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FCR Carb Problem

2K views 9 replies 6 participants last post by  Stopwatch 
you are referring to different needles here,
the ones that control the midrange fuel
supply by blocking the squirt from the main
jet are the ones that are accessable if you
take the carburator top off.

the fuel shut off needles are to be find inside
the float bowl connected to the float of course.

i have never opened FCRs yet, sold my 39mm's
without getting to use them, but this should be
the same with any carb i can think of.


for your problem: maybe the return line got
kinked with your last lift of the tank ?
bike is not running okay at iddle because it is
running way too rich as the fuel will be pushed
trough the main jet at all times.
if the fuel return line is okay, i'd check the free
play of the floats and have the shut off needles
replaced probably.

cheers. :)
 
sometimes a single grain of dirt prevents
the fuel shut-off needle to fully close the
fuel entrance.
with a system in use it is more likely that
the viton tip of the needle valve has simply
worn off and got to be replaced though.
you will notice a small ring around the needle's
tip, a sign that it is calling for replacement
probably, at least when the system is leaking
already.
 
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