Lumag CNCJ-72FW, Operator'S Manual

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CNCJ-72FW CNCJ-80K – TROUBLES
HOOTING GUIDE
Table 4 ENGINE TROUBLESHOOTING
SYMPTOM POSSIBLE PROBLEM SOLUTION
Difficult to start
Fuel is available but
spark plug will not
ignite. (Power available
at high tension cable).
Ignition plug being bridge? Check ignition system.
Carbon deposit at ignition? Clean or replace ignition.
Short circuit due to defective
insulators?
Replace insulators.
Improper spark gap? Set spark plug gap to the correct gap.
Fuel is available but
spark plug will not
ignite. (Power NOT
available at high
tension cable).
Short circuit at stop switch
Check stop switch circuit. Replace stop
switch if defective.
Ignition coil defective? Replace ignition coil.
Fuel is available and
spark plug ignites
(compression normal ).
Muffler clogged with carbon
deposits?
Clean or replace muffler.
Fuel in use inadequate (water,
dust)?
Flush fuel system and replace with fresh
fuel.
Air Cleaner clogged? Clean or replace air cleaner.
Fuel is available and
spark plug ignites
(compression low ).
Defective cylinder head
gasket?
Tighten cylinder head bolts or replace head
gasket.
Cylinder worn? Replace cylinder.
Spark plug loose? Tighten spark plug
Operation not satisfactory
Not enough power
available (compression
normal, no misfiring).
Air cleaner clogged? Clean or replace air cleaner.
Air in fuel line? Bleed (remove air) from fuel line.
Fuel level in carburetor float
chamber improper?
Adjust carburetor float.
Carbon deposits in cylinder? Clean or replace cylinder.
Not enough power
available (compression
normal, misfiring).
Ignition coil defective?
Flush fuel system and replace with fresh
fuel.
Ignition plug often shorts? Clean or replace crankcase.
Fuel in use inadequate (water,
dust)?
Clean or replace muffler.
Engine overheats.
Combustion chamber? Clean or replace crankcase.
Exhaust or muffler clogged
with carbon.
Clean or replace muffler.
Spark plug heat value
incorrect?
Replace spark plug with correct type spark
plug.