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Old 07-23-2017, 03:56 PM
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jrf
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Mounting the engine sideways (90 degrees from straight up) is a very good idea. It minimizes the oil on the airframe, it puts the carb at the centerline of the tank, which is where it will run most consistently, AND any excess prime will run out of the carb instead of into the crankcase. You will need to re-tune it though. It will be a little richer on both needles.

Sorry if this is a repeat, but if you are filling the tank through a T fitting in the tank-to-carb line without closing the needle valve or pinching off the line, that will flood the engine and cause the problems you have experienced.

Another thing that will cause an engine to start backwards is to flip it too slowly, or to have the prop set in the wrong part of the piston travel. The prop should be installed on the engine so that the piston just starts to come against compression when the prop is at 45 degrees. Starting the flip there means that you will reach the highest flip speed as the engine reaches top dead center.