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15MS 341, MS 361, MS 361 C
Condition Cause Remedy
Engine speed drops quickly under
load – low power
Air filter dirty Clean the air filter
Throttle shutter not opened fully Check linkage
Tank vent faulty Clean tank vent or replace if
necessary
Fuel pickup body dirty Clean the pickup body, fit a new
filter
Fuel strainers dirty Replace the fuel strainers
Leak in fuel line between tank and
fuel pump
Seal connections or install a new
fuel line
Setting of high speed screw (H)
too rich
Rotate high speed screw (H)
clockwise (leaner), no further than
stop
Main jet bores or ports blocked Clean the carburetor
Pump diaphragm damaged or
fatigued
Fit new pump diaphragm
Impulse hose damaged or kinked Fit new impulse hose
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