Does this sound right for a 400EX??
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I read on the net (can't remember where) where some dude is claiming his all stock 400EX with a Big Gun exhaust, re-jet and K&N is making 39hp! I can't find anyone else that says they make this much hp with so few mods. Even these pipe companies that dyno these bikes don't claim that much hp. I found a web page that displays all sorts of dynographs for various bikes and they had a stroked 440EX with a Big Gun at 41 crank horsepower. This guy with 39 on a stock bike plus the above mentioned mods has got to be padding his numbers or making an uneducated guess.
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mrtidy
Polaris Ask an Expert! In fond memory of Old Polaris Tech.
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02-03-2016 05:00 PM
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