HORSEPOWER, 2001 f4i
 

I have not put my bike on a dyno my bike is primarily for show and fun not a race bike, but Iv seen the stock torque ratings and horsepower is that at the crank tho? The reason I ask is because I saw a Busa with a turbo and intercooler, valve and head work run 170 at the rear wheel in a contest and thought wow thats low. Now Its a dumb question the published rating, is that crank or wheel? I have a 2004 f4i motor and trans re geared and has major work and thats tucked into a 2004 Honda 400ex quad frame and im curious what that might do

RE: HORSEPOWER, 2001 f4i
 

The spec sheets list the indicated horsepower (at the crank).

RE: HORSEPOWER, 2001 f4i
 

Wow sounds like a crazy ride. A stock 600f4i probably puts down around 92-93 stock at the rear tire. It is impossible to know what your putting down (with major work) but a friend had his head ported and shave, cam work, full race exhaust, stacks and a k+n filter and he pulled down 109 at the rear wheel which is a 20 percent increase. He then had the computer custom programmed and switched to synthetic oil and layed down 113, which is huge...

RE: HORSEPOWER, 2001 f4i
 

My 04 F4i dyno'd at 94 max horse

Charts are here: http://www.biperformance.ca/dyno.htm