I have an almost new US-41 installed "Inverted" (spark plug down) on a 1/4 Decathlon. The problem is that since the engine needs some fuel priming on the carb before it can get started, the spark plug gets wet with fuel and a spark is not generated, therefore the engine does not start. I always have to remove the spark plug to dry it and after that, the engine starts more easily.

My questions are:

1)- Could this problem be caused by improper spark plug gap or improper magneto gap? if so, what should be the correct gap spacing for each?
2)- Is there an easy way to add a prime bulb or choke instead of having to add fuel to the air intake? (on another plane, I had no starting problems using a Zenoah 38 with a choke)
3)- Should a Sullivan Dynatron Super Starter (Torque= 340 @12V) be able to turn the prop or should I used a belt driven starter? I tried this starter but it didn't turn the prop, maybe because of the battery or because I have no spinner installed? any suggestions?

Thanks.