Pistons one ring ?

**Wed Jan 16, 2008 6:40 am » Post: #1 » Download Post**

Do RS pistons have one ring,or are these HRC ?Standard has two I believe,mine has one.I was told they re CR pistons .Not too sure about that ?
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**Wed Jan 16, 2008 12:41 pm » Post: #2 » Download Post**

yes rs have 1 ring and the nsr have 2 but i had my cylinders plated again Rolling Eyes

by bdk and did good job as always and they sent single ring pistons with them but dont know if there cr or not mate
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ive seen more tarts than mr kipling

**Wed Jan 16, 2008 2:29 pm » Post: #3 » Download Post**

The "common" single-ring piston used is from an RM125. RS pistons are HRC pistons!

Not sure what machining needs to be done to fit RM pistons, but they won't be a direct replacement, that's for sure.
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Andy.
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**Wed Jan 16, 2008 2:53 pm » Post: #4 » Download Post**

i havnt had chance to use mine in anger yet because still need few go faster bits to finish her off and im always skint cos keep buying more nsrs Rolling Eyes

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ive seen more tarts than mr kipling

**Wed Jan 16, 2008 3:51 pm » Post: #5 » Download Post**

A fresh one with nothing but a wire splice and 2 holes in the airbox lid should be making in excess of 60hp -- certainly more than enough to give it a good workout! Wink

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Andy.
NSR-WORLD.COM

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**Wed Jan 16, 2008 6:39 pm » Post: #6 » Download Post**

she ran 62 with the dog fights and hrc box and harness and daytona filter Very Happy

ive fitted hrc carb kit since and got the head conversion to fit then i just need the tyga hi flo stuff then can mess around with the ramair box Twisted Evil

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ive seen more tarts than mr kipling

**Wed Jan 16, 2008 8:22 pm » Post: #7 » Download Post**

Hi...

I think these are the HRC pistons (13100-NF5-760) for the MC21...

**Wed Jan 16, 2008 8:28 pm » Post: #8 » Download Post**

NF5 is RS250.

The bore is the same but they use a 14mm pin rather than a 15mm on the NSR and also have a reduced crown hight so can't be used on stock NSR barrels.
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If I have to take the carbs off once more...

**Wed Jan 16, 2008 8:39 pm » Post: #9 » Download Post**

My mistake Stephen... In deed, these are for the RS (NF5) I should have notice that...!!!
Sorry...
mixalisen

**Thu Jan 17, 2008 3:33 am » Post: #10 » Download Post**

Is there any visual diferance between stock and RS barrels ?
_________________
My Bikes;
TZ250K
TZR250 3XV Sugo kitted track
TZR250 3XV modified road
NSR250R MC21 Rothmans
NSR250R MC18 Modified road
NS400R
Dio 80cc big bore with 26mm flatslide (wicked)
900RR Fireblade

**Thu Jan 17, 2008 7:22 am » Post: #11 » Download Post**

The RS barrel is different in every way. You couldn't mix them up. They do have one thing in common though....

Both have a 54mm hole Very Happy

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

**Thu Jan 17, 2008 7:39 am » Post: #12 » Download Post**

That s informative,thanx.
_________________
My Bikes;
TZ250K
TZR250 3XV Sugo kitted track
TZR250 3XV modified road
NSR250R MC21 Rothmans
NSR250R MC18 Modified road
NS400R
Dio 80cc big bore with 26mm flatslide (wicked)
900RR Fireblade