I just got my bike back from the shop and notice it wasn't running the way it was. I noticed it was making noise during shifting. So i put my bike on a bike dolly and spun the rear tire and noticed it had some slack. Something inside the middle of the wheel does not seem right. I can move the wheel back and front freely around 6-8 inches before it moves the chain with the wheel. Is this normal or do i have a bad bearing or rim?? Also have a bogging out issue at the high end of my gears. They told me it might be the CDI (rev box) and seeing that this part is $350.00 just want some advice about it before i buy it. This is a expensive guess.