Maintenance & Technical > KX500 Original

What size piston to buy?

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cbxracer30:
You should have someone run a hone through it , this should take away the discoloration .CBX

dave916:

--- Quote from: oic0 on June 04, 2010, 09:51:33 AM ---B2, I don't know. Someone told me it looked like the plating was starting to wear away at the exhaust port? I'm new to the plating thing, ive always had sleeves so I'm a total noob to this.


--- End quote ---
not sure if that it is the pic but it look like there could be a crack  between the RH exhaust subports
may also want to check the kips valves  as the centre valve looks very much to one side
if the barrel is worn you would usual find a lip about 10mm from TDC [where the rings stop] will be worse on exhaust side
not sure if you have seen this http://www.hallbergs.net/kx500/

oic0:
Yeah the kips rattles all over the place. I rotated the pins and it helped some. Its still noisy though. Tempted to have it welded.  When its out I can't see anything physically wrong with it or worn, not in its place in the cylinder either.

tschisi:
I?ve got a similar question.
I?m not planning to re-plate my cylinder or change my piston because both surfaces look fine and the bike ran good.
But i measured the gap between cylinder and piston with a feeler gauge like this:
http://img690.imageshack.us/img690/6742/gapu.jpg
(maybe not meaningful, i know) and it is 0,15mm.
Could that be ok?

oic0:
I'm a noob too but I think you're measuring at the wrong end ;) . I gave up on trying to measure mine and figured if its making good compression and the skirt isn't beat up then its probably alright.

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