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How bad was the cylinder scored? Just a scratch here and there, or is the piston skirt welded to the cylinder wall? Is the aluminum piston discolored, like a brown cast and are the rings free or carboned and/or welded to the piston?
If the skirt is wasted, chances are it ran lean on oil. Since a two stroke oils through the crankcase then into the cylinder, if there was no oil in the gas, the crank, main and rod bearings got a taste of running with no oil as well. If the crank and rod bearings look and feel ok, I would hone out the cylinder and oversize a piston.
If Stihl does not make oversized pistons, you can probably get one from Weisco or another piston manufacturer. Should not cost over $80.00. What will need be doen first is clean the cylinder up and mike it to see if it can be bored. Most steel inserted walls are sweat fit, and you cannot safely take more than .125 off the walls.
Machine work, gaskets and piston/rings should not go over $250.00. Our engine builder charges $60.00 per hole, and $75.00 for a blind cylinder (one that the head is molded to the top)
It will make you a good back up saw.
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Bill Schwab
In the year 1491, if the Naturescape Landscape Company did the site work in Pisa, Italy, they would not be calling it the "leaning" tower.
Encinitas, Ca. 92024
www.naturescapelandscape.com
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