit on spark plug?
Clean or replace spark plug．
Short 0circuit due to deficient
spark plug insulation?
Check spark plug insulation, replace if
worn．
Improper spark plug gap?
Set to proper gap．
Difficult to start．"fuel
is available, and
SPARK is present at
spark plug．
ON/OFF switch is shorted?
Check switch wiring,replace switch．
Ignition coil defective?
Replace ignition coil．
Improper spark gap，points dirty?
Set correct spark gap and clean points．
Condenser insulation worn or
short circuiting?
Replace condenser．
Spark plug wire broken or short
circuiting?
Replace defective spark plug wiring
Difficult to start, "fuel is
available, spark is
present and
compression is normal"
Wrong fuel type?
Flush fuel system, and replace with
correct type of fuel．
Water or dust in fuel system?
Flush fuel system．
Air cleaner dirty?
Clean or replace air cleaner．
Difficult to start,"fuel
is available, spark is
present and
compression is low.
Suction/exhaust valve stuck or
protruded?
Re-seat valves．
Piston ring and/or cylinder worn?
Replace piston rings and or piston．
Cylinder head and/or spark plug not
tightened properly?
Torque cylinder head bolts and spark
plug．
Head gasket and/or spark plug gasket
damaged?
Replace head and spark plug gaskets．
No fuel presetlt at
carburetor．
Fuel not available in fuel tank?
Fill with correct type of fuel．
Fuel cock does not open properly?
Apply lubricant to loosen fuel cock level,
replace if necessary．
Fuel filter clogged?
Replace fuel filter．
Fuel tank cap breather hole clogged?
Clean or replace fuel tank cap．
Air in fuel line?
Bleed fuel line．
"Weak in power"
compression is
proper and does not
mistire．
Air cleaner not clean?
Clean or replace air cleaner．
Improper level in carburetor?
Check float adjustment, re-build
carburetor．
Defective Spark plug?
Clean or replace spark plug．
"Weak in power"
compression is
proper but mistires．
Water in fuel system?
Flush fuel system，and replace with
correct type of fuel．
Dirty spark plug?
Clean or replace spark plug．
Ignition coil defective?
Replace ignition coil．
Engine overheats．
Spark plug heat value improper?
Replace with correct type of spark plug．
Correct type of fuel?
Replace with correct type of fuel．
Cooling fins dirty?
Clean cooling fins.
Rotational speed
fluctuates．
Governor adjusted correctly?
Adjust governor．
Governor spring defective?
Replace governor spring．
Fuel flow restricted?
Check entire fuel system for leaks or
clogs．
Recoil starter
malfunction．
Recoil mechanism clogged with
dust and dirt?
Clean recoil assembly with soap and
water．
Sprial spring loose?
Replace sprial spring．