The bike we raced was pretty much out of the box new and it only had .2 hours on the engine timer before we started the race. None of us had ridden the bike before so we were not sure how it was set up. However, midway through the first lap, I already started to feel comfortable on the bike. It took 7 laps for the suspension to set in because at the beginning, the suspension was too stiff and the bike was no easy to control. When the suspension broke in, it worked a lot better and it was easier to maneuver the bike. The head shake was really bad at the beginning and towards the middle of the race it got a lot better to the point where it was almost gone. During the middle of the race, the rear shock got hot and the rebound loosened up to the point that it felt like the rear tire was flat. The sensation was so strong, that I slowed down and rode the bike cautiously, thinking that my rear tire might pop out of the rim because it was flat. When I got to the pits, we checked the tire and it was fine, so I looked like a fool because it turned out to be our slowest lap. Later the shock felt normal, but the rear wheel became unbalanced and in mid air I could feel its vibration.