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Message: [QUOTE="wrooster, post: 94605, member: 21800"] randy, i haven't done the wr-->yz timing mod yet, in fact that's what i was planning on doing tonight. now you got me all worried. i assume that you followed the cam cover/camshaft disassembly instructions in your yamaha manual, then used the pics from the may 2001 issue of "dirt bike" mag (pages 68-69) or something similar to make the adjustment to the exhaust cam (it's the one towards the front of the bike), and finally followed the yamaha manual (including the assembly oil/lube) to put it all back together. (check [url]http://losdos.dyndns.org:8080/public/wr-yz-timing-change/wr-yz-timing-change.jpg[/url] if you don't have the mag. please note i got this off of another web site-- i'm not trying to rip off "dirt bike" mag, just trying to make sure we all don't blow up our engines!). as for the yamaha gasket sealer-- i bought some perma-tex gasket sealer the other day, i don't see any reason why it won't work just the same. you can always take the cover back off and put the timing back where it was, is that what you mean by "factory specs"? just so we are on the same page, you do have a USA-spec wr250f, right? i've heard rumors that other countries may have the yz timing, but i'm really not sure about that. other issues might be your jetting, also did you have the carb off of the engine when you did the mod? i'm thinking that there might be an air leak someplace in one of the carb boots. the wrooster [/QUOTE]