I raced mine and never hankered after a shorter action. As Monkey says, the NSR throttle is acommon mod to the 4 strokes, as it is shorter than the standard.

I like the extra control the NSR has over a shorter throttle - it's not safe to have an on/off switch on a two stroke!
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
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GTS1000 oddball