Celebrated one year ownership by pushing scooter to warm garage for 24h for melt. Now fired it up after 17 days standing between -7 and -20 c, and after six short period starts few minutes, got sucked enough gas to carburetor to run as usual. Full tank small engine gas makes the difference. Ran half an hour still 2000-5000 rpm to load the battery full, I guess its enough. 30 cm snow and -13c stopped driving around the corner before it started.
Next start after two weeks max.