This is a great build, I have a 79cc mounted the same as yours, and was wanting to know what performance improvements I may be able to get form a pump. I have a pump like you are using that I could mount on mine if it would make a difference.Picture of the day: made a bracket for the fuel pump, the pump is a must if you want good performance.
I see, It wouldn't do me any good either.The fuel pump is used when the carb is above the tank, with it installed you won't starve the carb.
After lowering the motor in the frame I realized the fuel pump is not needed on this bike, a couple hours of wasted time....making this setup...O-Well
I know you already know this, but you build beautiful things. So much custom work and so much thought/engineering. I admire your builds very much.
Gilbert