carb help

Hi, I have a mikuni 22 that I'm having some problems with. When I try to feed it fuel, fuel doesn't even go down the line into the carb. But the weird thing is, that when the carb is attached to the manifold it does this, but when it's off, it flows perfectly fine. I tried cleaning it twice...

Hello my neighbor asked me if I could take a look at their sons go kart. It ended up having a Briggs 5hp flathead on it. I've never messed with one before but told them I would since it sounded like the Carb just needed to be clean. Before I messed with it it crank on choke and run for 10...