ORIGINAL: 3d-aholic
Well I saw a DL50 running for the first time this weekend and it was impressive and it looks definetly to be pulling harder and sounded more uniform than a DA50. He was getting 6800 on a PT 22x8 at first gallon. And, he flew twice, no problem. However, on the 3rd time up, the motor was acting wierd on starting.....would run for about 2 seconds and stop. He fliped for about 15-20minutes and it never ran longer than 2-3 seconds.
With gas engines it is absolutely essential that your fuel is well filtered (during mixing) and that you use a *good* filter in the fuel line. If you don't the small sintered filter in the carby will soon clog and produce the symptoms you describe.
If the sintered filter bocks then it's pretty common for the engine to fire (maybe even run) while the choke is on but stop when the choke is turned off.
Another possibility is a weak ignition battery or a faulty ignition -- apart from that, gas engines aren't really any more complex than a glow motor.