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  1. #1
    Silver Member NCMau's Avatar
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    Nov 2009
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    NC
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    MF 202/Ford 8N/JD425

    Default Blade always running

    My old Stihl mod 015 has been a great saw over the years. But since I replaced the clutch, the blade always runs at idle speed. I am assuming that the clutch is at fault because it is always engaged regardless of the low speed/idle adjustment. When I try to adjust the low speed to a minimum, the engine stops.
    The clutch I ordered is supposed to be the correct part and it is branded Stihl. Can the carburetor be at fault? Any suggestions?
    The Arc was built by a DIY team. The Titanic was built by professionals... you figure!

  2. #2
    Platinum Member
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    Jul 2016
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    Winchester, VA
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    Kubota BX25D

    Default Re: Blade always running

    Chainsaws don't have blades.

    Unless the clutch is defective, the reason for the chain moving at idle is simply that the idle is set too high.

  3. #3
    Silver Member
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    Nov 2016
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    204
    Location
    Santa Cruz Mountains, Ca
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    Branson 3725H

    Default Re: Blade always running

    If the clutch does not disengage even at low engine speeds it's a problem with the clutch.
    Sounds like there was a problem with the clutch installation or the wrong part was used. It's unlikely that a new part would be defective but it does happen. Does the clutch spin freely when the saw is off? Either way you should take it off and figure out what's wrong. A chain that doesn't stop is dangerous.

  4. #4
    Platinum Member
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    Oct 2013
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    JD 345/ Kubota Side by/ kubota ??

    Default Re: Blade always running

    I'm doubting its a problem with the new clutch...More than likely the old clutch did not engage well, so when tuned they increased idle speed for throttle response. Now that the new unworn clutch is in you can back the idle speed down until the chain doesn't move at idle anymore. Very simple to do especially on the older saws. You should see 3 holes, H, L, I. Start the saw let it get completely warmed up and then turn the I screw counter CW until the chain stops moving at idle. On your stihl, the H and L should be side by side and the I below them.

  5. #5
    Silver Member
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    Nov 2016
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    Santa Cruz Mountains, Ca
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    Branson 3725H

    Default Re: Blade always running

    The OP said that the clutch is still engaged even when he turns the idle down so far that the saw stalls. The low speed mixture could be so far off that the saw won't run anywhere close to idle but it'd have to be really far off to make the saw run so fast that a clutch in good shape stays engaged. And it would be obvious that the saw isnt' idling at that point. Also he said that the problem started when he replaced the clutch. When something doesn't work right after you make a change, the first place to look is the thing you changed.

    If you have messed with the mixture so much that you're lost, you can go back to the factory recommended starting point (often 1 turn out on Stihl) and go from there. On my Stihls the idle screw is marked 'LA'.

  6. #6
    Super Star Member Egon's Avatar
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    Default Re: Blade always running

    Does the "blade" stop when the saw is at idle and engaged with some wood or does the engine stall?
    Egon
    50 years behind the times
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  7. #7
    Super Member Coyote machine's Avatar
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    Southern VT
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    '10 Kioti DK 40se/hst KL-401 FEL, loaded tires, KB-2485 bhoe, Tuffline TB160 boxblade, Woods QA forks, MIE Hydraulic bhoe thumb & ripper tooth, Igland 4001 winch, & GR-20 Log Grapple. Woods BBX72" Mower. Diamondplate aluminum canopy.

    Default Re: Blade always running

    Its a chain that runs on a bar attached to the head of the saw. The chain should not move at correct idle, after warmed to operating temp and at proper mixture. You need to figure out where the saw is set at and set it up properly as to mixture and idle, as already mentioned by others.
    The bar needs to be straight with no burrs in the track where the chain rides, and not gummed up or pinched either.
    The clutch mechanism needs to be the correct one for your model saw, and the chain must match the bar and saw it's used on, as well as being properly tensioned, but not too tight, or loose. Too tight a chain will damage the engine bearing when the saw cools, and the chain should be loosened after being run to reduce this risk of damage. This is stated in one of the various Stihl manuals, I've owned over the years.
    So, after having made all the adjustments suggested so far, if you still have a running chain at idle, your carb's functional ability to reach correct idle may be compromised by any number of issues.
    Report back where you're after doing what's already been suggested, then let's see where you're at.
    2010 DK-40se/hst, KL-401 FEL, (reversible cutting edge), Titan Tree Shear. 72" Ratchet Rake. Fit Rite Top-N-Tilt hydraulics & diverter. HLA Series 2000 7' plow, Aquiline MPC rear chains. Samuri Sickle bar.

    2015 Husky AWD Rider 322T Combi 103 deck. Scag Wildcat: Kawasaki 26HP, bagger. Dr. brush mower, & 42" lawn deck, Dr. self propelled, 6.5HP Trimmer mower. Pro-Mow 3 gang, no HP.

    Bunch of STIHL chainsaws: 011x 2, MS192T, MS200T, MS180C, MS230, MS270 (Wood Boss), 038 Farmboss.

  8. #8
    Super Star Member Egon's Avatar
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    Default Re: Blade always running

    The cutting part of a chainsaw:

    A chain with extended upper links that culminate in teeth that are sharpend to form a blade that the chain pulls through wood. It is guided/supported by extended lower links that will fit in a slot of a guide.

    A Bar: dat's the place you visit after a day of guiding blades through wood and where pain reliever may be purchased.
    Egon
    50 years behind the times
    Livin in a
    Worn out skin bag filled with rattlin bones

  9. #9
    Platinum Member
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    Winchester, VA
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    Kubota BX25D

    Default Re: Blade always running

    Quote Originally Posted by Egon View Post
    The cutting part of a chainsaw:

    A chain with extended upper links that culminate in teeth that are sharpend to form a blade that the chain pulls through wood.

    No, it's sharpened to form a tooth.

    There is no "blade", and all the stubborn ignorance in the world won't make it a blade.

  10. #10
    Elite Member 4570Man's Avatar
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    Crossville, TN
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    Kubota L3240, Kubota B7100, Kubota F2560, John Deer, F525 Mule 600

    Default Re: Blade always running

    My 372XP pulls the chain pretty fasts once I first start it up. If I put the chain brake on you can hear it put the engine under load. After I've made a cut it'll idle without moving the chain. BTW, the correct terminology is a chain. I'm not sure why that matters anyway.

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