DItto on Connery and Snowball the needle too rich.... if it get's to start and then dies as you advance the throttle close the valve 1 or 2 clicks and re-start littel by little you'll be able to keep it running better as you advance the throttle u pt o ufll speed and then SLOWLY keep closing the valve until the engine drops rpms then back up (richen) as sonwball said.
I like my OS40's nice enignbe can keep up with toil and abuse (my two kids and me learned to fly on those ) ) the trick is to not lean them too much and then enjoy the ride