I have tried leing in it out and riching alot back and forth I guess I didn't really riching it alot because I was watching smoke and plenty way to much smoke was coming out or so I thought. I also could smell the nitro alot more so thought it was rich. But I didn't change glow plug since it broke in if it did maybe I will try that. I also will try factory settings maybe. I am using the stock muffler that came with the hawk pro black one.