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NSR 125 Piston sizes

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Rncv
Nitrous Nuisance



Joined: 22 Jun 2011
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PostPosted: 20:43 - 24 Aug 2014    Post subject: NSR 125 Piston sizes Reply with quote
Hi,

Currently rebuilding a Honda NSR 125 for my cousin. I've got the engine apart here and I'm looking to order a new piston.
I've read different stories in different places about what size piston ect ect.

There are 5 different pistons to choose from, A B C D & E.

This corresponds to a letter stamped on the barrel. I guess that the barrel I have is a D type by what is stamped below the exhaust port?

https://i61.tinypic.com/10xr1o1.jpg

If this is the case, when ordering pistons through wemoto they only offer a 54mm and oversized ones which doesn't correspond with the 53.961mm for a D type Rolling Eyes

Any help would be much appreciated! Thumbs Up
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 20:59 - 24 Aug 2014    Post subject: Reply with quote
Hi

The piston sizes Honda list are for accurate clearance. Wemoto are listing over size pistons (which is a bit strange as the NSR has a plated bore so cannot be rebored, unless modified with a steel liner fitted). All the sizes Honda list are equivalent to the standard piston size (ie, aftermarket they are not caring about the exact clearance).

All the best

Keith
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Rncv
Nitrous Nuisance



Joined: 22 Jun 2011
Karma :
PostPosted: 21:08 - 24 Aug 2014    Post subject: Reply with quote
Kickstart wrote:
Hi

The piston sizes Honda list are for accurate clearance. Wemoto are listing over size pistons (which is a bit strange as the NSR has a plated bore so cannot be rebored, unless modified with a steel liner fitted). All the sizes Honda list are equivalent to the standard piston size (ie, aftermarket they are not caring about the exact clearance).

All the best

Keith


Thanks for the reply,

Would a piston from wemoto suffice? even though its 0.04mm bigger or would it be better of to get a piston from honda?

Cheers.
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 21:48 - 24 Aug 2014    Post subject: Reply with quote
Hi

Not sure what size it is. Seems to be just listed as standard without saying which standard.

The min size of an E piston (smallest) from Honda is 53.956 and the max size of an A piston is 53.980. So the that range is 0.024mm

All the best

Keith
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alains
World Chat Champion



Joined: 08 Jul 2004
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PostPosted: 10:01 - 26 Aug 2014    Post subject: Reply with quote
go to https://www.davidsilverspares.co.uk
they have all you need to rebuild your top-end
piston D ref : 13104 KY4 901 (~£40)
i've got all spares refs , if you need it send me a pm
with it you need : rings,piston pin,clips,small end bearing,oil seal(valves shaft),base cylinder seal,head gasket
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