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400 ex update

This is a discussion on 400 ex update within the ATV/UTV - General Discussion forum, part of the ATV/UTV Forums category; WOW, $500! that's a steal! If you intend on leaving the piston and CDI stock I would do a bottom-mid ...

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Old 06-21-2006, 08:39 AM
Kev_CR's Avatar
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Join Date: Sep 2004
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Location: Lake Point, Utah
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Default Re: 400 ex update

WOW, $500! that's a steal!

If you intend on leaving the piston and CDI stock I would do a bottom-mid end cam like the HotCams stage 1 or a XR400 cam. If you are keeping with the stock bore/compression piston I'd buy the XR400 head and base gaskets. The XR gaskets are a bit thinner and will 'up' the compression a bit and also make the burn more efficient.
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