From this TriumphRat.net reference thread andrewt
showed that it is possible to swap the Triumph throttle grip with a Yamaha R1 grip.
However from the same thread, Martin_R
made this important observation:
Originally Posted by Martin_R
The caveat is that the actual throttle grip cam on 1050 is 36.5mm and on the R1 grip it is 37mm. So translated to actual throttle degrees the change is only a few degrees. Not worth the trouble, if it is a quick action throttle one is after.
But then I found the following thread on a Gixxer forum that shows the differences of several throttle grips, knowing that the R6 Grip is a VERY popular swap over many different marques:
(please note that you will be unable to see the images unless you are registered member, however all the text is visible without registering)
So the next logical extension for the Triumph is to fit the R6 throttle grip, which has a larger cam (40.5mm) and that will decrease the rotation proportionately.
From that thread and andrewt's I have amalgamated the pictures to show the differences:
Since the R1 and Triumph grips are readily interchangeable per andrewt nad the R1/R6 grips themselves are interchangeable with each other, reasonable to assume the R6 will interchange with the Triumph (caveat - I have not validated this empirically!)
An R6 throttle grip part number 2C0-26240-00-00 from somewhere like http://www.mrcycles.com
is $18.58. (list price $25)