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CT-73RA – TROUBLESHOOTING GUIDE
Table 4: ENGINE TROUBLESHOOTING
Symptom Possible Problem Solution
Difficult to Start
Ignition plug being bridge? Check ignition system.
Fuel is available but spark Carbon deposit at ignition? Clean or replace ignition.
plug will not ignite. Short circuit due to Replace insulators.
(Power available at high defective insulators?
tension cable). Improper spark gap? Set spark plug gap to the
correct gap.
Fuel is available but spark Short circuit at stop Check stop switch circuit.
plug will not ignite. switch? Replace stop switch if
(Power NOT available at defective.
high tension cable). Ignition coil defective? Replace ignition coil.
Muffler clogged with Clean or replace muffler.
Fuel is available but spark carbon deposits?
plug ignites. Fuel in use inadequate Flush fuel system and
(Compression normal). (water, dust)? replace with fresh fuel.
Air Cleaner clogged? Clean or replace air
cleaner.
Fuel is available but spark Defective Cylinder head Tighten cylinder head
plug ignites. gasket? bolts or replace head
(Compression low). gasket.
Cylinder worn? Replace cylinder.
Spark plug loose? Tighten spark plug.
Operation not Satisfactory
Air Cleaner clogged? Clean or replace air
Not enough power cleaner.
available (compression Air in fuel line? Bleed (remove air) from
normal, no misfiring) fuel line.
Carbon deposits in Clean or replace cylinder.
cylinder?
Ignition coil defective? Flush fuel system and
Not enough power replace with fresh fuel.
available (compression Ignition plug often shorts? Replace ignition wires,
normal, misfiring) clean ignition.
Fuel in use inadequate Flush fuel system and
(water, dust)? replace with fresh fuel.
Mined fuel quality is Check fuel to oil mixture.
inadequate?
Engine Overheats Excessive carbon deposits Clean or replace
in combustion chamber? crankcase.
Exhaust or muffler clogged Clean or replace muffler.
with carbon?
Spark plug heat value Replace spark plug with
incorrect? correct type of spark plug.
