Maintenance & Technical > KX500 Original

What size piston to buy?

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oic0:
Just to verify, it does look like it needs plating right? from the shinyness? (hard to see in the first pictures, but in the third and in person, around the exhaust port is shiny)

meangreen500:
mine looked like that I took it to a friend we gave it a quick hone and it looked great. I did get the .5 mm over size and have been running it for a while. I wouldnt spend the money on that cylinder unless the chrome comes off in small chunks or is out of round. :-D 

oic0:
I guess I'll just throw it back together and ride then after I get the mud out of it. Bought some kerosene. Going to fill the bottom end with that. work it all around, flush it, repeat, etc... When it was together it made a little over 165psi compression.
Already cleaned up the reeds and cylinder. Need to do the carb and bottom end, then find the airbox problem that let this happen in the first place! (soon as I get that bird nest out of there, I feel bad though, it has eggs :( )

cbxracer30:
The black "paint" inside the transfers & intake is a factory coating they all come with , it will come off and isn't hurting anything.CBX

oic0:
Guess that means my cylinder must be on the original plating.

Found the culprit that caused the mud ingestion. The plastic ring that clamps the filter rubber tube to the air box was warped, also someone put it back together with a thick washer on only one bolt.... Ordered a new one and also when I put it back together I'm going to use silicone for peace of mind.

Before I start putting it back together, everyone agrees the bore looks safe?
How thick is this plating stuff anyway? Like in my last picture up there in the exhaust port where you can see two colors where its cut away for the port, is the darker color how thick the plating is? is it really that thick?

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