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Dirt Bike Discussions By Brand
KTM MX & Off-Road Dirt Bikes
'99 380 cuts out at high RPM after new top end
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[QUOTE="mikromo, post: 115961, member: 19109"] Say, a couple of years ago I rebuilt my 250sx top end (96) and while I was at it I took the power valve assembly apart to clean it and replace the O rings. I got the same results as you with plenty of bottom end but nothing on top. It turns out that the power valve spring was backwards. With the end cap off and the bike running it appeared to be working, but it wasn't working right. I took my cylinder back off and took it to the dealer who showed me the way it went. Instant top end power just like b-4! Hope this helps. [/QUOTE]
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Dirt Bike Discussions By Brand
KTM MX & Off-Road Dirt Bikes
'99 380 cuts out at high RPM after new top end
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