13MS 440, MS 440 C
4.6 Engine
Always check and, if necessary,
repair the following parts before
looking for faults on the engine:
Air filter
Fuel system
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)
Seat or replace the crankcase
Leak in muffler Seal / replace muffler
Engine does not deliver full power
or runs erratically
Piston rings worn or broken Replace piston rings
Muffler / spark arresting screen
carbonized
Clean muffler (inlet and exhaust
opening), replace spark arresting
screen
Air filter insert soiled Replace air filter insert
Fuel / impulse hose severely kinked
or damaged
Fit new hoses or position them free
from kinks
Decompression valve sticking Replace the decompression valve
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 the cylinder fins.
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