I bought this motor new and broke it in smoothly and the motor ran like a champ for maybe 3 tanks of gas. Then knowing i wouldn't be able to mess with it for a couple weeks i used at least a teaspoon of after run oil in the carb and the glow plug hole. When i went back to drive the car weeks later, the motor was very difficult to turn over with the pull starter. It's soo stiff every ten pulls instead of turning the motor it will actuall lift the car up in the air. I assumed the chamber was just flooded and cleared it out, but the problem still persists. I've unflooded the motor a dozen times and it still is a real bear to turn over, like the compression has been doubled! I'm completely lost. Thanks for your help.