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Condition
Engine speed drops quickly under
load – low power
Engine running extremely rich, no
power and very low maximum
speed
Engine running too rich, low power
and low maximum speed
Erratic idle – too lean
16
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Cause
Air filter dirty
Throttle shutter not opened fully
Tank vent faulty
Fuel pickup body dirty
Fuel strainer dirty
Leak in fuel line between tank and
fuel pump
Setting of high speed screw (H) too
rich
Main jet bores or ports blocked
Pump diaphragm damaged or
fatigued
Air valve does not open
Air valve does not open fully in full
throttle position
Air valve does not close properly
Remedy
Clean the air filter
Check throttle rod
Replace tank vent
Install new pickup body
Clean fuel strainer in carburetor,
replace if necessary
Install new fuel line
Check basic carburetor setting,
correct if necessary
Clean the carburetor
Fit new pump diaphragm
Check lever on air valve and
replace if necessary
Check lever on air valve and
replace if necessary
Check lever on air valve and
replace if necessary
MS 171, MS 181, MS 211
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