PE Portfolio [NSR250R MC21SP Rothmans]

**Wed Nov 27, 2013 11:42 pm » Post: #1 » Download Post**

This MC21SP was bought to us after a catastrophic crankshaft failure. The motor has been rebuilt and tuned to our NSR-WORLD SP spec, and the chassis given a general tidy up, with many of the fixings and fittings refinished.

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Andy.
NSR-WORLD.COM

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**Sun Dec 01, 2013 6:43 pm » Post: #2 » Download Post**

Due to the nature of the rebuild, the motor was only gently run on the dyno, just for setup purposes.

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Andy.
NSR-WORLD.COM

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**Sun Dec 01, 2013 9:26 pm » Post: #3 » Download Post**

Very nice. Lovely carbon wheels on the NXA too Very Happy

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If it ain't broke, fix it until it is.

**Sun Dec 01, 2013 9:27 pm » Post: #4 » Download Post**

Good job lads....

Blimey my arse looks sexy in the third but last photo Very Happy

**Sun Dec 01, 2013 9:42 pm » Post: #5 » Download Post**

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Andy.
NSR-WORLD.COM

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**Sun Dec 01, 2013 9:50 pm » Post: #6 » Download Post**

Nice, what pipes are they?

**Sun Dec 01, 2013 10:08 pm » Post: #7 » Download Post**

simono wrote:Good job lads....

Blimey my arse looks sexy in the third but last photo

I might have known.... Rolling Eyes

MC21 - Beautiful! Very, very nice.
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If it ain't broke, fix it until it is.

**Sun Dec 01, 2013 10:10 pm » Post: #8 » Download Post**

New spec Tyga's Simon. We'll adjust the set up once the engine run in and see what they can produce.
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If I have to take the carbs off once more...

**Mon Dec 02, 2013 12:10 am » Post: #9 » Download Post**

Looks a beauty,
You guys certainly know what your doing.
Daz
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stink wheels forever.

**Mon Dec 02, 2013 7:47 pm » Post: #10 » Download Post**

Really great job Guys.
The bike is so original, it's begging for some tuned chambers in 'flat back' and some open 'Ally' cans!
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30

**Tue Dec 03, 2013 5:30 pm » Post: #11 » Download Post**

We've done black Tyga pipes on other rebuilds and it works well. However the only new spec Tyga's we could get were stainless steel for this rebuild.
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If I have to take the carbs off once more...

**Wed Dec 04, 2013 5:51 pm » Post: #12 » Download Post**

That looks nice, makes healthy power as well.

Out of interest what does a ss tune involve? Is it just porting or do you do work on the cases and heads as well?

**Wed Dec 04, 2013 7:07 pm » Post: #13 » Download Post**

SS spec is the same as SP but without the crank case work and some fine details.

This motor was built to SP spec and shoudl see 65-66hp once its run in and set up. When it was dyno it had done zero miles since its full rebuild so caution was taken with the jetting and the amount of full throttle runs it was given.
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If I have to take the carbs off once more...

**Sat Jun 21, 2014 12:43 am » Post: #14 » Download Post**

The MC21SP came back in today with a few miles under its belt for a service and final setup.

Maybe time for a 38T rear now...

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Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

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