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yz205f valve clearance

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Posted by: Dave88---------------------

hey i just got an 03 yzf250. i love the bike. I am just wondering how i go about checking valve clearances. I dont want this thing to blow up on me. Thanks!


Posted by: nikki---------------------

My last bike was an '03 YZ 250F.... here is my write up on checking the valves:

http://www.dirtrider.net/forums3/sh...ighlight=feeler


Posted by: Dave88---------------------

thanks man thats what i was looking for! Any other writeups would be appreciated.


Posted by: Dave88---------------------

hey i just checked my clearances. The exhaust is within spec. the intake however is .09 mm. spec is .10mm - .17mm. is it imperative that i fix this right away or will i be okay to keep an eye on it and fix it if it starts getting worse.


Posted by: _JOE_---------------------

You might as well do it while you're in there. Its only gonna get tighter. A shim and a few minutes is better than a whole top end and several hours.


Posted by: Dave88---------------------

yeah i'll take care of it but my question is do i run any serious risk of screwing it up if i ride it for a little until i have time to take care of it.


Posted by: Ol'89r---------------------

Quote:
Originally Posted by Dave88
yeah i'll take care of it but my question is do i run any serious risk of screwing it up if i ride it for a little until i have time to take care of it.



If you are out of limits, fix it. You may still have clearance when the engine is cold but, when everything heats up, that clearance goes away due to the heat expansion in the metal. If you don't have the proper clearance your valves will not close all of the way and hot gasses will burn the valve face and seat. This happens very quickly and will result in having to replace the valves, re-cut the seats or possibly have to replace the head.

It's your call. Awww, what the hell, it's only money.



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