Roger7 — Like Sooty, I've only had this "shudder" a couple of times in the eighteen months I've owned my TCH. I wonder whether it might have been caused by some water in the gasoline? Perhaps try changing your gasoline and see if this stops it, or add one can of gas-line antifreeze (ethanol) to the gas tank and see if this helps. Let us know! By the way, this has been discussed before in this forum, but I don't recall which thread.

Stan