New engine, a lot of bugs

[Guest]

The carbs are gravity fed (no kidding?) and the engine will provide ZERO vac in the tank. (you are correct there) Also the stock caps will never seal well enough to cause a flow problem ..... I have a special carb that pressurizes the tank and these bings aint it.

Bull, my cap sealed too tight and didn't vent....a quick drilling with the cordless took care of that.

What "bings"? These carbs on the China happytime engine are not Bings or anything remotely close to a Bing, Mikuni, or anything else.

What pressure carb are you running, a Walbro? How's that working for you?

Model/size/ect?