is this how you score a piston?

[LHJim]

I have read numerous times folks mentioning that you score a piston by having a bad mixure of oil/gas. Is this the way you score a pistion? Are there other ways to score a piston besides having improper mixture? Just wondering...and I have never seen a scored pistion...

 

[Simonizer]

I have read numerous times folks mentioning that you score a piston by having a bad mixure of oil/gas. Is this the way you score a pistion? Are there other ways to score a piston besides having improper mixture? Just wondering...and I have never seen a scored pistion...

Insufficient or poor quality two-cycle mix. An air leak, seal,(bearing in the case of the 385/390), cylinder gasket. Water or debris ingestion due to a poor filtration system or damaged air filter, (damage will be on the intake side of the piston skirt). There are many ways to damage a piston and cylinder.

 

[EtzCutter]

Improper installation or movement of snap rings can wreak havoc inside the cylinder.

 

[mountainlake]

I think the NO 1 and 2 things are a dirty carb after sitting a while and just being set to lean. Steve

 

[pioneerguy600]

More pistons scored from using straight, unmixed gasoline than most all other mishaps when all types of users are considered. My experience anyway.
Pioneerguy600

 

[EtzCutter]

Loaning a saw out isn't good for the piston and cylinder.

Here's a thread, including pictures, of a scored piston and cylinder. The pictures are from a Stihl 290 that came to me damaged.

http://www.arboristsite.com/showthread.php?t=115052

 

[RVALUE]

I scored a muffler from Baileys at the last GTG.

 

[dancan]

I scored a muffler from Baileys at the last GTG.

LOL

 

[ouachita]

I saw a guy rock his chai badly and just keep cutting through a 20ish" piece of oak. it quit cutting but he just kept pushing harder. the almost new 350 never got through that cut it finally seized up. I have two of his saws virtually identicall problem. both basically trash.

 

[Mad Professor]

If you want to do slowly and painfully just run it without the air filter

 

[pioneerguy600]

I saw a guy rock his chai badly and just keep cutting through a 20ish" piece of oak. it quit cutting but he just kept pushing harder. the almost new 350 never got through that cut it finally seized up. I have two of his saws virtually identicall problem. both basically trash.

Over heating is certainaly a killer of two strokes.
pioneerguy600

 

[RVALUE]

I saw a guy rock his chai badly and just keep cutting through a 20ish" piece of oak. it quit cutting but he just kept pushing harder. the almost new 350 never got through that cut it finally seized up. I have two of his saws virtually identicall problem. both basically trash.

I lost my 372 when some kids were cutting a tree at 30 feet. I thought it was bad gas, but it could have been dull too. It seized. I couldn't tell what was going on from the ground. They didn't know.

Reckon what happened?

 

[mowoodchopper]

You can take the cyl off and use a sharp knife also!