SOHC.co.uk Forums > CB500/550

DSS .25 pistons not correct size

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eight0:
I just went to pick up the Cylinder Block from the machine shop having instructed them to bore to 1x oversize to .25mm.

I bought a piston which arrived from DSS yesterday and asked if he could just double check the measurements. He said the piston was actually '1thou' bigger than it should be.
He suggested I send the rest of the pistons over so he could bore to the correct size for each cylinder.

Are these pistons known to be a bit rubbish? They did have Chinese lettering on the box. Not sure what do do, do I sent the DSS ones back and buy a different set or just send all the pistons to the machine shop?

McCabe-Thiele (Ted):
Trigger is your man for the best way forward.

ka-ja:
I always had rebores done to suit already purchased piston sets, with each bore machined to match a chosen/numbered piston, even a matched new piston set each piston can vary in size to each other,  micrometer wise

philward:
Cruzinimage on ebay (they are Japan based) have a good reputation - I have used 2 sets with no problem - Trig will be along shortly I imagine with appropriate recommendation!

taysidedragon:

--- Quote from: ka-ja on November 04, 2020, 04:36:04 PM ---I always had rebores done to suit already purchased piston sets, with each bore machined to match a chosen/numbered piston, even a matched new piston set each piston can vary in size to each other,  micrometer wise

--- End quote ---

Exactly. That's the only way to do it.

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