With the fuel line disconnected from the carb, there should be a good flow (not gushing) when the valve is open. It doesn’t take a lot of fuel to run these little motors. With the carb empty, if you blow in the fuel intake, air should pass through. If not, there is a blockage or float is stuck closing the valve. I usually test before re-installing. Right side up, air should pass. Upside down, no air should pass.
The front-most coil feeds the top cylinder.
