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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="burtlamborn, post: 116042, member: 21044"] Thanks for the tips. I called Wiseco and there is only one piston available. According to Wiseco, the skirt differences shouldn't be causing the problems I'm seeing. (If nothing else works, I'll put the stock piston back in. If it cures the problem, Wiseco's name will be mud...) Mikromo, I'm not sure I understand what you meant by saying the power valve spring was backwards. I did take the whole power valve assembly apart and replace the O-rings, so I could have messed something up. The only spring that I remember is on the right side, a torsion spring that wants to keep the valves in the closed or low-rpm position. The centrifugal actuator oversomes this spring to open the valves as the rpm increases. Is that the spring you're talking about? With the linkage disconnected, I can actuate the valves and the spring seems to be doing what it's supposed to. I took the pipe off and looked in the exhaust ports with a flashlight, and everything seems fine. Maybe the '99 design is different from the '96? Burt [/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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