I'm having problems breaking in my rtx27 from duratrax, i'm following the break in instructions but the motor keeps overheating (300+ degrees) and I have only ran 1 tank through it. I cut it off before it gets to hot let it cool and with in a few minutes its back at 300 again. The high speed needle is set at 4 1/2 turns out. Im using 20% odonnel fuel and a cold to medium plug. please help thanks