MOtor has 250 hrs on it. I recently replaced everything from the gas in the tank to rebuiolding the carb with a new gasket set. The motor will start whin I squirt gas down the carb throat and hold the throttle open manually. It will run at a high idle until it starves itself out of fuel. I am convinced that the carb cannot be the issue. A compression check weas fine. WHat other isues can there be?