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Ok so progress has been made in the long saga of my poor chainsaw. I had recently replaced the spark plug so I hadn't really considered that as an issue but on a whim I bought a new on and sure enough it fired up. Sadly it just ran for a bit and died. It also wouldn't fully rev. Carb...

New flywheel. Still nothing. I did get it to hit a couple times but can't make it happen again. It's pulling fuel into the top end since the plug gets wet. I see what appears to be good spark. I don't get it. I'm about to give up. The time an money I've spent on this could have easily...

Ok I'm now on to something. In the process of this rebuild I had replaced the flywheel. The new flywheel came in a package that had the right part number on the outside but I failed to notice that it had the wrong part inside. The timing is a full 60 deg off when compared to the old...

Thank you. I was sure this was the case and it points to a different issue. I have measured the cylinder compression and it's fine. I put starter fluid into the spark plug hole and it still doesn't fire. I can see spark but it is apparently insufficient. I'll look into that side of it...

So if one or both crank seals is bad, would it not fire at all, even with some starter fluid? Seems like it should still fire with starter fluid put directly into the spark plug opening. Also, I thought the plastic cylinder inserts were identical but I just figured out they have different...

It's been a bit since I checked in here but thank you. Having done some research here and on other sites I had already about reached that conclusion. I'll tear it down again when I get time and see what I can find.

Ok ok in my irritation and haste I missed an important point. It's a Poulan Pro PP5020AV chainsaw. It has a new carb on it and I checked the flywheel key...a couple times. I have a new spark plug and the one I pulled out. Both produce good spark as far as I can tell and I've tried both...

I'm at my wit's end. You all led me in the right direction when we found a scored piston. I changed it and the cylinder. Sealed it back up with Loctite 515 and with a coat of oil on the cylinder wall. Compression checked at about 125-130psi. There's a good blue spark and the spark plug is...

I picked up a tester and verified that I have plenty of compression (around 135 psi). I'm running out of ideas here.

Yes I did. Loctite 515

OK. I took this thing apart and replaced the cylinder, piston & ring. I followed a VERY good tutorial on the subject here: >> tutorial video << So now I have replaced every fuel component but the tank, the plug, ignition coil, air filter, carb, cylinder, rings, piston. It still will not...

Yikes. I don't see any visible sign of overheating (other than the piston of course) and didn't smell anything out of the ordinary (I'm assuming you would smell a burned up clutch). Is it still likely that I have damage beyond what a cylinder and piston kit will fix? I would like to rebuild...

So I'm the only person who has used this saw, started it, tuned it, or put fuel or bar oil in it. Unfortunately I think I know who's responsible. :LOL: My goal now is just to decide whether I want to rebuild or replace it. And to learn enough to not do it again. I'll inspect it more...

I'm the only person who has ever put fuel in this saw and it has certainly always been mixed correctly. It may have been run lean, that I can't be so sure of. Would that cause the same damage? I'm not trying to debate your conclusion, just wanting to understand it. Also, pardon my ignorance...

Poulan saws are not bad saws when properly tuned. The problem IL is very few techs even know how to properly tune a two cycle engine. Many techs are simply too lazy to even learn how. Good info. This and everything else here in fact. Thank you all. I looked through the plug port and it...

Thank you. I'm ready to figure it out and fix it or throw the dang thing away. ? I appreciate anything I can look for at this point. Any idea what might have caused cylinder damage if that's the case? I've taken pretty good care of it and it doesn't have that many hours.

My saw hasn't run for a while. The issues started when I was cutting up a fairly large hickory tree that fell. The saw started getting dieing after it got hot. Later it wouldn't start at all. So here's what I've done and checked: Changed the plug, fuel filter, air filter, carburetor, and...