[rigoscrf]

Is there a differnce between intake and exhaust shim diameters? The Honda parts finder shows different reference numbers on the fische (16 and 17). I measured with a "cheap" digital caliper and they both seem to be at 7.46mm. I don't plan on using OEM shims but, am just curious if there is an actual difference. Also, I just installed the faction intake kit and the exhaust shims seem to fit fine.
Thanks

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They are the same. The 250 thumpers of all brands use the same size shim 7.48 intake/exhaust , same with the 450's except they are 9.48's. Doug

[rigoscrf]

Thanks for the info. Will search tomorrow.

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Also, I just installed the faction intake kit and the exhaust shims seem to fit fine

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What did you do to your valve seats and guides anyway ? Doug

[rigoscrf]

The stock titanium valves looked fine and clearance was okay. I just upgraded/downgraded to the steel intake valves as preventative maintenance. The seats and guides look good. I purchased the bike as a basket case; due to exhaust rocker arm failure and am slowly bringing it back to life.

[rigoscrf]

Thanks for the heads up. I do realize that I am going by visual only and no I am not a CRF specialist. However, I have been a Honda auto tech. for about seventeen years and am willing to give it a try as is. I lapped all valves and they look good. I don't think the bike has had to much use on it but, did notice an engraving on the cylinder head that read SL40. I am not sure what it stands for but am "guessing" that it had some recent work to it. Anyways, tearing it back down is not too big a deal.