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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="jb_dallas, post: 1366793, member: 103004"] I started the bike up last night and specifically listened to the engine and watched the tach. The bike really doesnt idle smoothly or hold any specific rpm at any specific throttle opening, it jumps around a bit...as much as 200 rpm. I had always thought that the idle was somewhat rough because it is a racing motor, as this is my first MX 4 stroke. Is this common in early generation...or all...MX 4 strokes? [/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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