I'm having trouble with the break in procedure for the motor. Every time I start it up it lasts about 12 seconds and then it shuts down. If I give it gas it shuts down. I have tried adjusting the high speed needle, but it doesnt help. Any other ideas? I'm new to nitro and dont like messing with the engines much and dont want to try adjusting without knowing what I am doing. Any help would be appreciated. thanks.