My 50ng is tempermental....first, I must have a very good charge on my 4cell 1600 nicad.
Second, I turn plane on..ignition off, throttle wide open, crank by hand 15 to 20 times, throttle back to a couple clicks up, hand on choke switch on radio, ignition on...flip 5 to 8 times..and when it fires..throw choke off.and let her warm up.. call it strange but this is the only way I can get to start. If I miss that 1st fire
and try again..it won't work..and just floods the engine..I have done this the same way for over a year now....BUT...once it fires..it runs great
and have never EVER quit on me in the air.

My 3w and DA's start so much easier..but then again my DA in 2 years has quit on me in air 2 times and crashed thousands of $$$ worth of planes.

just my nickel worth...
Bobzilla