18 MS 441, MS 441 C
4.7 Engine
Always check and, if necessary,
repair the following parts before
looking for faults on the engine:
– Air filter,
– Fuel supply,
– Carburetor,
– Ignition system
Condition Cause Remedy
Engine does not start easily, stalls
at idle speed, but operates normally
at full throttle
Oil seals in crankcase damaged Replace the oil seals
Crankcase leaking or damaged
(cracks)
Seal or replace the crankcase
Engine does not deliver full power
or runs erratically
Piston rings worn or broken Fit new piston rings
Muffler/spark arresting screen
carbonized
Clean the muffler (inlet and
exhaust), replace spark arresting
screen, replace muffler if necessary
Air filter dirty Replace air filter
Fuel line/ impulse line severely
kinked or damaged
Fit new hoses or position them
without kinks
Decompression valve not closed Close decompression valve,
check and replace if necessary
Air flap does not open Check carburetor; install a new
carburetor if necessary
Engine overheating Insufficient cylinder cooling. Air
inlets in fan housing blocked or
cooling fins on cylinder very dirty
Thoroughly clean all cooling air
openings and cooling fins
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