9BR 500, BR 550, BR 600
Condition Cause Remedy
Engine will not idle,
idle speed too high
Throttle shutter opened too wide by
idle speed screw (LA), throttle
cable adjustment incorrect
Reset idle speed screw (LA), check
throttle cable adjustment
Engine leaking Seal the engine
Engine stalls at idle speed Idle jet bores or ports blocked Clean jets and ports and blow clear
with compressed air
Idle jet too rich or too lean Set low speed screw (L) correctly
Setting of idle speed screw
incorrect – throttle shutter
completely closed
Set idle speed screw (LA) correctly
Small plastic disc in valve jet does
not close
Clean or renew valve jet
Engine speed drops quickly under
load – low power
Air filter plugged Clean air filter
Throttle shutter not opened fully Check throttle cable adjustment
Tank vent faulty Clean or replace tank vent if
necessary
Fuel pickup body dirty Clean or replace pickup body
Fuel strainers dirty Fit new fuel strainers
Leak in fuel line between tank and
fuel pump
Seal or renew connections and fuel
line
Setting of high speed screw (H) too
rich
Turn 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
RA_452_00_01_02.book Seite 9 Donnerstag, 16. Februar 2012 11:52 11
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