15MS 461, MS 461-R
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 cable and rod
Tank vent faulty Fit new tank vent
Fuel pickup body dirty Fit new pickup body
Fuel strainer dirty Clean fuel strainer in carburetor,
replace if necessary
Leak in fuel hose between pickup
body and 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 has sheared off or slot in
flywheel is worn
Install new flywheel or key
Engine running extremely rich, has
no power and a very low maximum
speed
Choke shutter does not open fully Check carburetor and choke shaft,
service or replace if necessary
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