I must not have explained the air intake thing correctly cause my son in law and I were brainstorming yesterday and it is the choke mechanism. The bike starts with that air vent closed, then after it starts at idle when you open the throttle, it pour pure air into the engine to lean out the mixture of gas/air. It took us a while to figure it out but that's what it does. It just leans out the mixture like turning off the choke automatically. Actually it is the automatic choke mechanism. I have no idea what will happen when I put a load on it without the massive air intake being open. It might just be like running at 1/2 throttle.

I still need to devise some kind of very small air filter for the 'new' carb. I'm thinking bottle cap with a small amount of oil soaked cloth one layer. Lots of holes in the cap,

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