Schwinn M Searcher w/ SBP Shifter Kit....NEED HELP TURNING ON

OK, so i finally finished installing the shift kit and 66cc grubee on my searcher. First of all, i have a question.

1. on the carb that came with the kit there is a lever for the gas, and then there is a lever on the end of the gas tank. I know where the "on" and "off" or on the tank lever, but i am not sure about the lever on the carb...please help.

Anyways, after i finished the build, i added gas mixture to the tank and choked it and everything you need to do before you attempt starting a motor. I get a little speed and start the engine. As soon as the engine starts, in revs real high and it does not idle. When i stop, the engine dies. If i try to rev with the throttle, nothing happens, but if i give it all it has for a couple of seconds, it starts to rev.
I tryed messing with the idle screw but it does not help....

Thanks for your help,

Roel

Thank you all for your help...i was able to find out that the problem was a leak where the carb mounts just like bikeguy joe stated. once again thank you all for your help.