Well the 6-8inches of slush and at least a foot of powder on Lake Joe were too much for my sled yesterday. Was almost back to the truck when I felt the sled lose power.. I had my dad on the back + our Clam Nanook so there was no way I was going to stop.. Ran it on 1cyl for about 100 meters or so and once we got back to the truck.. Wouldn't restart (although it tried) so I knew I had a dead cyl.
Got it home and pulled the head + cyl and yup, cylinder closet to the exhaust was completely destroyed.. Blew one half off the piston skirt (I've never seen that before).. Other cylinder looks fine. No metal or anything in the crankcase.. Other then ordering a new piston/gasket kit is there anything else I should be looking at? I know the 03-06 550 fan cooled engines had major problems, but I can't find anything on my '01.. I've tried to search for additional cooling mods I can make to the sled in order for it to run cooler but haven't had much luck. What about header wrap for the exhaust? Perhaps some ducting from the front to cool the engine down a bit more? I've heard about the 550 running lean in the mid range which leads to the engine popping, but again I can't find anything specific to my year, just the 03-06 engines.. Should I maybe run the tank at 100:1 instead of straight gas in order to get around this issue? Again, just looking for some advice, thanks boys!
I had to keep the poor thing pinned to stay up on top of the slush, with all that extra weight it just couldn't take it.. I'm just glad it didn't happen out in the middle of the lake, we would have been in really bad shape if we had to walk back the 4+kms to the truck in those conditions.