So, have gotten 14 tanks through my trx 3.3 without any problems. I think that's all she wants to take through. 14 tanks is amazing, even with a cracked piston head and broken skirt. I think i now need to but new sleeve and skirt. She is fine through first gear, but when she switches to second she has little power. It might have to do with the fuel filter that's i added to it once I got the truck and put new fuel lines on it but I doubt it. This engine is strong, I'm not sure previous owner broke it in properly but it works fantastic now. Love the trx engine traxxas!