1984 kdx200 how can the cylinder be replated to 68.5?

[freightwrench2]

I have this old 1984 kdx200 and I found a piston an oversized piston and was wondering if anyone new if the cylinder can be taken to 68.5 from the std 66 with a replate. thanks for the help freight

[OLHILLBILLY]

Cylinder would have to be bored out to the 68.5, which is probably not possible. Don't know that much about the early KDXs, but the newer ones have a 66.1 wear limit and can't be bored (unless you're going to sleeve it). Issues with exhaust valve clearances and such. Get a piston to fit the cylinder instead of trying to get the cylinder to fit the piston. ?

[SS109]

IIRC, the '84 has no power valve to deal with and I think those cylinders weren't plated back then. A rebuild in the pre-plated days consisted of boring the cylinder and adding an oversized piston and rings.

[zz3gmc]

They were plated back then. Kawasaki has been plating their cylinders (electrofusion) on the KXs since the early 70s. Our 75 KX250 cyl.

is plated.

[freightwrench2]

guess its time to talk to millennium. the bike is in really good shape and if I can get the top end I would be done.

[SS109]

They were plated back then. Kawasaki has been plating their cylinders (electrofusion) on the KXs since the early 70s. Our 75 KX250 cyl.

is plated.

 

I know the KX's had it but I'm not sure the KDX had it before '89. Back to the original question, if the KDX that year had the plating, and the cylinder has enough material you can bore it that far, you could overbore it and then have it plated.

[zz3gmc]

Ive had/have several 84 200s and they are plated.  I bought one brand new in june of 84 and my current 84 is plated. Also had a 84 KDX250 and it was plated. Whats a 240 kit bore go out to? I know they had them for the 200s back then.

[zz3gmc]

Call up Fredette Racing Products and speak to Jeff. I heard that you can use a piston from a newer KDX200 as a replacement. I believe the bore and stroke remained the same throughout the years. If its the original plating you may want to think about getting it replated to be safe. My 84 project is thin in spots.

[SS109]

Ive had/have several 84 200s and they are plated.  I bought one brand new in june of 84 and my current 84 is plated. Also had a 84 KDX250 and it was plated. Whats a 240 kit bore go out to? I know they had them for the 200s back then.

 

Thanks for for the info!

[freightwrench2]

called Jeff. sending the new 68.5 pistion and cylinder in the next few days lets see what we get back. thanks for the help!

[KDXGarage]

I am pretty sure that all full-sized USA KDX's had Electrofusion coating.

Edited June 14, 2014 by KDXGarage

[freightwrench2]

its definatly coated. my question being can this 1984 kdx200 cylinder be sized to 68.5? I have a wiseco piston that's supposed to fit it. Jeff says send it.