1985-1986 Honda ATC250R Shop Manual, Page 55Get this manual
FUEL SYSTEM Push the cable holder in and turn it 90 degreesThen remove the cable holder and jet needle, set collar and set springCABLE HOLDER
SET SPRING
SET COLLAR
JET NEEDLE
THROTTLE VALVE Remove the jet needle from the throttle valveInspect the throttle valve and jet needle for dirt, scratches or wearInstall the reverse order of removal