My MJ is 145..only hits 12000, could not go over ..then my engine slow down. But MC21 does....what if I had engine mod with cylinder intake,RS250 crank, MiKuni 38, Could it go up over 12000?? here are some links about NSR mod which can make your NSR250 become unbeatable monster.

http://www.hm3.aitai.ne.jp/%7Eaichi/kaizou2.htm
http://www.hm3.aitai.ne.jp/%7Eaichi/kaizou4.htm
http://www.hm3.aitai.ne.jp/%7Eaichi/kaizou5.htm
http://www.hm3.aitai.ne.jp/%7Eaichi/kaizou6.htm
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1996 HONDA RS250
1995 MC28 NSR250 SE red/white/green
1994 MC28 NSR250 sp W/ RS250 engine