hi tech inovations speed ring ( yamaha primary)

[ski-man]

Couple questions, is this clutch sheave still around? what's everyones take on it, is it or was it worth the money? Is thunder products marketing Duane Watts stuff? I have a 700sx that needs a primary sheave and was wondering.

 

[sideshowBob]

Lots of info on this topic....just search "over drive"

Here's one :

http://www.totallyamaha.net/forums/showthread.php?t=41308&highlight=overdrive