In October, we took the whole family for an ATV weekend. I took all 5 of my machines. 600, 500, both Magnums and the Predator 90 that I got for the grandkids. Son in Law borrowed a 900 Razr.
Turns out the best tool I took with me was a tow rope. Both the 325 Magnums and the 90 ended up on a tow rope. The MOSE committed suicide I think. Blew the oil cooler line off and spit all the engine oil out onto the trail. The other Magnum just stopped running. Pull the rope, and couldn’t feel any compression. The 90 stopped running while I was using the winch on the wife’s machine to get her unstuck.
I figured out the 90 is an electrical issue. Problem is the previous owner took the key switch out and rewired it according to instructions he found on line. I can’t make heads or tails out of the mess, so I will start with a new harness and key switch later this winter.
Dove into the 325 first as that is what I have a plow for. It had broken the timing chain. Piston hit the valves and bent them both. Piston was scored, shattered the crankshaft gear. New piston, rings, valves, timing chain and gear….Gasket set and time. Finished that one yesterday. Back on it’s wheels ready to plow! In the upper right of the first photo, you can see that the chain failed at a link. Haven’t been able determine the exact chain of events, just the end result. Pretty sure the chain failed first.
Next one up the MOSE. Got the plastics off and the engine on the bench today. Tomorrow I will tear it down. Crankshaft is not stuck. Has plenty of compression. I think the loss of oil pressure caused the rod bearing to fail. I put the hose back on and fresh oil back in it after we got it back to the cabin. It would run, but loosing power. Shut it down and winched it on the trailer. I think the rod bearing has failed.
