From
http://www.svrider.com/forum/showthread.php?t=81464:
Quote:
Up thru 2005, all R-6 use the same throttle tube, part 5SL-26240-01-00. This one is 36.5mm.
From 2006 til now, they use that same part number for the "S" model, but all the other R-6 models use a different one, part 2CO-02640-00-00. This one is 40.5mm.
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Those numbers match up pretty well with
icbm's post.
Also keep in mind that the percentage of a turn will vary based on how far the cable has to be pulled to open the throttle all the way. Going to a bigger/smaller wheel on the throttle tube will always result in less/more throttle travel on the same bike (as the larger diameter means a longer circumference, meaning it's pulling the cable further). Depending on how the other end of the cable is setup though, different bikes could have different throws even with the same throttle tube. My '09 EX500 uses the same 46019-1077 throttle assembly as the '07 EX250, and it's 1/4 turn (90°) from fully closed to WOT, compared to the
180°+ described by Purspeed.
Based on the experiences posted here and the info at
http://www.gixxer.com/forums/showthread.php?t=213953, I'd guess (since I don't want to take mine apart) that the PreGen/500 throttle tube's wheel diameter is similar to the 33.5mm on the GSXR 600. The throw on my 500 seems just a bit too long - I feel like I have to bend my wrist a little further than I'd like to get that last bit of throttle (I can't imagine needing over half a turn). I may look into a NewGen throttle tube for a little extra cable pull.