Been searching for quite a while for a Rhino. Found an 04 660. $4250 sounds like a good deal. No digital dash. Have not physically looked at it yet but plan to and need some pointers. The only thing I know thats wrong with it is the guy changed the oil and now it smokes "some" when you accelerate. He doesnt know why just doesnt want to fix it. Fuel/cdi/exhaust is stock. Tires and wheels after market. Looks clean from little I can see. What should I look for? Please help.