KDXRIDER.NET

I hear people on here talking about the cylinders and plating on the KDX. I am going to be taking a look at mine and how will I know if it needs to be replated? I have always either replaced rings or had it bored over when rebuiling top ends. This plateing is new to me. If the cylinder looks ok do I just replce with new rings or piston and rings if it is out of spec?

If the plating looks good, just 'deglaze' the cylinder with some WD and scotchbrite(actually do this first, and you'll get a good look at the plating)...Install new piston/rings.

post good pics in there if you're not sure.

Depends what year. The earlier ones had electro-fusion bores.... effectively, steel welded into an aluminum bore. If you bore those, you have a plain aluminum bore, that's way too soft for use. The only real choice with those is to bore them out to take a sleeve, then bore the sleeve to the correct diameter for the new piston and rings. You end up with something like a new cylinder, but it's expensive.

I think you're in more or less the same situation if you bore Nikasil, but I'm not sure.

you rarely need to bore out and put a sleeve unless the cylinder has some real deep gouges and can't be stripped and replated.
I'd say 99 % of the time the plating is worn and the aluminium is good underneath. strip and replate is all you need, good as new.

If the plating is worn, send ti to a reputable place. They will bore it and lay the right amount of chrome/nickel/whatever back down. They all request a piston to be sent with the cylinder. I would recommend against an iron sleeve.

well I had ashop look at it and even though it looked pretty good and compression was 145 it had a slight edge around the bottom of the cylinder so i had him send it to mulinium I beleive. The guy at the shop said he has ben using them for a long time and the do good work. I could have prob got buy with replacing the rings but I have the top end off might as well do the things I want now instead of later

millenium.
As long as it's NOT "US chrome" you're good.

Well, you're plating will be good for MANY pistons now.

scheckaet wrote: As long as it's NOT "US chrome"

No doubt! I have a cylinder plated by them but I think I'm not going to use it. I think I'm going to send my original cylinder to Millennium to get it done right.