I am going to have Jeff at advanced dist. build me a new dizzy. On his work sheet He asked for all the info on your engine. I know most of it in my head. But never did a compression check, Just did it this morning 190-190-193-190. I was surprised on the high numbers. On my TR 250 the reading are in the 145 range... The head must have been shaved a little more than stock. LOL.