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Chainsaw carburetor adjustments

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Rich in NJ

09-30-2004 09:22:07




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After a battle usually reserved for my '41 9N, I got my 10 year old McCulloch chain saw up and running again. The problem turned out to be a failed coil. Now I'm having to adjust the carburetor and my owners manual simply states that "it's adjusted at the factory." This isn't helping me any. There are three raised letters on the side of the case (T, H and L) that correspond to three slotted adjusting screws. I'm guessing the T is for throttle (which is strange, since there is a throttle control in the handle), the L is for low speed and the H is for high speed. I can get it to run and cut, but I can't get the chain to stop turning even after taking my finger off of the throttle. Is anyone familiar with adjusting these things? Any help would be greatly appreciated!!

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Cap-N-ID

09-30-2004 13:55:53




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 Re: Chainsaw carburetor adjustments in reply to Rich in NJ, 09-30-2004 09:22:07  
Rich -- what the other guys said is correct for T throttle stop = idle RPM, L = low speed mixture, and H = high speed mixture. Most throttle stop screws screw in (clockwise) for faster idle. Most mixture screws screw in (clockwise)for leaner and out for richer but it doesn't matter, you'll figure out what works on your saw. With the mixture adjustments when you have the saw running back them out until the engine is rough and kinda stumbles, then screw in (lean) until the engine smooths out and picks up to max RPM. If you go too lean the engine will stop fairly cleanly, not just stumble along. This is particularly noticable when you are adjusting the high speed mixture at full throttle. Adjust your low speed mixture first to where it runs at IT's highest rpm with no throttle. Next adjust the high speed mixture for max RPM with the throttle held wide open (I sometimes do this while cutting through a large log to put some load on the engine). Then go back and set the engine idle speed with the throttle stop screw for where it will continue to idle without the chain moving. If your chain won't stop moving with the idle speed fairly slow then take the clutch off and see if it hasn't gotten sticky or rusty inside. The clutch will be a centrifical clutch and should slip below a fast idle. If you have a "kick-back" bar across the front of your saw which locks the chain you can sometimes clean up the clutch by locking the chain with that while the saw is running and giving it enough throttle to "slip the clutch" a bit. (this isn't as good as properly cleaning it. If you're starting off with a carb that is pretty far out of adjustment you may need to go through the adjustments a second time to fine tune. Properly adjusted and warm the engine should start easily, take full throttle immediately and cleanly from idle when the throttle is snapped open, and run and pull strongly and crisply at full throttle with no stumbling or "burbling". Be careful.
--Cap--

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Rich in NJ

10-01-2004 05:13:54




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 Re: Chainsaw carburetor adjustments in reply to Cap-N-ID, 09-30-2004 13:55:53  
Cap - Wow! Thank you very much for the info. This will help a lot. I had never even thought of the clutch and will check that out as well.



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GVS

09-30-2004 09:41:45




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 Re: Chainsaw carburetor adjustments in reply to Rich in NJ, 09-30-2004 09:22:07  
T will adjust idle speed. Turn counter clockwise to decrease idle speed.



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DanL-Colorado

09-30-2004 09:31:49




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 Re: Chainsaw carburetor adjustments in reply to Rich in NJ, 09-30-2004 09:22:07  
L and H would be the low and high speed mixture adjustments. T, I'm guessing, is the idle stop screw.



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Rich in NJ

09-30-2004 12:43:36




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 Re: Chainsaw carburetor adjustments in reply to DanL-Colorado, 09-30-2004 09:31:49  
Thanks guys! I had kinda figured that what you all had said was right, but I can't seem to get the engine to idle without the chain slowing to a stop. If I push the saw into a log and force the chain to stop turning, then the engine dies. The other problem is that if I tweak the L and H settings, I can get the engine to idle OK, but then it has no power when I squeeze the throttle. Is there anyone out there who knows the finer points of adjusting these things?

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Jack - Illinois

09-30-2004 16:04:49




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 Re: Chainsaw carburetor adjustments in reply to Rich in NJ, 09-30-2004 12:43:36  
Have you checked the clutch to see if it turns free when the engine is stopped?



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Tim ohio

09-30-2004 15:52:16




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 Re: Chainsaw carburetor adjustments in reply to Rich in NJ, 09-30-2004 12:43:36  
Bad gas nnd gumed up carb and reeds



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