I notice you have an '07 Tomos Streetmate, and an '07 Tomos LX. The best thing you can do for yourself and your mopeds is to get rid of the oil injection systems, and the sooner the better. On peds that new, I wouldn't worry about turning the petcock off if you ride them a lot, and as for starting, whatever works best. Depends on temperature, humidity, altitude, and a few other things. I put my choke on, and with the moped on the stand, kickstart it with the throttle closed, as soon as it fires, I open the throttle all the way real quick to release the choke, then release the throttle, and it idles fine. Let it warm up for a couple of minutes unless you just rode it. But seriously, get rid of those oil injectors. They will fail, and seriously damage your engine, and maybe even cause a crash when your engine locks up due to a lack of oil. Peace. Jerry.