Costin - NSR500 1994 Doohan bike

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Questo vecchio rz
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Re: Costin - NSR500 1994 Doohan bike

#16 Post by Questo vecchio rz » Sun Oct 18, 2015 7:30 pm

Awesome project!
As for the 2-1 carbs? Here in the states Ive seen dozens & dozens of 2-1 Trinity carb conversions on Banshees.
All worked reasonably well, as usual some jetted great, others not so much...lol. Some guys claim less topend but more lowend grunt ? Most were running a airstriker 35mm carb.
With dual top shelf magnesium 41s topend performance might just be no problem. Only one way to find out, do what no one else has tried! You certainlly know how to tune a 2-stroke just as good as anyone..wishing you & your customer the best of luck and the biggest of smiles!
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Mick C
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Re: Costin - NSR500 1994 Doohan bike

#17 Post by Mick C » Mon Oct 19, 2015 6:52 am

Thanks for posting those pages up Steve, I never saw the 2nd issue....it's great how Stan rights about what he does and how he does it.

I think every 2 stroke fans dream bike would have been a Honda V4 road bike or a Yamaha 3ma version of their V4. Maybe a project for the future.

And I totally agree with Questo Vecchio, only way to find out is to give it a go!

Cheers
Mick

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Ax-Racing
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Re: Costin - NSR500 1994 Doohan bike

#18 Post by Ax-Racing » Mon Oct 19, 2015 9:35 am

beautiful frame Mick !

You're right about small differences in engine mounts, but the look is wery similar and evocative.
can't wait to see the bike assembled.
Alex

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hybrid
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Re: Costin - NSR500 1994 Doohan bike

#19 Post by hybrid » Thu Oct 29, 2015 7:25 am

Ok, so there is a lot involved in fitting the 350 cylinders. Not something to consider unless absolutely necessary.
Although I do have a spare set of crankcases :supz:

RC45
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Re: Costin - NSR500 1994 Doohan bike

#20 Post by RC45 » Wed Nov 04, 2015 3:15 am

I have been waiting to see this bike running - it will be inspiration for me to finish the 784cc V4 project I procured from Mark Brown.
CBR1000RR SP2 HRC WSBK
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Mick C
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Re: Costin - NSR500 1994 Doohan bike

#21 Post by Mick C » Mon Nov 16, 2015 3:10 am

Swingarm....

Image

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Nice and pretty before heat treatment.

Mick C
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Re: Costin - NSR500 1994 Doohan bike

#22 Post by Mick C » Mon Nov 16, 2015 3:31 am

rear-sets, shock adjuster nut and some axle nuts... the NSR500 Honda rear-sets were never overly complicated, especially compared to the YZR's of the mid to late 90's

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Rear shock is from a Honda RS250 GP bike

Image

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Smoker
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Re: Costin - NSR500 1994 Doohan bike

#23 Post by Smoker » Mon Nov 16, 2015 5:37 am

Very few coils on the rear spring.

Titanium spring?

Nice parts! :smt004

Mick C
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Re: Costin - NSR500 1994 Doohan bike

#24 Post by Mick C » Mon Nov 16, 2015 8:50 am

Hey smoker,

Standard RS250 shock and spring...no doubt the spring will be too soft and Ill be swapping it out later once its all finished.. I have a pic of a NSR500 shock Ill dig out and post. From memory it had large spacing on the coils as well....

Cheers
Mick

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Re: Costin - NSR500 1994 Doohan bike

#25 Post by Mick C » Wed Nov 18, 2015 6:37 am

Here is a pic on an 1996-98 NSR500 shock. The RS250 shock is very different but still looks similar, so she'll do..

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Here is frame and swingarm in early mockup....

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in early roller form....ducati showa forks, HRC front wheel with racing discs, brembo goldline calipers, and CBR900 rear wheel

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Cheers
Mick

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Re: Costin - NSR500 1994 Doohan bike

#26 Post by rd84 » Wed Nov 18, 2015 8:25 am

Nice work !

Cheers
Paul

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Ax-Racing
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Re: Costin - NSR500 1994 Doohan bike

#27 Post by Ax-Racing » Wed Nov 18, 2015 9:19 am

beautiful !
Alex

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wolfgangh
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Re: Costin - NSR500 1994 Doohan bike

#28 Post by wolfgangh » Wed Nov 18, 2015 11:15 am

Hello Mick,
what firing order is this engine running - are opposed cylinders at TDC at the same time, or 180° apart as for stock engines? I think this would make the carb configuration work better if both cylinders fed by the same carb are in phase.

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jackson.40
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Re: Costin - NSR500 1994 Doohan bike

#29 Post by jackson.40 » Wed Nov 18, 2015 1:16 pm

WOW! :smt007 :smt007

Top work Mick :cool:

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Ax-Racing
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Re: Costin - NSR500 1994 Doohan bike

#30 Post by Ax-Racing » Wed Nov 18, 2015 1:26 pm

wolfgangh wrote:Hello Mick,
what firing order is this engine running - are opposed cylinders at TDC at the same time, or 180° apart as for stock engines? I think this would make the carb configuration work better if both cylinders fed by the same carb are in phase.
interesting question
but you have to consider that enghie has 4 reed valve, so every cylinders could work with their own phases
Alex

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