I read throught the manual thoroughly and set the needle at the starting point. The manual didn't say a thing about the low speed setting. Maybe it is because this is an FXi motor and comes preset? Serching the web I found FX46 instructions that told how to initially set the low speed mixture. Needed about a half turn leaner on high speed to get to run continuously at WOT without battery. I don't ever recall a motor having such an issue with kepping the plug lit under rich conditions.

-thanks again