Join Date: Mar 2002
Location: California Central Coast
I checked out road tests of the two bikes in four different magazines, and you're right--there's not a lot of difference. Sport Rider reports a big improvement in horsepower for the i, but only slightly better quarter-mile ET and unchanged top speed. Cycle World found power unchanged and < .1sec better ET. Motorcyclist's dyno shows a drop in power (ET's aren't comparable because their regular rider didn't test the F4). Motorcycle Consumer News measured 2.5 more horsepower for the i but a whopping .6sec better ET and 1mph lower top speed.
Moral: Individual motorcycle differences and day-to-day test condition variations overshadow improved engine performance in the F4i.