Chainsaw Repair

And so it begins.
I was given an MS360 Pro. It seemed to run OK initially but has become impossible to start. It ran fine yesterday morning for a short time, say 30min. It was hard to start after a short break but I finally got it going. After another short break it would not start at all and that is where I am now.

I have run thru the normal troubleshooting steps:
•   Fuel (recently replaced fuel tube and filter)
•   Carburetor
•   Spark Arrestor
•   Plug

I even checked the mag to be sure it was clean and I set clearance at .002, which is where it was when I disassembled. I am getting spark, but it doesn’t seem to be very strong. When trying to start it doesn't sound like it is getting fire, but it is difficult to otell for sure. I tried to get a compression reading but I’m not 100% confident in my reading, 55-65 psi. No idea what the compression is supposed to be. And lastly, when I had the cover off the muffler to check the arrestor screen I could see vertical striations on the piston .

I am thinking of replacing the coil assembly, but the marks on the piston have me a bit worried, even though when the saw did run it seemed to run fairly strong.

I am looking for any suggestions or recommendations.

Thanks

Pull the muffler off and visually inspect the piston/cylinder

You guys are just full of good news. 

Nothing I wasn't really expecting, though. Just had to put it out there. You know, hope beyond hope.

So its a minimum top end rebuild. Any particular cylinder/piston brand I should stay away from? Any parts shop you would recommend for good service and reasonable pricing?

Thanks to all for your feedback. And have a great day!

Here is one I took in trade and redid top etc. http://chainsawrepair.createaforum.com/stihl/stihl-036-pro-trade-in/

I have a some clean used oem 036 pistons and cylinder if you want to go that route.