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piston part no.

Joined
Aug 10, 2003
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#1
i currently have an 2006 yz265, my cylinder got scored so i will not be able to put another 68.5mm piston in. i would like to be able to by a larger piston and just get my sleeve rebored for it but i cannot find a larger piston and ring set pn.


i see that max power lists a 71mm piston and tghey claim to only use wiseco pistons. i checked wisco website and they don't list anything larger than a 68.5mm

thanks

Jon
 

Rich Rohrich

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#2
Max Power has some pistons custom made by Wiseco, and they charge a HUGE premium if you want to buy one.

Unless the cylinder is totally destroyed your 265 can be replated so you can use the same piston you have been.
 
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#3
i see that the 1998 yz250 has a 69mm piston, what would the difference be between a 1998 piston and a 2006 piston. my assumption is the different powervalves in the engines would mean that they would have to change something on the piston but i wouldn't know what, unless overall height is different because they use different stroke between the 2.
 

Rich Rohrich

Moderator / BioHazard
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#4
I don't have that level of knowledge on the various years of YZ pistons, sorry. Hopefully someone else will be able to help.