I recently bought a Rhino. It’s my first side by side. It was cheap so jumped on it. However, the oil was low and black. And once I did an oil change it began smoking pretty dang bad so...I’m thinking of a top end rebuild. It will only be used to put put so no big deal but, I can’t find any good how to for the 450. Only 660. Also, any suggestions if I should have head serviced?