hi.
the only different between the engine cases is the rear, upper engine mounting. The rest of the case is the same. I think its not so good idea for the road, you have to change the pistons every 500km.... Maybe its the better way you will sell me your engine, if you have one. I need a spare engine for my 1992 rs .

regards
christian
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nsr300se rs250r´05 ns-1rr