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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
400sx top end increase
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[QUOTE="Bigbird, post: 609142, member: 19669"] I have a 2002 400SX that I have bumped to 450 via a Thumper Racing kit. (Short stroke, bigger piston). I love the motor with the changes, but am looking for a little more top end. I have a stock exhaust system with an FMF Q SA. I am wondering if the power bomb headers increase the top end, the bottom or both, and to what extent. I have also been told that a 520 cam adds top end. Does anyone have any experience with these modifications? [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
400sx top end increase
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