HI all, i am new to the hobby and i have a .61 ThunderTiger PRO engine, i've had a lot of issues with it. Initially broke in with fuel without nitro. After 10 flights it stabilized and i thought was broke in. I have now 5% nitro fuel. It is overheating, even when running rich as it pops a lot when i apply full throtle with a rich setting on the needle, is running on 11K rpms and a 11x7.5 prop which is the recommended one. Have an OS8 glow plug that glows fine when i check it out of the engine. The engine runs unstable in either lean or rich setting and then shuts off unexpectedly. Very overheated, i notice a strong vibration when running it over 8K RPMs, don't know what to do it seems is not the needle. Altitude in here is 7500ft, no fuel leaks on the system. Any clues to check ?, how do i know if that vibration is normal or causing the overheating ?, i can't even touch the muffler because temp. Not lean as a lot of smoke and unburnt fuel comes out of the muffler. It hesitates to pick speed when throtling fast, i do not know what to do, what should i try ?.

Thank you,
Felipe