r6 tube is a quick turn when installed on a GSXR, but I am not sure it is a quick turn on ALL bikes. It has to do with the ratio of the throttle tubes cam, to the throttle bodies cam. I had the R6 on the GSXR for a bunch of years. Just this year I went to the Motion pro (needed Cables, and the tube was cracked, seemed a good upgrade to both at the time). I ahve yet to really use it as intended, where you changed cams track to track, but it is a pretty nice kit. you do have to have some mechanical/electrical know how if your bikes throttle housing and kill switch are integrated though, to be able to wire up the aux kill switch.
I agree with Joe - the R6 tube (and R1 tube) I have in my garage is the same size as the OE Kawi tubes for my (since sold) 636 and (also gone) 10R. I haven't compared it to the 1K7's yet - but I have no problem opening the 1k7's throttle fully - it's just that I seem to do that about a split second later than anyone else...
