Let me warn you, if that sprocket is all aluminum you will be changing it out in like 5k. Keep a close eye on the teeth they will sharpen to a point then break off if you let it go that far.I installed the 42t Renthal sprocket with the stock chain with no problems today.
I took the bike for a short ride and not able to do any real power wheelies easily but it surely has more low end than before. Rpm's are at 6k at 75mph in 6th gear.
I couldnt believe how much lighter it is than the stock sprocket. Probably shaved off 3 lbs.
Saturday night I'll see if my e.t.'s are any better at the track.
Nice look tho!