1999-2002 TRX400EX Fourtrax Service Manual, Page 169Get this manual
FRONT WHEELSUSPENSIONSTEERING Place the proper size adaptor onto the threaded shaft and then put the wheel over the threaded shaft and adaptorLubethe bead area with water, pressing down on the tire sidewallbead area in several places to allow the water to run into and around the beadAlso lube area where the breaker arm wi II contactthe sidewall of the tireBREAKER ARM ASSEMBLY TIRE RIM