Vintage Dirt Bike Q & A

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PostPosted: Thu Apr 07, 2005 11:04 am 
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Joined: Thu May 06, 2004 6:41 am
Posts: 28
Location: Dearborn, MI
Does anyone know where I can get a 1980 CR250R NOS OEM piston kit?
I have a original stock chrome bore, and I am told I need an OEM piston, and they don't make them any more.

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Dale E White
1980 CR250R
2002 R1


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PostPosted: Thu Apr 07, 2005 12:25 pm 
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Joined: Fri Feb 27, 2004 10:20 pm
Posts: 906
Location: San Clemente, CA
Wiseco has all the parts you need to re-build your top-end. There is only one twist. If you have an original chrome bore you use 2756CDM rings, if you have a sleeve you use 2756CD rings, assuming the sleeve has not been bored out. They have over-sized CD rings to go with their larger pistons. But they do not do over-size CDM rings, so it appears that one is forced to go with a sleeve rather than a bore and (chrome) re-plating. I don't believe that Vertex or Pro-X do pistons for this motor...

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Michael Stiles
1979 Honda CR250R Elsinore | 2006 Husqvarna SM510R | 2007 Service Honda CR500R-AF


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