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Yamaha MX & Off-Road Dirt Bikes
How much HP can Yamaha's 426 produce
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[QUOTE="Dirk Diggler, post: 154554, member: 23939"] I dynoed my bike, stock standard. It is a 2002 KTM 520exc. Put out 47 RWHP. Changed the jetting, put a new end cap on the muffler and repacked it. Now puts out 54 RWHP. It was stated from one professional rider, can't remember who, that 55 RWHP is about optimol. Any more would be unusable. I would of been happy with 47 RWHP, but the way it made power was crap. Now the tourque curve is as flat as a 12yo;) [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
How much HP can Yamaha's 426 produce
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