I have a couple of those pipes. Might be a plan. The one SX needs a bearing, and the top of the cylinder has a 1/16th" plating flake on it. Kind of afraid to splurge on the bearings. I think there is another one around as well as an earlier ringed one. I remember a guy in the old club had a .40 4 stroke in a Wonder. Didn't sound fast, but sure went by quick.