Clogged filter caused it to run LEAN
? That tells you all you need to know about this dealer.
A Stihl dealer that doesn't know the saw has an intellicarb is one to stay clear of.
View attachment 208240 View attachment 208241 View attachment 208242 Thread update. I took the cyl. off. The piston is scored & the top of it has gouges. The cyl. wall looks good, no gouges but there are gouges up in the spark plug chamber. The rings are not broken but are seized on one side. The connecting rod has a lot of play on the crank. I have never had one of these apart but the play seems excessive??????
Side to side play is normal for the connecting rod, up and down is not.
Million dollar question is what was the foreign object and more importantly where did it come from.
You might be looking at a full rebuild with new bearings and seals.
If there is no scoring in the cylinder wall plating that cylinder can be cleaned up fairly easily. Save that old piston it can be the tool to do the job. Clean the top of the piston with a wire wheel removing all the carbon and oil. File off the gouges in the skirts and flatten the top of the piston on a true flat surface on a piece of sandpaper. Now take a piece of self adhesive sandpaper and stick the piston to it and cut off the excess with a razor knife close to the piston so none extends past the outside. Find yourself an eye bolt that will fit in the piston pin that will be tall enough to attach a cordless drill and give it a spin on the squish band, it should not take much to take of the high spots.
If aluminum transfer is present this will also need to be cleaned off, there are vidja's around here on how to go about that.
Now you're down to just needing a piston and can use your reclaimed cylinder. A quality AM piston will be just fine here.
Making sure there is no other damage is important so as not to repeat. If even the littlest bit of doubt remains split the case and do a full rebuild.
If this is rebuilt now is the time to assess the rubber parts such as the intake boot, impulse and fuel lines, as well as the carburetor diaphragms for possible replacement and new fuel and air filters and a new spark plug.
Note: this saw can be successfully rebuilt without disconnecting the oil pump from its output line, just ease it out of the way, this way the "fun" job of replacing said line doesn't have to be done if not needed to begin with.