Hey guys!!! I am new to this forum and I am hoping you all can help me with my RZR. I have a 2008 RZR S and it will crank and idle good but it has no power when I give it the throttle. It is almost like something in the engine is dragging. I did notice that my exhaust pipe is sooted up with black soot. and my plugs are black. Could that mean I need a top end rebuild?? or should I check somewhere else first? PLEASE HELP!!