Hi i just want to find out wat nsr is compatebel with honda 92 rs250 cylinders and crank
becos i have all thos parts and no nsr

Very little if anything goes straight in, definately not the crank, the cylinders will bolt on but the powervalves are cabled up differently, the exhausts don't fit, the RS pistons are a different height so deck heights are wrong and so on.
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Almost anything's compatible if you have a machine shop and welder at your disposal

Thank you
but wat model will work the best mc18,21,28 for the smalest amant of machineing

The mc16 is nearest to an NF5 RS and (if you've got the right year bits) the only one you're going to be able to come near to just bolting togeather, the F3 mc16 manual just reads "fit RS crank", "fit RS pistons", "fit RS gearbox", "fit RS electrics" etc.

By the time we get to the '18 nothing just fits though the crank is still RS style, MC21 and MC28 are not.

But Matt's right, it can all be presuaded to go in, after all an RD350 motor fits in an mc21 if you try hard enough.

There is a wicked F250 (uk club proddy race series) bike there to be built as RS cases are banned but RS internals, barrels and electrics are not, nor is RS running gear. An RS with an NSR frame and crankcase would be legal though possibly not in the spirit of things.
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Thank you fonty
i think i will go for a mc18 then i have seen one at a bike shop neer my hous in not so good state
dit the mc18 sp cum with a dry clutch

1988 MC18 SP didn't
1989 MC18 SP did
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The Chopster