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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
run bike without powervalve?
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[QUOTE="spanky250, post: 155209, member: 20897"] [b]Re: p valve[/b] The powervalve does not restrict the exhaust. It changes the exhaust port timing. When the valve is in the closed position, it lowers the top of the exhaust port, making the port open later in the stroke. This effectively moves the torque peak down in the rev range. When the valve is open, it raises the top of the exhaust port, allowing it to open sooner in the stroke, moving the torque peak higher in the rev range. Some engines do have small sub-exhaust-ports that the valve assembly uncovers when open to allow more flow at high rpms. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
run bike without powervalve?
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