I just recently went +3 on the rear (43t) sprocket on my gen1 and LOVE the improved acceleration . I was also happy to find it didn't increase my hiway RPM enuf to be annoying . As a side note , down one in the front is about equal to up 2.4 in the rear , so very similar . My 'Busa will now roll-on wheelie with no clutching , throttle-chopping or jerking at any RPM over about 4,700 (in first anyway) just nail the throttle and it will rise , much more like a liter bike . On stock gearing I had to be above 5,500 and chop the throttle a bit to get the front wheel off the ground .