so i got a late 70's (??????) briggs with a minibike frame. so i decided to put it on my DB30 frame just for something to do, and what i found is that you have to run it with the pull choke thinger out almost all the way. with the choke in, it will idle, but die out when i throttle it up. ive heard about this before and im proly gonna get some shit about 'search it' but i thought id try. so an explanation of whats going on would be appreciated.