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Dirt Bike Brands - Other
deceleration knock with 2 strokes
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[QUOTE="dirt bike dave, post: 1232574, member: 18302"] That is probably your powervalve just starting to open. When you don't give it more throttle, the bike slows down again. If you hold the throttle steady, the bike just surges back and forth. This is most noticeable when trying to cruise with steady throttle on a road. I've had several dual sported two strokes that did that, most noticeably a KDX 250 (at about 1/4 throttle). You never notice it in the dirt, as you are never cruising at a sustained low throttle opening. As to the knocking you originally posted, my guess it is small amounts of unburned fuel igniting in the pipe (probably close to the cylinder). Many bikes do this on decel. But as Rich noted, without hearing it there is no way for us to be certain. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
deceleration knock with 2 strokes
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