Chainsaw Repair

WAG    Maybe some flashing left in the exhaust port. 

Does it have any air leak symptoms when rolled side to side and bar up and  down etc?

No it was running fine.

I did it too.  I added efco to his title.

Thanks will add brand from now on.
Non ethanol premium gas.  Looking @ the piston top there was one little ding looking spot in the carbon on the off side of the score.  Could have been piece of slag don't know.  Does Gilhardoni make Efco cylinders?  The 4-5 I've looked @ were very nice looked like some Gihl cyl's I've had.
My thought was running hot from being pig rich @ 11,200??  Kid that was running it was probably leaning on it hard.  I wasn't there so don't know just know the kid.
Shep