Piston identification help ?

**Mon Aug 08, 2011 7:48 pm » Post: #1 » Download Post**

Hi all,

Wondered if someone can tel me which pistons these are ?

54mm bore, same piston pin as nsr. Flat tops.

Maybe from NF5 or NX5 ?

Its got the following stamped inside : ART 8C27

Thanks
Mario

**Mon Aug 08, 2011 8:20 pm » Post: #2 » Download Post**

If it has a 15mm piston pin then it not an NF5. I'v not seen a crank case inducted RS motor with a piston ported type piston between 1987-1992.
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**Mon Aug 08, 2011 9:00 pm » Post: #3 » Download Post**

Stephen is right... Either are not from an NX5 or NXA... Even the "A" kit pistons from HRC or JHA for these bikes are not ported...

**Mon Aug 08, 2011 9:03 pm » Post: #4 » Download Post**

ND5?
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**Wed Aug 10, 2011 8:05 am » Post: #5 » Download Post**

Thanks for the help guys, whats a ND5 ?

**Wed Aug 10, 2011 8:36 am » Post: #6 » Download Post**

Mario hi,

ND5 is the Honda RS250 but before NF5's... Although i checked my parts lists of the ND5 machines and i sew also that the pistons don't have any ports...

Cheers Mario
Michael

**Wed Aug 10, 2011 11:43 am » Post: #7 » Download Post**

I believe nd5 had a bore of 56mm.
Looks like an old KTM or Honda Cr125 piston to me.
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**Wed Aug 10, 2011 2:46 pm » Post: #8 » Download Post**

Thanks again for all the help guys !

Michael - ND5 = before my time, LOL !!

Maybe pistons from CR125 that someone wanted to use in their NSR motor as I got these with a pair of bikes I bought.

**Thu Aug 11, 2011 10:31 am » Post: #9 » Download Post**

Alzazorq wrote:
Michael - ND5 = before my time, LOL !!

Damm, i wish i could say the same Mario...!!! Crying or Very sad

**Thu Aug 11, 2011 10:13 pm » Post: #10 » Download Post**

The port in the rear skirt identifies the piston as a CR125, the comp height will define the year