I've got a ST-3000, on a Robin Hood 99 - and it's flamed out on me mid-flight several times.
I don't know the history of this engine, but I suspect it may have just a few flights "total" on it.
I think I was using 10% nitro fuel, and an OS #8 plug. Sounded great on the ground at idle, and full power.
Any ideas based upon your experience with this monster?
Thanks.