Re: Missing 10 Horsepower on '08 U.S. Fireblade?
I thought this had been covered here, but perhaps it was on another forum. Honda took timing out of the 10K+ RPM range and the power curve dips from there on up. Supposedly that was because the EPA noise levels are measured at an RPM which is at half of the power peak. So on US bikes the power peak is at 10k. Thus, the noise regulations are met at 5K RPM. If you look at two dyno graphs, you can clearly see the power drop off at 10k on US bikes where it is still climbing hard on bikes produced for other markets.