Husqvarna 550XPG cylinder scoring

[Joery]

Hello,

I like to start by saying I am new at repairing a chainsaw. I bought a Husqvarna 550XPG for cheap, because the seller could not get it started. Out of anger he broke the top cover.

When I got home it started after 4-5 pulls. It seems to run fine, I cut a few discs with it to try out and cut some old hardwood beams and planks I had laying around for about an hour. In that time it did not quit and idled fine, and started while being hot.

Before I started it at all I looked for scoring through the exhaust port, now after I have taken it apart it looks a lot worse than I initially thought. This is where my inexperience comes into play, what is too much scoring, since it appears to run fine?

I am able to buy a used OEM cylinder and piston, without scoring, for a decent price, therefore I am asking for an expert opinion on this.

I also noticed some gunk in the bottom of the crank case, which appears to come from the heating element of the carburetor, of which the rubber has disintegrated. Could this soft rubber have caused the scoring? I also wouldn't be surprised if the seller ran it with straight gas, since he also stripped a bunch of bolt heads and managed to split the spark plug sealing ring lol.

Again, I am a complete novice, I like to learn by trying, I need to get started somehow !

 

[Gord404]

cylinder looks behond cleanup repair- did you put new mix when you got it- I don't trust other peoples mix when I fix a saw

 

[huskihl]

Somebody straight gassed it. Looks like some pretty bad gouges above the intake. It may run for a while but the scoring is going to get worse

 

[JoeryD]

I thought so, I guess I'll get a different cylinder and piston. I cleaned the carburetor and put Husqvarna pre-mix in it, the gas that it came in smelled funky.

 

[huskydave]

cylinder looks behond cleanup repair- did you put new mix when you got it- I don't trust other peoples mix when I fix a saw

this, first thing I do is dump fuel from any piece of equipment I touch...

 

[Mad Professor]

Pictures on the internet?

I'd at least spend a few minutes to see for sure if those are gouges in the plating or transfer from the piston. I've seen some ugly ones clean up.

 

[Gord404]

this, first thing I do is dump fuel from any piece of equipment I touch...

ya got a 440 in the other day and thought the guy knew what he was doing- used the wrong can of gas - no mix

 

[Joery]

Pictures on the internet?

I'd at least spend a few minutes to see for sure if those are gouges in the plating or transfer from the piston. I've seen some ugly ones clean up.

Unfortunately they are pretty deep gouges, I am assuming the straight gas due to it basically looking like its new. It still had the TrioBrake on it when I got it, no sane person can work with that for longer than a few minutes lol.

The scratches are mostly from me working on it.

 

[Joery]

Installed a used OEM cylinder and new OEM piston, and it appears to have good compression again, and runs good !