rgv mike wrote:Hi Andy,

Thank you for the reply. A lot of good information there. Thank you for posting the dyno print also. That has certainly given me some food for thought. I wonder how the NSR MC21F3 Chassis compares to other 250 production race bikes, TZR 3XV, RGV VJ22 & VJ23, Aprilia?

I spoke to Matt@TYGA earlier, as the weights were niggling me. I was trying to remember something from about 15 years ago... and now it's niggling him too! 🤣🤣🤣

He says when racing, his MC21 was bang on the 116kg limit (Asia Roadrace). His street bike was 115kg, and says 110kg definitely sounds familiar, but can't remember for sure either. We think with a bike full of Ti fasteners/fittings/expansion chambers, alloy screen brace/subframe/instrument mount etc., and carbon bodywork/tank, you could get down to about 105kg these days.... but it would be cheaper to buy an NF5!

Matt has always said his 3XV was a better chassis than his MC21, although [if rules allow] that can be fixed with HRC USD forks. He also said out-of-the-box, the Sugo kitted 3XV was consistently more powerful, but with fine tuning the MC21 was equally as good, if not better. Overall though, he'd always prefer both the Honda's characteristics, and ease of use/maintenance, but it's a very close call. The NSR is exceptionally simple to work on in race trim, compared to the TZR and RGV/RS. (F3 spec is essentially the same as an RS250R NF5)

As Les says, a well worked MC21 with a few choice parts is a cracking bike. Mine makes 66.5rwhp, and still runs OEM twin ring pistons and standard PGM-III ignition. It also runs period Ethos pipes from the early 90s, and I am sure would be be better with new TYGAs. (I just love my Ethos pipes though, and have never seen another set!)



Exactly the same setup (no jetting changes), but with a set of peaky pipes made by Martin77, saw it make 67.4hp that day.

If you want a good NSR250R motor, the only place to go in the UK is Performance Engineering. Hand on heart, I can say no one in the UK knows them better than Steve.
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Andy.
NSR-WORLD.COM

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