McCulloch Pro Mac 850 or Pro Mac 800

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Now I need tuning advice I have to tune with a tach because I am almost completely deaf. I can't wear my hearing aids while running a saw so it makes tuning very difficult.
 
The kill switch is not working on this Pro Mac 850 but I'm noticing there's not a good ground from the tank to the block should there be?
 
The earlier SP models had a spring around the boot connecting the air box to the cylinder to provide the ground. Later PM models had a wire secured under the front snubber that attaches to the tank with the 1/4-20 screw that connects the anti-vibe mount to the fuel tank.

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The "5 sided" muffler is correct for the PM850, I expect you can find the parts for it with a bit of searching. I have run most of the 82cc McCulloch saws side by side and the PM850 with the reed muffler is among the best.

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Mark
 

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