Operations Manual

21
6.2 Engine Troubleshooting
SYMPTOM POSSIBLE CAUSE SOLUTION
Ignition plug not properly
connected
Check ignition system
Carbon deposit at ignition Clean or replace ignition
Short circuit due to deficient
insulator
Replace insulators
Improper spark plug gap
Set spark plug gap to the correct
gap
Short circuit at stop switch
Check stop switch circuit Replace
stop switch if defective
Ignition coil defective Replace ignition coil
Muffler clogged with carbon
deposits
Clea
n or replace muffler
Mixed fuel quality is inadequate Check fuel to oil mixture
Fuel is inadequate (water, dust)
Flush fuel system and replace with
fresh fuel
Air filter clogged Clean or replace air filter
Defective cylinder head gasket
Tighten cylinder head bolts or
replace head gasket
Cylinder worn Replace cylinder
Spark plug loose Tighten spark plug
Air cleaner clogged Clean or replace air cleaner
Air i
n fuel line Bleed (remove air) from fuel line
Fuel level in carburetor float
chamber improper
Adjust carburetor float
Carbon deposit in cylinder Clean or replace cylinder
Difficult to start, fuel is available,
but spark plug will not ignite
Difficult to start, fuel is available
but spark plug will not ignite
Fuel is available and spark plug
ignites (Compression normal)
Fuel is available and spark plug
ignit
es (Compression normal)
Operation not satisfactory
Not enough power available
(Compression normal, no misfiring)