Still trying to get this new engine running right. First season, wont idle cold, changed auto bi-starter, ok for a short while. Second season, out twice and now will not throttle up but will start and idle. I have rulled out the strainer in the fuel tank, as it acts the same connected or not. The fuel filter looks fine. Not sure about the fuel pump or carb. All linkage works fine. I ordered another bi-starter to try. If that fails, what next ?? Fuel filter ? Fuel Pump ? Pull the carb ? Could it be the control unit ? At witts end.....suggestions anyone ?