Thoughts on 024 cylinder?

[stihl saws]

What could cause this shiny ring in the chamber, but no marks on the piston?

 

[Hedgerow]

It's the only area of the jug with a tight enough clearance to properly function as a squish band.

 

[jmssaws]

Also the exhaust side of the cylinder is hotter than the intake side so it will carbon more on the exhaust side.

 

[Chainsaw Jim]

That's where the fuel makes the most contact before combustion. It keeps it nice and clean.

 

[bigbadbob]

Your piston may be worn on the skirt allowing the it to flop a bit,,,had an 066 that you could have shaved with the thin skirt and it flopped and left a it clean like that.
But I could be wrong,,,
BBB

 

[stihl saws]

Your piston may be worn on the skirt allowing the it to flop a bit,,,had an 066 that you could have shaved with the thin skirt and it flopped and left a it clean like that.
But I could be wrong,,,
BBB

That was my first thought, but the piston shows no sign of contact. It was running a gasket and the bearings all seem tight.

 

[Chainsaw Jim]

That is some very excessive carbon build up. It's good you decided to clean it up before it could break loose and destroy the piston. Maybe consider changing brands of oil unless you bought it that way.

 

[stihl saws]

That is some very excessive carbon build up. It's good you decided to clean it up before it could break loose and destroy the piston. Maybe consider changing brands of oil unless you bought it that way.

 

[stihl saws]

That is some very excessive carbon build up. It's good you decided to clean it up before it could break loose and destroy the piston. Maybe consider changing brands of oil unless you bought it that way.

It does have the worst carbon I've seen. No idea what oil it was. It's just a parts saw I've had for years. Seems like a low hour saw though.

 

[Chainsaw Jim]

It does have the worst carbon I've seen. No idea what oil it was. It's just a parts saw I've had for years. Seems like a low hour saw though.

A stick of butter may burn cleaner as mix than what was used. Lol

 

[stihl saws]

A stick of butter may burn cleaner as mix than what was used. Lol

I agree. It was probably a homeowner saw . 16:1 with 30 HD. Lol. The bore looks great, a lot of carbon in the exhaust though.

 

[jake wells]

ultrasonic cleaner with a quart of la awesome from the dollar store will clean that gunk off.

 

[MustangMike]

Possibly they just let it idle way too much.

 

[Hedgerow]

If it was skirt wear, it would have had "the death rattle".
I've seen it on 2 026's.

 

[Al Smith]

 

[Al Smith]

I could not figure how to add text to the above . Never the less as I suspected the 024 has an offset chamber . Suppossedly the offset chambers using domed pistons lessened the effects of "short circuiting" the fuel charge out the exhaust port .Evidently it didn't prove to be a great idea because it was discontinued on later models .Namely the 038 AV to 038 mag and the 024 to 026 models .

Now as such would it not make sense the effects of compression and ignition would be greater on the side away from the exhaust and cause some rocking off the piston .

As to the carbon maybe oil ratio maybe just set extremely rich .Who really knows?

 

[bwalker]

That is some very excessive carbon build up. It's good you decided to clean it up before it could break loose and destroy the piston. Maybe consider changing brands of oil unless you bought it that way.

Looks lean to me as well.

 

[stihl_head1982]

ultrasonic cleaner with a quart of la awesome from the dollar store will clean that gunk off.

would it turn the cylinder black? Some cleaners do...

 

[jake wells]

would it turn the cylinder black? Some cleaners do...

no it doesn't turn the cylinder black

 

[stihl_head1982]

no it doesn't turn the cylinder black

Hopefully it would come out nice and shiney ?!