The Revolver Throttle Kit...
The Revolver Throttle Kit took some modifying in order to fit the Hayabusa since it was designed for a GSX-R600/750/1000, but simple hand tools provided an easy fix. Now the throttle throw is totally tunable.
Out of all the conceivable mods for a streetbike, the throttle is quite possibly the most ignored. No matter if a bike is semi-stock or built to the hilt, chances are good it has the stock throttle assembly.
The twist grip is easily overlooked when considering modifications, but ask anyone who’s upgraded to an aftermarket throttle assembly and most will mention it’s a worthwhile addition.
So it only made sense that when the SSB turbo Hayabusa was in need of a new throttle, we turned to a trick trigger from Motion Pro—the Revolver Throttle Kit to be exact.
The kit comes with everything needed to get twisting, and it installed in roughly an hour. In addition to an easy install and quality construction, the Motion Pro throttle features a removable setscrew so a swap to aftermarket clip-ons doesn’t necessitate drilling holes and dealing with the stock housing’s fragile plastic pins. But quite possibly its strongest attribute is the unit’s adjustability.
[1] The stock throttle assembly...
[1] The stock throttle assembly was sufficient for the street, but its long twist rate didn’t allow for WOT without a re-grip. This costs precious time at the drag strip.
[2] Start the removal process...
[2] Start the removal process by sliding the OEM throttle assembly off the clip-on. Then follow the cables down to the throttle bodies and unhook them. The stock Hayabusa unit incorporates the starter/hazard-light/killswitch housing. Fear not, Motion Pro has that covered.
[3] A replacement starter/killswitch...
[3] A replacement starter/killswitch that’s a direct fit for the GSX-R units comes with the kit. Unfortunately it was too wide for our ’Busa since our tether killswitch occupied precious clip-on real estate. We plan on relocating the tether so the Motion Pro unit will then fit. If not for the tether it would have been a simple remove and replace.
[4] Don’t forget to move the...
[4] Don’t forget to move the wiring from the stock switch to the Motion Pro unit. It’s simple; just remember what color went where. We only took this picture so you’d think we are electrical geniuses (that’s hardly the case).
[5] Next up is the new throttle...
[5] Next up is the new throttle tube, the cam of your choice and the cables. Loosely mount everything on the clip-on and feed the cables to the throttle bodies via the same path the stock ones were routed.
[6] Route the Motion Pro cables...
[6] Route the Motion Pro cables to the throttle bodies and tighten up any excess slack. Be sure not to connect them backwards.
It’s a tunable throttle. Unlike the stock throttle assembly, the Motion Pro can be tuned for a longer or shorter twist. This means that a racer might want a quarter-turn or less since reaching WOT often requires a cumbersome re-grip, while a stunter might want a longer throw to better control smaller throttle inputs.
[7] Mount the cable housing...
[7] Mount the cable housing over the throttle cam and adjust the throttle for the desired amount of free play. Simply add the grip and away you go. Note that while our tether killswitch didn’t leave enough space to mount the Motion Pro housing, on a stock bike it would be an easy replacement. This wasn’t a problem on our end because we’re in the process of making a custom push-button ignition for the ’Busa (more on that mod soon).
Unlike the adjustable throttle kits of old, the Motion Pro allows for easy swaps between the throttle cams without having to readjust the cables. For those unaware of the troublesome adjustable units from yesteryear, consider this a blessing.
What does this mean for the turbo ‘Busa? It allowed for a short-turn orientation at the track where traction was good and WOT was easily achieved with a quarter turn. But on the street a quick switch to a longer throw (smaller throttle cam) allowed for better throttle modulation where traction is anything but consistent on a 400 HP bike.
The ability to instantly transform throttle travel might sound like a novelty, but it’s quite beneficial. The throttle is a crucial part of the motorcycling equation and one that’s used every rolling moment. So doesn’t it make sense that a better twist grip would lead to a better bike? We think so.
BUYER'S BOX
MOTION PRO
Revolver Throttle Kit
$154.99
motionpro.com
*60 MINUTES TO INSTALL
NEXT MONTH: A CBR600RR gets a rear-end revamp.