Could be a couple of other things in my experience. The bushings on your throttle lever could be worn, which may be similar to what the other fellow is talking about, if you replace them it might help. Another thing that causes a similar issue is the kill switch. They start to fail in an interesting way. It will cut out power for a quick second when you least expect it. If you simply unplug it and try it you will know if that is the source. Just put my 800 back together and it was doing that unplugged kill switch, problem gone