2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 103Get this manual
STEERING SYSTEM INSPECTION TOE-IN ADJUSTMENT
INSP ADJ
3.Check: Tie-rod ends Turn the handlebar to the left andor right until it stops completely, then move the handlebar from the left to the right slightlyTie-rod end has any vertical play Replace the tie-rod end(s)
4.Raise the front end of the machine so that there is no weight on the front wheels5.Check: Ball joints andor wheel bearings Move the wheels laterally back and forthExcessive free play Replace the front arms (upper and lower) andor wheel bearings