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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="Matt90GT, post: 1366592, member: 30871"] 50 pilot, that sounds really rich. What is stock? The 450s use a 40-42 stock and most around here at sealevel run a 45 pilot since the stock is a tad lean. I would go back to stock on the pilot then adjust the fuel screw. If you still have problems, then adjust the needle clip position. YOu need to find what throttle opening you have the issue at, not the RPMs to narrow down what part of the carb you need to tune better. [/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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