I recently bought a new OS 18TZ, but prior to putting it on the car, I took the carb off and ran it on a different motor. Unfortunately, I changed the factory settings to tune-in the motor I put the carb on. Now that I am trying to "run-in" the new motor with the carb it came with, it takes forever to start. I have to trim the throttle so that the carb is open quite a bit before it will start (after 3 minutes on the starter box!!!). Once it starts I trim the throttle back down and it idles fine and runs without stalling. I have set the carb back to factory settings but I have to go through the above process every time I try to start the damn thing. Can someone, anybody please help me with this!!???