rs250 barrel on nsr

**Fri Aug 24, 2007 2:34 pm » Post: #1 » Download Post**

does anybody know what nsr250 model will take a pre 1993 rs250 barrel?
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**Fri Aug 24, 2007 2:43 pm » Post: #2 » Download Post**

Hello Frogger, and welcome!

All the NSR's will take an RS barrel, but it's not as simple as just bolting it on.

You would be better off with a well tuned NSR barrel in most cases.
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Andy.
NSR-WORLD.COM

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**Fri Aug 24, 2007 2:47 pm » Post: #3 » Download Post**

its for a top secret project Twisted Evil

so a 93 rs barrel will definately fit a mc21 or mc28?
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**Fri Aug 24, 2007 2:49 pm » Post: #4 » Download Post**

It'll bolt on yes.
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**Fri Aug 24, 2007 2:50 pm » Post: #5 » Download Post**

excellent, thanks very much guys
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**Fri Aug 24, 2007 2:53 pm » Post: #6 » Download Post**

frogger_nude wrote:
its for a top secret project

so a 93 rs barrel will definately fit a mc21 or mc28?

It will bolt on, but it won't work!
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Andy.
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**Fri Aug 24, 2007 2:53 pm » Post: #7 » Download Post**

ok, so does anyone know the distance between barrel studs on each model nsr?
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**Fri Aug 24, 2007 2:55 pm » Post: #8 » Download Post**

I do. Thanks for asking Very Happy

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If I have to take the carbs off once more...

**Fri Aug 24, 2007 2:56 pm » Post: #9 » Download Post**

obviously machining and planning is required to sort it out. the main thing is that the studs line up with the barrel.
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**Fri Aug 24, 2007 2:57 pm » Post: #10 » Download Post**

You want 88~92 RS barrels and heads.

You will also need an HRC NSR crank or special HRC bearings to run the RS pistons.

Best thing you can do is buy an RS motor and tear it down. It will tell you a lot.
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Andy.
NSR-WORLD.COM

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**Fri Aug 24, 2007 2:59 pm » Post: #11 » Download Post**

My NSR/RS motor

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If I have to take the carbs off once more...

**Fri Aug 24, 2007 3:02 pm » Post: #12 » Download Post**

what parts with what? nsr bottom end with rs top or vice versa?
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**Fri Aug 24, 2007 3:05 pm » Post: #13 » Download Post**

Thats a F3 set of crank cases with F3 crank, A kit piston and mod'ed RS barrels and heads.
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If I have to take the carbs off once more...

**Fri Aug 24, 2007 3:08 pm » Post: #14 » Download Post**

was it much work to get the rs cylinder head to match the crank opening?
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**Fri Aug 24, 2007 3:08 pm » Post: #15 » Download Post**

I'll give you a tip Frogger...

Order an NSR, an NF5, and an NX5/NXA base gasket! That will only cost you £15, then you can compare the stud patterns etc.

It's not perfect, but it is cheap, easy, and quick, and will get you started!! Smile

Can you fill out your location in your profile too please?
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Andy.
NSR-WORLD.COM

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