I have a new RCEXL twin cylinder ignition system that acts really weird. You do the normal start procedure; choke and flip till it runs and stops, then choke off and flip until it starts. But then the engine will only run for 2 to 5 seconds and quit as suddenly as if you turned the switch off. You can immediately flip the prop, and it will do the same thing; run for 2 to 5 seconds and stop. After doing this for anywhere from 6 to 12 times, it usually will finally take off and keep running. Once it has run for a bit, subsequent hot starts are one flip and away it goes. Sometimes the engine acts a little "baulky" during running, but mostly it runs ok after you finally get it going. It is as if the ignition unit has to "warm up" to work properly.

I put another RCEXL ignition box on the engine with no other changes. Same sensor, wiring, battery, carb settings, etc. With this other ignition box, the engine runs perfectly. Cold starts are normal and it keeps running. The engine in general seems to run slightly better with the alternate ignition box.

Please guys, I know the first paragraph could be construed as to indicate a lean low end, but that's not it. When it is doing it's start/stop routine, if you choke it the engine floods. (even with half choke) Richening the low end of the carb does not help either; it still just starts, runs a few seconds, and stops. Besides, it doesn't do this at all with the alternate ignition box, it runs perfectly. It is indeed a fault in the first ignition box.

Anyone run into this before??

Thanks,
AV8TOR