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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZ400F stumble at 5K RPM
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[QUOTE="_JOE_, post: 1366696, member: 77507"] The packing allows a smooth path for exhaust to get out. It should be wrapped tightly to the core to keep the flow going through the core. If the packing is blown out the flow gets impeded by turbulance in the can which can cause some performance issues. Your pilot seems good, not that it would affect the midrange much anyway. As long as you don't have any mechanical issues I would try moving the needle clip. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZ400F stumble at 5K RPM
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