You lubed the cylinder with 10w30? No. Use 2 stroke oil.
Are you tuning the carburetor for this setup?
You're probably running lean/totally untuned and possibly have air leaks as well.
The only time i've seen a moped "dieseling" is when my stupid crank case drain bolt rattled out of my e50 during a long rally ride causing a crazy lean condition on a hot cylinder. Could not shut that fucker off, revving to the moon on the centerstand with no throttle input. had to pull the spark plug boot.