16 MS 441, MS 441 C
Condition Cause Remedy
Engine will not idle, idle speed too
high
Throttle shutter opened too wide by
idle speed screw LA
Correct setting of idle speed
screw LA
Oil seals /crankcase leaking Seal or replace oil seals /
crankcase
Air flap dirty – air flap does not
close
Clean air flap, install new
carburetor if necessary
Air flap stiff Check carburetor, replace if
necessary
Throttle cable stiff – throttle shutter
does not close
Fit new throttle cable
Engine stalls at idle speed Idle jet bores or ports blocked Clean the carburetor
Idle jet too rich or too lean Set low speed screw L correctly
Setting of the idle speed screw
incorrect – throttle shutter
completely closed
Set idle speed screw LA correctly