Does anyone know where I can find a parts diagram or breakdown for the Bendix Zenith Carb that are on the Wisconsin engines? The only ones I have found show how to adjust them, etc. but no parts breakdown. Main item I am after is the spring on the float. I have a 8.5 hp that has a spring on it and a 10 hp that does not. Is this spring necessary? Which way is the correct way to install it, pressure to help hold the float up or hold it down ? Thank much for your time and valued advice.