Yeah you should do that, soak all the parts in white spirits and clean them with a tooth brush. try adding a drop of fuel into the fuel tap while holding the valve in by hand and see if any gets through.I cant seem to get my overflow to stop leaking i have tore the whole carb apart numerous times and cleaned it but it still leaks? do you guys have any input as to what it might be. if tried adjusting the float but ti still leaks. should i take the pin out of the float arm that regulates the gas and clean it out. i think it might be sticking a little.