I bought an extended axle off of Yamaha28, installed it last week, and have been riding it since. I've noticed that when I get up around 4th gear and let off the gas the rear tires bounce around a little. It's pretty noticeable. It's only when I let off the gas, when I'm hitting the gas it runs normal. What could this be? I checked the hubs and carrier for play and there isn't any. I adjusted the chain tensioners because I thought I may have put them on a little bit off. I can't figure it out. Anybody have any ideas?