I haven't seen or heard it yet but a couple days ago man said his four wheeler started smoking a little.

He changed the oil in it again yesterday and called me this morning and said it is knocking and smoking.

I don't know much about motors but it sounds like maybe a broken ring?
Maybe the knocking is the broken piece of ring on the piston?

Freaking sucks.
We have never had good luck buying used so I decided to not worry about it and buy a brand new 2013 Honda Rancher for him.

That worked good.

Guess we will find out today how good the warrenty is on them from Abernathy's.

Better be a non issue.

Reminds me of hee haw.... if it twernt for bad luck....
Youth is wasted on the young.