McCulloch Pro Mac 610 Chainsaw, checking the Piston and the exhaust.
Chainsaw preventive maintenance. Checking the piston on the chainsaw for scoring and checking the screen on the muffler for carbon buildup.
Here's the parts manual and diagram for the McCulloch Mac 610 & 650
http://s30387.gridserver.com/partsDiagrams/McCulloch%20Pro%20Mac%20610%20and%20650.pdf
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