I bought the jato3.3 on 11/23/2012 , I followed the break in procedure to a T , I have not even got a gallon of gas through it and it imploded on the inside , I spoke with my local hobby store where I bought it and they gave me great tips on keeping the engine running slightly rich and to make sure not to run lean. Great smoke coming out of exhaust which they told me is a good indication that the engine was running slightly rich and that's where i needed to run it. I called Traxxas this morning and they told me to send it in and they would consider replacing my engine. Has anyone ran into any issues with these engines? Im kind of not happy at all with the quality of this product , maybe I just got a bad engine. Guess I will wait and see what traxxas says.