There has been some issues with the bearing. I sent mine in and they took care of me. The only thing is if you want it back fast you will have to pay for overnight shipping. You will also have to run another 7 tanks through it. I made sure that I called in and filled out the repair form it is on their website www.cenracing.com I got the new engine in and it seems to run great. Cen has stood behind their product with me. But I make sure that I document everthing as well as give them the heads up that I am sending it in. I think Cen did not know the sucess they were going to have with that truck and got overwhelmed. As much as people want to flame that truck I like it so far. I have had a few problems but have gotten them resolved.