I first learned of the "O-Ring" throttle control method from a discussion forum website so the idea is neither original nor mine. The "discoverer" of this method, and/or the particularly good qualities of the Caterpillar (Cat) O-Ring is likely lost to time.
The idea of the O-Ring cruise control is to roll the ring into the space between the throttle grip and the bar end weight. The qualities of the Cat O-Ring part number 8M4991 make it ideal as it has a certain "stickiness" that will grip both the throttle and the bar end weight. Someone else could probably tell you the materials that make the Caterpillar part different, I cannot.
Description:
The bar ends on my 2006 Triumph Sprint ST conveniently have a groove that seems custom made for parking an O-Ring of this size when not in use and keeps it from rolling off of the end of the weight. Not sure about other bikes but it will work without the groove; just figure out a different place to roll the ring when not in use.
Here is the Caterpillar O-Ring in it's "resting" place in the groove:
Here is the trick to getting the O-Ring to hold the throttle well. Notice that in the left picture, there is little space between the throttle grip and the bar end. This is the normal position of the throttle grip. In the picture on the right, I have pulled the grip inward to create a gap between it and the bar end, a perfect size for the O-Ring to settle into:
Below is the O-Ring in place between the grip and the bar end:
I wouldn't say that it works as a perfect throttle lock since normal vibration eventually loosens the hold of the O-Ring, but when taking long rides not having to physically hold the throttle open all the time certainly can take the strain off of your right hand.
You can find the o-rings at your local Caterpillar dealer. It is a cheap, inexpensive way to have cruise control on your bike.
Jeff Stevenson
jxs2151
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