Author Topic: Old mercury saw  (Read 128 times)

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Offline Ducksnuff870

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Old mercury saw
« on: July 29, 2016, 09:23:21 am »



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Offline Eccentric

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Re: Old mercury saw
« Reply #1 on: July 29, 2016, 01:54:19 pm »
That's a Mercury/Disston KB7-AY.  245cc/15ci twin cylinder gear drive running 3/4" pitch chain.
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.

Offline Ducksnuff870

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Re: Old mercury saw
« Reply #2 on: July 30, 2016, 06:20:12 pm »
Looks like it doesn't weigh much.


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Offline Eccentric

  • Moderator
  • Nitro Hotsaw
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  • Magnesium and Iron.
  • Location: Northern California.
Re: Old mercury saw
« Reply #3 on: August 02, 2016, 03:01:03 am »
LOL.  Yeah it's heavy.  I have one.  Powerhead weights at least 75 pounds.  A 6' bar with the oiler equipped helper handle is a good 20-30 pounds.  Then there is the loop of 3/4" chain.....
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.