Left side Power Vale Missing, Valid mod or not?

Discussion specific to the 1989 - 1994 (E Series) KDX200 model sold in the USA
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Kdxbrissy
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Left side Power Vale Missing, Valid mod or not?

Post by Kdxbrissy » 01:15 am Feb 22 2021

Hi All, I bought a 1991 KDX200F with adr compliance plate (Australian road registerable). Bike was running a bit smokier than expected. So I have pulled down the head and barrel. Oil was creamy from radiator fluid, I'm guessing.

1. Has a big bore kit, and the piston is marked 72mm and I'm hearing that this is the start of a sad tale because you can't get the pistons anymore?
2. The powervalve assembly appears operational, however the left side powervale is completly missing, is this a known mod?

I've already sourced a standard barrel and am going to get it replated or steel sleeved. Happy to go back to standard, just thinking I should buy the missing powervalve?

Thanks for your input.

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KDXGarage
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Re: Left side Power Vale Missing, Valid mod or not?

Post by KDXGarage » 02:04 am Feb 22 2021

Eric Gorr told me that an "E" can not be bored out and keep the power valves.

If you go back to normal, get the valves.
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Kdxbrissy
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Country: Australia

Re: Left side Power Vale Missing, Valid mod or not?

Post by Kdxbrissy » 02:11 am Feb 22 2021

Thanks for that info. I'm 50 and reliving my youth, so don't need all that extra power anyway.

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Re: Left side Power Vale Missing, Valid mod or not?

Post by KDXGarage » 02:27 am Feb 22 2021

Yeah, I hear they are sometimes finnicky with jetting and the powerband changes a bit.
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