RE: Ys 160 Dz first start in the morning
I never prime the DZ in fear of flooding the engine, I just let the engine spin and it will eventually start.
My biggest problem is the backfiring during start up after the first flight, I actually broke a cam gear once.
Since then, I have installed a Heliproz fuel shut off clip on the fuse's exposed fuel line. I usually start the engine with the kill switch on, and the clip clamped shut. As soon as the engine started, I release the kill switch and the fuel clip. I am getting a time delay glow driver from Japan, that should solve the problem.