2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 130Get this manual
FUEL SYSTEM ('04'05) JETS AND FLOAT Damage to the pilot screw seat will occur if the pilot screw is tightened against the seatHandle all jets with careThey can easily be scored or scratched
Install the pilot screw with the spring, washer and new O-ring and return it to its original position as noted during removalPerform the pilot screw adjustment if new pilot screw is installed (page 7-23)Install the needle jet and needle jet holder, tighten the lock nut and install the main jetInstall the slow jetInstall the starter jet and rubber plug
RUBBER PLUG
I MAIN JET