Ok, so i did the '04 R1 mod over the weekend, p/n 4YR-26240-02-00. Since i had aftermarket grips on i bought the matching left side R1 grip which fit great! So the entire install took less than 20 mins. For the money with was a great mod, and when not in gear it seemed to rev quicker. On the street i didnt notice much of a difference until i wacked the throttle to wide open, and def. noticed i didnt have to twist as far! So for that reason alone it is great!
I didnt find any difficulty riding like a normally do, no throttle ocntrol issues. I did notice the slight increase in gap between the end of the grip and the bar end, but only maybe an 1/8" not a big deal at all. I am curious to see what difference if any to my 60' times at the track which i only get to a few times a year, for i am mainly a street rider.
what i ordered from Ron Ayers:
4YR-26240-02-00 GRIP ASSY $9.16
4YR-26241-02-00 GRIP $3.74
thanks for everyones input on this mod.