RegC
TreeHouser
Both used but still have good compression. Spark screen removed on 200, 540 is ported. 16 in bars. Semi chisel chains. 56 DL on the 540, 55 on the 200T.... the Stihl bar and chain is noticeably thinner. You decide.
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Seriously you may have got steel fragments from the drilling drawn into the cylinder, not good as you may have scored the cylinder. The exhaust port in the cylinder not only expels it also makes a vacuum .
was planning on a replacement, but maybe not anymore.