07 Phazer. I think 1 cylinder is gone

sled would not run good. wanted to die at idle, tried to get on it after a long warm up and it was missing on top end. pulled it up to the shop and it just stopped running. thought it was a fouled plug. no, the plug on the PTO side was kind of ruff and eat away. put hand over holes and mag side was blowing air around hand. put hand over PTO side and it was just giving a very light puff against my hand.
Do not have a compression gauge that fits those little plugs. I did shove one done with a rubber boot on it and it read like 70 on the mag and like 10 on the pto. again it was not the correct gauge to use but it should be close. put some old plugs in it and would start but did not want to run.

What does it take to re-doo one of these 4 strokes. I hope for the best, just a bad piston and rings, not the cylinder. sled has a turbo, never got to run it hard.

Any way to try to keep it short, I am new to the 4 strokers and would like to have some input.

Phazer

The Turbo kit is a boondocker. It also has the boondocker control box. The only thing I can hear about that thing is to get rid of it and run stock on the ignition. I want to put a boost gauge on the sled. You cant see what is going on because you cant see the boondocker control box when riding. Only running 13 lbs of boost with torco additive. The last time the motor was apart was when boondocker steel sleved the motor. motor was sent to boondocker. motor should be indistructable, Well Almost

De compression

How does the decompression work? one cylinder or both. if I have to redo the motor than I might as well do the update for the cold start, and part of that is the decompression spring I hear

fire

Will do the tear down on sat.

When the sled died I tried to start the sled. But it was on fire underneath and ever time I tried to start the sled the fire grew. then someone got my attention about it and I looked underneath and saw the glow. I shoved snow until it was out. I thought it was just the exaust burning the fuel in the pipe from the dead cylinder. But maybe it is a broken line or disconnected.

That does not explain the low compression. When I pulled the plugs the one in the bad cylinder was bone dry, pitted and eat away the tip and prongs.