Stihl MS 210 Service Manual page 14

Condition
Engine will not idle,
idle speed too high
Engine stalls at idle speed
Engine speed drops quickly under
load – low power
MS 210, MS 230, MS 250
Cause
Throttle shutter opened too wide by
idle speed screw (LA)
Engine leaking
Idle jet bores or ports blocked
Idle jet too rich
Setting of idle speed (LA)
incorrect – throttle shutter
completely closed
Small plastic plate in valve jet
does not close
Air filter plugged
Tank vent faulty
Leak in fuel line between tank and
fuel pump
Pump diaphragm damaged or
fatigued
Main jet bores or ports blocked
Fuel pickup body dirty
Fuel strainers dirty
Remedy
Reset idle speed screw (LA)
correctly
Seal the engine
Clean jet bores and ports with
compressed air
Screw down low speed screw (L)
slightly
Set idle speed screw (LA) correctly
Clean or renew valve jet
Clean or renew the air filter
Clean tank vent or replace if
necessary
Seal connections or install new fuel
line
Fit a new pump diaphragm
Clean the bores and ports
Clean the pickup body, fit a new
filter
Clean the fuel strainers
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