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4.7
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 171, MS 181, MS 211
All manuals and user guides at all-guides.com
Cause
Oil seals in engine damaged
Engine leaking or damaged
(cracks)
Piston rings worn or broken
Muffler / spark arresting screen
carbonized
Air filter element dirty
Fuel hose severely kinked or
damaged
Tank vent faulty
Air valve does not open
Insufficient cylinder cooling. Air
inlets in fan housing blocked or
cooling fins on cylinder very dirty
Remedy
Replace the oil seals
Seal or replace the engine
Fit new piston rings
Clean the muffler (inlet and
exhaust), replace spark arresting
screen, replace muffler if necessary
Replace air filter element
Fit new hose or position it free from
kinks
Check tank vent and replace if
necessary
Check air valve and replace if
necessary
Thoroughly clean all cooling air
openings and the cylinder fins
17
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