11,000 sounds a bit low, I would look for around 12,000 if you are running a MAS 11-6 prop. To be sure you would have to supply prop info such as 2 or 3 blade, size and pitch such as 11-5 and also the brand such as APC or Master Airscrew. For info, you will never see high rpms like 16,000 unless you are using a prop that is too small to be practical for most airplanes. For OS 46 FX series engines I conistantly read 14,200 for reliable running. Other engines such as the Thunder Tiger 42 turn an MAS 10-6 prop around 12000 rpm. Hope this helps.