O200 in J3cub today, nice and cold outside, mags off, prop rotated a couple of times, backwards. 4 full primes left mag on and handswing. Started first swing. Hop in and both mags on, apply a little throttle 600-700rpm. If it cuts out before I get in. Re-prime and go through same drill, slowly and carefully.
No mixture so always fixed.
Shut down: mags off, with throttle idle.
The only difference between my cold start and my winter start is that during summer I can get away with no primes and she starts after two blades.
Respect the prop.
Don't trust the mag switch, good to know it works on shut down,
If you shut down by closing fuel lever you will be surprised how long it continues to run for!