17
MS 231, MS 231 C, MS 251, MS 251 C
Condition
Cause
Remedy
Engine speed drops quickly under
load – low power
Air filter dirty
Clean air filter or replace if
necessary
Throttle shutter not opened fully
Check throttle rod
Tank vent faulty
Replace tank vent
Fuel pickup body dirty
Install new pickup body
Fuel strainer dirty
Clean fuel strainer in carburetor,
replace if necessary
Leak on fuel hose from tank to
carburetor
Seal connections or install new fuel
hose
Setting of high speed screw
H
too
rich
Check basic carburetor setting,
correct if necessary
Main jet bores or ports blocked
Clean the carburetor
Pump diaphragm damaged or
fatigued
Fit new pump diaphragm
Ignition timing wrong, flywheel out
of adjustment
– key in flywheel has sheared off
Install new flywheel
Engine running extremely rich, has
no power and a very low maximum
speed
Choke shutter does not open
Check carburetor and choke shaft,
service or replace if necessary
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