I took my atv into shop due to what I described as it was running like it had a carburetor with the choke on. It has been super solid with 580 miles. They ran it down the road with no issue at all. Super quite and fast. I was dumbfounded. I asked if they could just check it in and look it over before my hunt in 1 week. He started it and this horrible noise came from engine. Now what..
BEARINGS everywhere from CAMSHAFT. I'm so upset that my atv will be in the shop while my hunt is on. Plus they can't find the 15 bearings. Only 3 so far. Let's see what extended warranty is gonna cover.
Now to the point.

Should I sell It?

I'm sure this has happened to someone else. I'm so scared to be out hunting with my daughter in the middle of nowhere and this failing again. I take very great care of it. No need to beat it up. It crawls everywhere like a beast.  Cforce 500 HO EPS 2 seater

You are the first to my knowledge to have this issue. They will have to account for every bit of loose steel in that engine. I would give them a chance to make it right. Bringing an unproven, even brand new, atv way out there would make me nervous though.

[2015 Z Force 800 53/Trail EPS]

I'm still pondering cam bearings..what bearings?

I can't be certain but looks like it's a radial bearing on the sprocket side and a plain bore or needle cup for the end. I don't see cam caps and rockers are in the main head and not in the cover like Yamaha.