NSR 250 swop out to Rz 350
Moderator: rztom
NSR 250 swop out to Rz 350
Hi all
I have the opportunity to buy a NSR 250 mc 18 full rolling chassis (sans engine) and would like to swop out the front and rear of my spare '83 Rz 350 project. I have hunted through the forum and can't find any real reference as to whether it will fit or not. Some individual sites mention that the front end is nearly a bolt on, but wondering about the rear.
Anyone have experience doing this kind of conversion or could possibly point me in the direction of a post that covers this?
Thanks
Grant
I have the opportunity to buy a NSR 250 mc 18 full rolling chassis (sans engine) and would like to swop out the front and rear of my spare '83 Rz 350 project. I have hunted through the forum and can't find any real reference as to whether it will fit or not. Some individual sites mention that the front end is nearly a bolt on, but wondering about the rear.
Anyone have experience doing this kind of conversion or could possibly point me in the direction of a post that covers this?
Thanks
Grant
Re: NSR 250 swop out to Rz 350
No experience personally, but unless it's just completely undo-able due to size I'd go the other way and put the RZ motor in the 250 unless there are registration problems. Probably a much better frame
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Re: NSR 250 swop out to Rz 350
No clue fitting the swinger, its a matter of sizing it up. As vespaman said though, why would you not try and put the 350 motor right in the NSR roller? It would be a much better chassis package. If you see one of my other posts I am looking to do something similar to that.
If you do decide not to use the main frame, please shoot me a message, I would be happy to take it off your hands.
Cheers,
Evan.
If you do decide not to use the main frame, please shoot me a message, I would be happy to take it off your hands.
Cheers,
Evan.
Re: NSR 250 swop out to Rz 350
I certainly have considered it, it's going to be a pure track bike, so registration is not an issue. I am fairly tall and have heard the NSR is quite a small frame whereas the Rz is a nice size for me.
I read somewhere that the Rz engine is too long for the NSR frame, but yes would defo consider this as well
I read somewhere that the Rz engine is too long for the NSR frame, but yes would defo consider this as well
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Re: NSR 250 swop out to Rz 350
Gotcha. Well let me know on that frame Granto! I have a spare NSR swinger sitting around over here... :)
Re: NSR 250 swop out to Rz 350
Sorry man, would be happy to sell the frame to you, but am based in South Africa, so I think courier fees alone would be outrageous :)
- gammaguy21
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Re: NSR 250 swop out to Rz 350
I've recently seen a picture of a rz350 with a nsr250 mc21 swingarm.
I know that the nsr mc18 r2j/k is about 7 mm shorter at the pivot (198 mm)... so my guess is it should fit.
For the front, the steering stem on the mc18 is almost the same dimensions as a rgv250 vj22. It's a couple of mm taller and about 7mm wider at the top of the stem where the top bearing would sit.
Fork wise, the mc18 is about 1/4 inch shorter than the rgv vj22 forks. Seen lots of rgv vj22 front end swaps on the rz, so I think the nsr front end could possibly work.
Back about 2007, martin77 (2 stroke pipe builder) put a rz350 engine in a nsr250 mc21 chasis.
He said that the nsr front mounts need to be cut off and a cradle fabricated for the rz engine. Also the rear engine mounts needed to be relocated.
However the mc21 is slightly bigger than the mc18. The mc18 is a narrower frame, so the rz engine would be a tighter fit in the mc18 frame and may not work.
Here's martin77 nsrd350
Hope this helps.
I know that the nsr mc18 r2j/k is about 7 mm shorter at the pivot (198 mm)... so my guess is it should fit.
For the front, the steering stem on the mc18 is almost the same dimensions as a rgv250 vj22. It's a couple of mm taller and about 7mm wider at the top of the stem where the top bearing would sit.
Fork wise, the mc18 is about 1/4 inch shorter than the rgv vj22 forks. Seen lots of rgv vj22 front end swaps on the rz, so I think the nsr front end could possibly work.
Back about 2007, martin77 (2 stroke pipe builder) put a rz350 engine in a nsr250 mc21 chasis.
He said that the nsr front mounts need to be cut off and a cradle fabricated for the rz engine. Also the rear engine mounts needed to be relocated.
However the mc21 is slightly bigger than the mc18. The mc18 is a narrower frame, so the rz engine would be a tighter fit in the mc18 frame and may not work.
Here's martin77 nsrd350
Hope this helps.
- Questo vecchio rz
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Re: NSR 250 swop out to Rz 350
Ive viewed 2 NSR250s with RZ YPVS engines in their frame, it can be done.
I understand your notion of a 250 being quite small..they are tiny bikes. I'm 6'1" and 198 lbs look & feel utterly ridiculous riding one...lol.
As far as front end swapping out, the NSR250 is almost a bolt on affair from what Ive seen. Here is a basic "copy & pasted" primer. Honda NSR250 (MC21 or MC18) complete front-end and calipers, almost a bolt on! You will need a 1/8" spacer below the bottom bearing to clear the frame. Ream out your top RZ bearing 1mm to adapt it to the larger NSR stem, add a upper spacer between top crown and bearing. Done! NOTE: You must use RZ tapered bearings.The rear is unkown to me, but Probably doable with some fabrication. Im sure someones tried it.
I understand your notion of a 250 being quite small..they are tiny bikes. I'm 6'1" and 198 lbs look & feel utterly ridiculous riding one...lol.
As far as front end swapping out, the NSR250 is almost a bolt on affair from what Ive seen. Here is a basic "copy & pasted" primer. Honda NSR250 (MC21 or MC18) complete front-end and calipers, almost a bolt on! You will need a 1/8" spacer below the bottom bearing to clear the frame. Ream out your top RZ bearing 1mm to adapt it to the larger NSR stem, add a upper spacer between top crown and bearing. Done! NOTE: You must use RZ tapered bearings.The rear is unkown to me, but Probably doable with some fabrication. Im sure someones tried it.
Banshee (Baja) race bike,+ 2 A Arms,L.E.Ds, Toomey, +4 stroker IMS tank, run flats.
96 GSXR SRAD, Future Yoshimura rep.
85 custom Tri-Z
RZ/YZR bike(project)
86 VFR750 RC24 Merkel replica (project)
Royal Enfield Bullet 500
96 GSXR SRAD, Future Yoshimura rep.
85 custom Tri-Z
RZ/YZR bike(project)
86 VFR750 RC24 Merkel replica (project)
Royal Enfield Bullet 500
Re: NSR 250 swop out to Rz 350
Tx guys, going to possibly pick the NSR frame up tomorrow morning, will do some basic measurements before pulling the trigger, will let you know how it goes
Re: NSR 250 swop out to Rz 350
So checked out the frame over the weekend and all preliminary measurements looked like it would work, so I bought the chassis. Took it and the rz apart, fitted the pieces up in a rough mockup and everything seems to fit for the most part. Still have to check alignment for the chain, but it's looking very promising. Will start up a project thread this weekend and let you guys know how I get on.
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Re: NSR 250 swop out to Rz 350
Awesome! Make sure to post pictures and hopefully some direction for anyone giving it a shot in the future!