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Tool Talk Discussion Forum

Chainsaw tuning

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LM

12-04-2006 08:18:22




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Can anyone tell me the correct way to tune a chainsaw, the saw is a dolmar 112 Thanks




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Jim K

12-05-2006 16:00:28




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 Re: Chainsaw tuning in reply to LM, 12-04-2006 08:18:22  
I think what LM means is how do you adjust the carb. This is how I do it. There should be two screws, one marked withn an "L" the other with an "H" the "L" is your low speed mixture screw, turn this one till it will idle at a decent speed, usually fast enough to stay running but not fast enough to turn the chain on the bar. The screw marked "H" I adjust with the saw running at wide open throttle turn this screw till the saw is screeming then turn the screw back 1/4-1/2 turn.
It'll run a little slower which is a rich condition this is good. (lubrication in the crank case). when adjusting don't run saw for more than a few seconds at a time. or you'll sieze it.

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Butch(OH)

12-04-2006 14:38:04




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 Re: Chainsaw tuning in reply to LM, 12-04-2006 08:18:22  
Just happen to own a 112 and there is little need to remove the fly wheel unless you plan to invest in some special tools to set the points as the point cam is made in the flywheel. I hope that engineer got a fat bonus, LOL. Saws of that vintage will be having fuel line and carburetor diaphrams deteriation problems that will cause lean outs and lean means burned up pistons and cylinders. Setting the carb is of utmost importance for power and life of the motor. If you have no ear for setting one it is best left to somebody who does or someone with a tach.

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jeffcat

12-05-2006 00:16:40




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 Re: Chainsaw tuning in reply to Butch(OH), 12-04-2006 14:38:04  
Hey Butch,
Yea that is why I put what saws I work on. The new stuff is getting crazy from what I have heard. Have you seen one of these plastic carbs yet?!! What a hoot! You said about the carb rubber going and I tell people to watch out for too much corn juice in their gas. Zama carbs really hate it. If you want to see a real mechanical set up check out my Disston KB7-A saw. It has a full size Fairbanks mag on it! That is 1948 vintage hardware. It is always fun looking at this site. Jeffcat

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jeffcat

12-04-2006 09:20:16




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 Re: Chainsaw tuning in reply to LM, 12-04-2006 08:18:22  
Most all of the saws I have worked on,they are very much like lawn mowers. First off; why do you think it is out of time? With a lawn mover you need to hit a tree stump or some thing to break the key. With a chain saw it is very hard to do. McCulloch ,Partner, Mall,and Clinton saws are done this way. Remove the side cover to get at the flywheel. Take a REAL good look at the threads to see which way to remove the nut. If the flywheel is on the left side of the saw it should be a normal nut. The clutch side will be lefthand. Give the nut a gentle bump with your air wrench to losen the nut.
Take a look at the inside of the flywheel to see if anything got broken. If you have a key in the flywheel it must be perfect without any deformation. Same goes for a key that goes in the crankshaft. Put the flywheel back on and tighten the nut with a socket wrench and hold it with your hand. As it is most saws only need a few foot inches to tighten them. There are other things that will keep a saw from running but you need to give us more information. Jeffcat

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