If you have a too rich amount of Seafoam it may not run on that . I have seen it smoke like crazy for a few minutes.
Mine is very hard to start if below 45 F degrees. Needs a lot of choke and love to get it going with out flooding the plugs. Sometime a shot or two of starting fluid also.
At the bottom of the float bowls there is a screw that if you loosen it a few turns will drain the float bowl. You can see if about 2-3 ounces of fuel comes out and what it looks like. If it doesn't come out it may be dry and the pump not working well. If crusty and rusty, then there is a reason.
Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler