[rtx042]

I had the back end of the sled raised up to replace the sliders. Dropped the sled off of the chain hoist and pulled it outside to start.
The first pull on the recoil felt seemed like there was a higher resistance then normal and it didnt start up. Second pull started the sled but was only running on 2 cylinders. Noticed coolant from the exhaust and shut the engine off.
Pics show the damage to the mag side head.
I'm wondering if some fuel got past the needle when the back end of the sled was elevated and into the mag side. When the other 2 cylinders fired it might used a hydraulic effect to crack the head?
That's my best guess .........any other suggestions has to how this might have happened?
I got a used head from Bent Toys in North Bay delivered by Purolator today...total cost $135. New from Polaris...$298

 

[bigwedgies]

that possibilty is as good as any, i had the same exact thing happen to my ultra way back, basically same engine as yours. happened twice then the crank went out. my thought was the waterpump went bad allowing collant to leak into that cylinder. strangely enough mine was mag cylinder as well. ended up losing that rod a few weeks later, assuming i didnt clean it up well enough??? i replaced the whole motor and never really investigated.

 

[rtx042]

Got the pictures to load to the members area so I guess if you click on my ID you will be able to see them.

 

[Polaris_Parts_MN]

It's good practice to turn the fuel valve off during transportation or any time the sled is on its side or the rear end is lifted.

 

[vogey]

I shut my fuel off everytime i shut my sled off, have ever since the fist time i had to drain the case and try to get that last little 10mm bolt on the mag piston behind the water pump. what PIA!!!

 

[mattsdad]

samething happened to my 600 , mag side also, ended up twisting the crank 2, really sucked