SOHC.co.uk Forums > CB750

ART Pistons

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Seamus:
Hi All,
I have been cleaning things up and noticed that my pistons are not flat, but domed with cut outs for the valves. The pistons are marked ART by the gudgen pin. A quick measure gave me around 63.5mm
This is above the 1mm Honda info.
Could this be part of an aftermarket kit? Any info appreciated.
I guess someone has been playing with my internals.

Cheers

Seamus

Bryanj:
ART actually made most of Hondas pistons but also at 63.5 its an overbore kit, could be cb350 pistons

Seamus:
Thanks Bryan. These pistons do not have any other marking except the ART initials by the gudgen pin. I thought that all Honda pistons were marked with "ex" or similar on the crown. There are no markings on the crown (that I have found so far).

Appreciate the thoughts though. A search seems to suggest that all sorts of pistons get used in threse engines.

Cheers

Seamus

Bryanj:
Only pistons that have to be fitted one way round have any markings like you describe and if you go to our sister site, sohc4.us you will find all sorts of attempts to fit different pistons to get more cc, which is the easiest way of getting, as Tim Taylor would say, More Power!!!

SteveD CB500K0:
You'll need to go to sohc4.net as the .us site has been closed for a while.

There are a bunch of guys on there who are seriously into upgrading these engines.

For that sort of money, I'd go buy a FireBlade! (trust me, I've ridden a few and they are awesome!)

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