Maintenance & Technical > KX500 Original

What size piston to buy?

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oic0:
I can buy my own piston for ~$60 cheaper than the plating service will sell me one, but size which one do I buy? I'm new to the plated cylinder thing. Since they add material and the actual cylinder isn't worn down, do I just buy the same size as I had? My bore isn't damaged, just getting shiny around the exhaust port.
*note* yes thats black paint like stuff, its all inside my intake tract and ports. No I don't know why or who did it, maybe thermal insulation for the intake charge or something? who knows*

Roostmad1:
yes go for standard size,before you put your new piston and rings in scotch brite the cylinder liner to take any glaze of so the rings will seat in properly,but when you do it make sure its in a criss cross pattern,goodluck

B2:
In the consensus of the group, does the cylinder even need replating?  The cross hatch is visible and does not appear to be flaking. 

I am working on a bike that had a loose exhaust which caused dirt to get sucked into the cylinder.  Looking through the exhaust port, it has vertical striations on the cylinder wall.  I thought I would Scotchbrite it in a crosshatch and see how it looked afterward.  If it appears okay and the piston looks good, why not just re-ring it and run it?  Thanks, Kenny

oic0:
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.

bigbellybob:

--- Quote ---I can buy my own piston for ~$60 cheaper than the plating service will sell me one, but size which one do I buy?
--- End quote ---
just another reason why its not to bad to get the piston from the platter. like i said in you other thread they will need the piston to size the bore correctly if you send them an over size piston the jug will get set up for that piston. IMO get the standard size.


I also don?t break the glaze on my cylinder. New rings in the shiny bore tell its time for a replate. And it always seals back up just fine. Didn?t Stewart test deglazed against non-deglased bores sometime back?

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