Caterpillar low cost solution
I was thinking of getting a Kaoko Throttle lock for my 800GS, but I really couldn't come to terms with the price ... $155AUS for something which is pretty simple.
I found a few threads where people had used specific caterpillar O rings as throttle locks, and thought for $4AUS why not. The part number that seems to fit my 800 with Barkbusters is 8M5266, there is another size at 8M4991. They are made of silicon and won't be affected by the weather much.
Installation takes about one minute ... remove end of throttle side barkbuster, slide on O Ring and reinstall barkbuster bolt.
I have just tried it, and am surprised to find that it works very well. You just slide the O ring onto the throttle grip in one movement and it is locked, but you can still easily adjust the throttle opening or close it. To disengage, just slip the O ring back onto the end weight. Happens in one easy movement. It is nice to be able to take your hand off the bars, but you wouldn't be able to use it in situations like traffic. Would be wonderful on the infamous Hay plain in Australia
So ... very cheap and simple, it works, is very easy to install, very light weight and ... its yellow and matches my bike!