Yes it's fuel
here

 

with the bottle the carb leaks through the overflow

 

spark video
https://www.transfernow.net/dl/spark

 

Need to rework carb needle, seat and float. Also why you want to keep vacuum petcock. But of course in a working order.

Get you a hand held vacuum pump. You need it for old stuff and bleeding brakes.

 

I will remove the vacuum petcock

 

the routing hoses is good like that?



My bike

Without vacuum petcock

 

I'd think very seriously about trashing the hypercharger, those things are notorious for trouble with vacuum leaks. It would explain a lot of the issues you are having.

 

Hello
I bought rebuild kit and petcock
I’ll let you know if it works

 

Hi
I changed the seals but there are still 5 left in the kit.

 

The kits come with extra gaskets/o-rings for different series of the CV plus a few I've never figured out

Photo# 3 - take that o-ring off. The mixture screw should have a small spring next to the threads, small flat washer and smaller o-ring, in that order. The tiny o-ring usually stays stuck up in the carb body. Those 3 parts do not come in any kit that I know of and have to be purchased separately. Don't worry about them so long as they are all in correct order when assembled.

Shake the bowl. You should hear a distinct rattle. If not, more cleaning is required...