1986-1989 Honda TRX250 FourTrax 250R Service Manual, Page 48Get this manual
FUEL SYSTEM
THROTTLE VALVE ASSEMBLY
Install the need le clip on the jet needleSTANDARD POSITION (from the top): '86, After '88: 4th groove '87, '88: 3rd groove Install the jet needle into the throttle valve
(2) JET NEEDLE
Install the set collar over the jet needle and clip, then install the set spring and cable holderPush the cable holder in and turn it 90 degrees