Want to Sell Stihl 036 PRO with 20" bar now FUBARed NEED ADVICE

[old-cat]

Hold the cylinder upright as it sits on the saw, squirt kerosene or gas etc. into the upper transfer ports and watch for debris coming down. If there's none it's clean.
That debris will cause the scratches in a heartbeat.

 

[Oldsawnut]

Hold the cylinder upright as it sits on the saw, squirt kerosene or gas etc. into the upper transfer ports and watch for debris coming down. If there's none it's clean.
That debris will cause the scratches in a heartbeat.

+1 Its debris in the cylinder... Lightly scored all the way around the piston. If I hone now I generally get a clean rag and a big bottle of carb cleaner and liberally clean the heck out of everything especially blast out the ports. Even if I run it through a parts washer I still make sure and blast it with carb cleaner afterwards.. After I do that I blow it out then take a dab of 2 stroke oil and lightly coat the cylinder with a clean finger... Use as little oil as possible and make sure its 2 stroke. I suppose you could use a lightly oiled rag but I never liked the idea of particles from the rag possible coming off in the cylinder. The ports and the cylinder dome are hard to get the grit out of if they aren't done right.

 

[DSS]

See if it has the shielded crank bearings.been there and going through it now with a very low hour non pro 036.the shielded bearings cause build up in the seals.from what ive seen its an instantaneous melt down just about.

I've never seen this. Can you explain what builds up and what it causes? Why shielded bearings?

 

[jughead500]

Ok stihl used sheilded bearings for a short amount of time.the shields are inside of the crankcase both pointing towards the crankshaft.they keep fresh mix from washing contaminants out of the bearings.in this case it was a very low hour saw.the mix that got past the shield dried or gummed up repeatedly in the inside of the seal causing an air leak.the leak showed up like a sore thumb on the exhaust face of the piston to the pto side upon initial tear down.as soon as I seperated the cases I saw that the pto side throw on the crank was "dry".when I removed the pto side seal I wiped out a whole lot of caked in blackish dried grease type stuff.
I bought the saw off of nmurph back a few months ago for a friend of mine.the saw was in immaculate shape for a saw of its age.I inspected everything and everything checked iut just like murph said.I tuned ti our altitude and sent my buddy home with it to cut wood with his son.within 1/2 tank they texted me and said that it had locked up.murph has been a great dude to deal with on the saw.its in no way his fault or my buddys.it was just one of those things that happens due to a design flaw.may not have happened to another one ever again but im sure this isnt the first time I has.