Andrew
Yamaha does things a little different from the other bike builders.. They only use 1 throttle plate, that is a good thing, however it lowers restrictions in the intake track. Like I said they still have to make these things a little IDIOT proof to protect the rider. This is done with the computer controlling the throttle or "fly by wire" with computer commands. If you smash the throttle wide open the computer looks at what else the engine is doing and says "This guy is nuts, no way am I going to move that fast, he is getting ready to throw himself on his "ARSE", so using the good judgment programed at time of setting up the bike it does not open that fast and everything is just fine. Now a little better rider can open the throttle a little faster than a novice, and if he wishes to race and win he goes out and buys a $10,000.00 YEC Racing kit for his bike.
Like I said they do away with fly by wire all together and go back to the antique cable system. Now all that is left for you to do is figure out how to remove that stepper motor located on your throttle shaft and attach a bell-crank system in it's place. I would almost bet that an earlier throttle body will fit in the place of the new one. You might also have to replace the rubber boots on the head to get them to line up properly.
We race at a pretty constant rpm. The movable ram tubes were designed to help bike that had to operate smoothly from 1200 rpm's to 13000 rpm's and the length change helps out there. You probably operate from around 7000 rpm's to 13000 rpm's and the movement won't help much.
Remember short tracks with tight turns make the tubes long, long tracks with foot on the floor all the time short stacks.
Remember if you go to cables you are going to be way lean at low rpm's that is when the Dyno Man earns his keep.
Now get out there and do some searching, report back on what you find!!!
Honest Dad himself
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