I'd love to try this....

[Rich250RRacer]

I've seen these motors pop up on ebay once in a while and thought it would be really different to put in a 250R chassis. Since it's a twin, there should be no vibration issue. AND it would still be a 250R :D

http://cgi.ebay.com/Honda-NSR-250-MC21-Engine-NSR250-RS-TZ-RGV-TZR-NO-RESRV_W0QQitemZ200138832877QQihZ010QQcategoryZ3559 5QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

[04blasterkid]

wow, never seen a motor like that, but if you could fab that in it would be killer, 250r twin:eek2:

[250Renvy]

I've thought about this as well.

It would be really hard to rig that motor into a quad without knowing how everything goes.

These bikes were supposed to be super expensive - $25 - 50K

But I saw one in the trader a while back for $4500. There is also a NSR500. I think in 2004 or possibly 2006 they came out with an updated, last run of them before axing them completely.

I'm not sure how this would translate for a quad, but the NSR 250R is a 288lb bike with a top speed listed as 130mph so add the extra weight and it might even out with a big bore motor.

[zedicus00]

the nsr 500 was a v4, and was a race bike only. never made a street bike variant. the 250 was a vtwin like shown. theres a guy in another forum with one in a 250R drag chassis. they actually make big bore kits for them and stuff... supposedly hes doing over 100hp with 2 modded cr125 jugs with big bore kits and custom porting.

[fireburns99]

it owuld definitely be interesting to see the dimensions of the engine. It would take a LOT of creativity in order to route the pipes. But it would be a really unique R. If i had the time and a spare frame laying around i would deifnitely try it!

[Aceman]

Come on Rich........you only live once!

If I did it, I'd be looking into resleeving the cylinders and getting up to the 400-500cc range. Shouldn't be too extreme considering you have two cylinders to open up and not just one hogged out cylinder. With a good port, that twin cylinder setup would probably have awesome power delivery! Mocking up the exhaust pipes could get a little tricky though.

[Rich250RRacer]

The exhaust would be tough to do, and I SURE this wouldn't be a woods quad. I'm thinking power delivery alot like a Banshee.

[fireburns99]

Yea the exhaust would definitely be the toughest part. But it would sure make a nice dune machine.

[x.system]

That motor swap has been done in a 250R but I can't remember the guys name that has it, I'm pretty sure he's a memeber here. I know he's in MI. I think he's got it in a drag chassis.

[250R-Dee]

The TOP DOG 200+hp 4cylinder RS500 would be more fun:D

[Scott-300ex]

Im thinkin 330+330 :D

[blb515]

Originally posted by x.system
That motor swap has been done in a 250R but I can't remember the guys name that has it, I'm pretty sure he's a memeber here. I know he's in MI. I think he's got it in a drag chassis.

The guy goes by genoapb heres a link to a picture of his bike:

http://trx250r.org/forums/index.php?showtopic=1086

[TheFontMaster]

Yea I been wanting to do one of those swaps for a while. It looks like the main bearings went out on that engine. My 250r piston and domes looked just like that when I blew my engine.