Engine - Stihl MS 290 Manual

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
Engine does not start easily, stalls
at idle speed, but operates normally
at full throttle
Engine does not deliver full power
or runs erratically
Engine overheating
MS 290, MS 310, MS 390
Cause
Manifold leaking
Oil seals on crankshaft damaged
Joint between cylinder and engine
pan leaking or damaged (cracks)
Piston rings worn or broken
Muffler / spark arresting screen (if
fitted) carbonized
Air filter element dirty
Fuel / impulse line severely kinked
or damaged
Insufficient cylinder cooling. Air
inlets in fan housing blocked or
cooling fins on cylinder very dirty
Remedy
Seal or replace the manifold
Replace the oil seals
Seal or replace engine pan
Fit new piston rings
Clean the muffler (inlet and
exhaust), replace spark arresting
screen, replace muffler if necessary
Replace air filter element
Replace lines or position them free
from kinks
Thoroughly clean all cooling air
openings and the cylinder fins
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