Honda CRF50F 2004 Service & Repair Manual page 6

FUEL SYSTEM
5-6
Remove the carburetor top and throttle valve from
the carburetor.
Remove the throttle cable from the throttle valve
while compressing the throttle valve spring.
Remove the jet needle retainer and jet needle.
Check the throttle valve and jet needle for scratches,
wear or damage.
JET NEEDLE
THROTILE VALVE
RETAINER
JET NEEDLE