Warm it up more.
Mine runs poorly for 45 - 60 secs before it settles down to a grumpy idle for another minute or two. They're cantankerous little engines - just like a lawn mower!
PLUS, you've been messing with the spark advance and have not yet set the timing at 30º at 3000 rpm so your idle may be off until you get the ignition dialed in properly. If it's dying at idle after a few seconds it may mean that your not advanced enough yet.
Most of us never static time the spark advance unless you just want to get it running enough to then really set the timing at 30º maximum advance at 3000 engine rpm on a centrifugal advance disti. Once you've set it for 3000 rpm the idle advance will be what it will be - Whatever it is, just re-set your idle speed to 800-ish rpm.
Or call Anthony and have him walk you through it.