85 & 86 250r big bore question

[gasmask]

i just bought a 295 big bore cylinder,piston & head...it needs piston rings...the following #s are stamped on the piston: B0012, 8004 & 72.45mm...now looking in a book i have i see 72.00mm,72.25mm,72.50mm,73.00mm & 73.50mm!!! i don't see my size...what do i do??????? help please.....

[deathman53]

maybe its a pro-x piston? they are cast and can be run at higher tolerances

[skippy]

yepper.. and its prob an la sleeve job.. they will supply with parts if you cant find them from somewhere else.. i have two 295cc top ends. la currently is resleeving one and matching the porting.. they are cheap, but they do a nice job..