Mystery of the failed re-starts

Hey all. I tried doing some searching, but couldnt find anyone who has had this problem.

My '80cc' BoyGoFast motor has been displaying a very annoying tendency lately. Ill start it initially without issue and Ill ride it at least long enough for the motor to get hot. If I stop and shut the motor down for longer than a moment, it absolutely will not restart when Im ready to ride again. The stops are usually quick (between 5 and 15 minutes), and I find that giving it some time to sit after the failed starting attempts helps.

Ill wait and try and start and eventually get sputters, then wait and try and start and get more promising pops, then wait and finally it will start reluctantly.

This makes me think flooding, but I havent pulled the plug after one of these issues yet. Also, I cant figure why it would flood... weak spark? But why does it start without trouble initially...?

Anyone experience this or have an ideas cause I am flabbergasted.

I know theres no leaks on the intake side of things... Ive very carefully buttoned all that up. Ill check out around the head and plug tho next time i run it. I can run a compression test too to check the piston rings, but whats good pressure? 120 psi?

Also, the popping I mentioned is the motor firing, but not continuously. Just an succssful combustion here and there.

I had planned on upgrading the spark wire and cleaning the plug before the next time I ride already. While Im at it Ill give the rest of the electrical system a once over as well, and report back.

Jim, Ive got a shift kit, so I cant pop the clutch under way. Ive got to rely on my pedaling skills to turn the motor over. Is there something I can do to improve the the effects of the magnetic field? Move the coil closer to the flywheel? Close the spark plug gap?