has anyone tried fitting a four stroke engine into a NSR preferably a MC21, if so which engine did they use. Just being curious.

What about putting in a CRF250R or CRF250X 4 stroke, does anyone think this can be put in a MC21?

Harc-pro are doing something like this and putting it into semi-production. Maybe. Except they are putting 4-strokes into an RS frame ... I think. There's a picture on my "pictures from my weekend" post.
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MC28 SE -sold-
MC21 with RS250 engine -for sale-
MC21 race bike -soon for sale-

http://www.dreamgate.ne.jp/nsr/Project%20NSR/NSR500/500_part3maim.html

nsr wrote:What about putting in a CRF250R or CRF250X 4 stroke, does anyone think this can be put in a MC21?

What's the point? They will make less power and will no doubt weigh more...
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Oh ya, people do it all the time !

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=2489297106&rd=1&sspagename=STRK%3AMEWA%3AIT

As you can see they aren't worth much once your done.

Fun project but what's the point ?

http://www.barebones.net/machines.htm These guy have done many.

does anyone know if someone has fitted a rd or rg 500 engine in a nsr.i knew 3 people years a go who fitted the 350 powervalve engine in to the rg 250,i know this was a common thing to do at the time.im not interested in fitting a 500 engine myself i just interested if someone had tried the rd or rg engine.

I seen it done in a Aprilla RS250.

what was it a rd or rg 500.do you know much about it.

I think some one did this... think think think... was a V4, Oh yes was honda. Its called an NC30 Only playing

It was a RG and the link may still be at the NSR250 topica list thats were I got it from a user on the list.

I'm just curious becuase Im thinking of going 4 stroke becuase i think its more reliable than 2. ALso something to due during the winter season here in Canada.

howdy

Go on put a crf450 lump in, 250 are not worth it. At the moment a few of my freinds use 450 for super moto and they are the nuts, wheelies everywere off the throttle etc, and the roll on responce is just a hoot.

I looked at putting a big lump in one of my frames years ago and it seemed a lot of work, I have a rg500 with a moddied frame now, plus my nsr's if the four stroke moto x lumps were as good then as they are now i would not of hesitated to put one in, cause ive gone through enough bloody nsr engines to last a lifetime.

Oh yeah you can get 490 kits for the crf's mucho torque!! and just think of that under seat pipe as well, oh yes..

luke
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Farting is funny

a pover valve motor in an nsr frame. now i like the sound of that the yamagama never interested me, not a nice bike to look at the old gamma. but a nsr now thats more like it .may have to give that a go

How big will the 350 engine go out to?
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball