I i have a second TH.75 that  I installed a new Piston and sleeve. I can not get that engine to run. I am 4 turns out on the low end needle and 2 turns out on the High speed needle. It is super tight and I have tried the heat gun to the head of the engine and still very hard to turn. Once I got it to run for like 3 second and it turned off. I haven't been able to get to run again. I checked the plug and it is getting heat. Help!!!! I have a P51 waiting for this engine!

Thanks in advanced