I have been reading online that a cheap alternative to high dollar kits is to replace your throttle tube with one from an R1 or an R6. Tried both as outlined in numerous discussions all over the interwebz, only to be disappointed. My 848EVO throttle tube has less rotation (by about 3 mm) to wfo that either of the two I tried, so myth busted.
On another note, I have a throttle tube for an R1 and an R6 up for grabs. I know it's not the For Sale board, but I'll put them there, don't worry.