1999-2002 TRX400EX Fourtrax Service Manual, Page 71Get this manual
FUEL SYSTEM FLOAT AND JETS
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 installedCAUTION: Damageto the pilotscrewseatwill occur i"fhe pilot screw is tightened against the seat Install the needle jet, needle jet holder and tighten the lock nutInstall the mainjet and slow jetCAUTION: Handle the jets with careThey can easily be scored or scratched'99 -'00
NEEDLEJETO-RING