1, On the timming tag. It reads from left to right A-O-R with the marks. I would think they mean degrees. What does the A mean and R mean the O is TDC I belive. If you set your timming before TDC, is that on the R side? 2, Motor will stall after it has been warmed up. And then after a while it will run okay. I was wondering if it could have anything to do with the fuel pump. Also it has no choke hooked up. But will get engine petty wram before driving. What would you think about a manual choke? It has HEI. Could there be somthing worng there. Thanks, John.