Answers to your questions,
1- I got my sprocket set from OFD racing at OFD.com (ask for Dean)
2- You will need a speedo healer Part# Speedo Healer Version 4 + SH-Y01
3- No
Hope this helps...
Isnt it great!!
I really havent noticed to much mpg drop off. I mean their is some, but not enough to where I would go back to stock.
You really fly thru the gears...
FYI:
When you put on the light bolts make sure you hold the bolt still with the allen key and tighten the nut. If you hold the nut still and tighten with the allen key you might undo the wires out of the bolt. The maker told me this when I was at the picture shoot.
I own one and i dont even use it. It only has one speaker and the mp3 player has to be bluetooth or you have to use the mp3 player in your phone.
Its a cool idea but the volume didnt turn up enough for me (to many rock concerts).
I now have a stereo speaker system in my helmet that plugs...