We followed the instructions exactly by the book, after a couple heats it start clicking. We pulled it off the track and found motor came loose. We reset the motor and everything is now fine. Take your time building, this isn't as simple as a b4. If you rush the building, it'll cause things to come apart. This car is super tough even after the hardest landing and crashes after rolling over when hitting a rut on the track. That crash caused the motor to move. Now it's time to practice for the classic. AE doesn't sell junk, now if only they get more parts out to hobby shops, I'll be happy.