my 98 wr400f keeps jumping time... it ran just fine last saturday (i raced it), and went riding sunday and it stranded me in the woods. checked the timing... was out of time on intake sprocket (which explains why it felt like it lost compression.) I put it back in time, and it ran better than before, and would idle much stronger (also, explained by being slightly out of time.) then, yesterday, i got it out of my trailer to race and just barely got it started before it did it again.. luckily i was trying to sell my cousins 00 rm250, so i didn't lose points in the series and raced it. back to the wr... when we checked the timing the first time, we removed the tensioner, and could pull the chain completely off the cam sprockets and rotate them without removing them from the shafts. I think the chain is stretched.... so what all do i need? 1)timing chain 2)tensioner guide 3) any thing else??? thanks xrracer36 (i race a modified xr200 in the 125 class, which explains the name...had i gotten the wr first, it would be wrracer36) P.S. why did my cousins rm 250 make me faster than usual for that race... i cleared jumps i normally do in 3rd gear on the wr in 2nd on the suzuki, easily... p.s.s. a stock yzf pipe installed on the wr makes it runs like crazy... most yzf owners ditch the stocker for an aftermarket asap, but the stocker is one of the best performing pipes anyways.. they can be found cheap.