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hello all, i have a 93 kdx 200 i am rebuilding. it has a cylinder that measures 72mm (standard being 66mm). it is sleeved and recently nicasiled. having trouble locating a 72mm piston. i know this sounds odd but the old piston was 72mm and cyl was just sleeved. during rebuild i had the scarred cyl nicasiled and now cant find a piston. any help would be greatly appreciated

I think someone else was looking for one just a week ago. Look back a few threads.

Welcome to the forums and good luck.

By the way, do you have the power valve system? I was once told by a highly skilled tuner that the power valves would not work with the 240 kit (I assume that is what you have). Thank you.

Can you locate a part number on the old piston?

@kdx rider I searched high and low for a piston to fit a 1990 KDX200 with the 240 big bore kit. Cylinder measured 72mm. I talked to Wiseco who originally made the piston for LA Sleeve and was told they quit making it in 2005. LA Sleeve doesnt have one laying around. I spoke with Eric Gorr and the folks at Kustom Kraft and they recommended finding a used stock cylinder. Easier said than done, but I tracked one down and ordered it Tuesday.

I looked also for a 72mm piston with similarish specs and the closest I got was a 1984 KX250 piston, but it runs an 18mm wrist pin, so you would have to replace the wrist pin bearing with a thin bushing or have the piston bosses bushed down to 16mm.

The cylinder I ordered comes with piston and power valves. I am crossing my fingers that nothing is missing. Best of luck!

i will see if i still have the old piston to check for a part number. thanks for the replies. looks like the 18mm wrist pin is going to be the problem