does any one know if the honda rs 250 pistons will go into mc 18 barrels or does any one know what mods have to be done to make them fit and whitch rs pistons to use
RS250 pistons will fit, but they use a different sized small-end bearing/gudgeon (wrist) pin to the NSR.
The bearing you need is an HRC F3 part only, and extremely difficult to obtain. I know where there are 3, but they aren't for sale.
The problem with "alternative" caged small-end bearings is their speed rating. The NSR/RS bearings are rated to 14,000rpm, but "normal" bearings (from a factor, for example) are only rated to, if I remember correctly, 12,000rpm.
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