Maintenance & Technical > KX500 Original

New top end

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medicman:
Hey guys forgive my retarded question. I had my top end sleeved a few years ago (i know dumb), I seezed the original piston at glamis a few years back and did the rebuild my self. I just ordered a Kx500 piston an put it in. The bike ran good. I recelty seezed the bike again (lost compression) so....my question is do I need to measure the cylinder and find the right size piston or can I just order the standard size/stock piston. I know I can have the cylinder bored, but then I would need a larger piston correct? You guys rock thanks for the helping a newb :-D

sandblaster:
I have rode several sleeved bikes.
I always warm them up very gently, I have them jetted correctly, and run a quality 40:1 mix.
They will usually last a good long time.
Yes, I would rather get one chromed.
In your case you need to know how bad the damage to your cylinder is.
If it is normal galling then chances are you could go 1 size over and be fine.
If it has scoring or pitting then you have to know what size it will be after the damage has been machined out.
Many shops will not even bore your cylinder unless they have the piston you are going to run in it so that they can be sure to bore it to the correct size.
If your going to have it bored locally I would take it in with a list of oversized pistons that are available and ask them what size to get.
I'm sure they will be happy to help you.

medicman:
Thanks for the info brother! Ill see what the shop says. I live by pro circuts shop, am gonna take it there.

sandblaster:
Perfect  :-D

Polar-Bus:
I believe you are not supposed to run OEM rings (which are designed to run with a nikasil type plated cylinder.  To my understanding sleeves are made of cast iron, and can be re-bored as needed, but you also need to run a piston ring that is designed for a softer cast iron liner ? Do you have a sleeve installed that's been previously chromed ?

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