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Husqvarna 240S carb diaphragm puzzle

Discussion in 'Chainsaw' started by Goofaroo, Mar 12, 2019.

  1. Goofaroo

    Goofaroo ArboristSite Lurker

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    C6729144-B227-4A2D-A096-247710030F5A.jpeg 8E94F1A4-0292-45E0-980D-9E63F2A2CA69.jpeg I bought a pile of saws a while back and have been bringing them back to life. My current project is a Husky 240S. It has a Walbro HDC carb on it and I ordered a kit to rebuild it. The “nub” on the diaphragm that activates the lever that opens the needle is longer than the one that I removed. Given the age of the saw and the tool marks on the carb I’m not confident that the one that was in it was correct. I have set the lever to the correct height for an HDC according to my Walbro gauge. Before I machine the “nub” down to match the one that I removed does anyone happen to know which would be correct for a 240S? I’m guessing I will need to shave the new one down to match the old one but if anyone knows I’d like to hear from you. The one on the left is the new one.
     
  2. hotshot

    hotshot ArboristSite Operative

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    The Walbro carb number is stamped on the side of the carb, what is it? HDC-32A?

    The diaphragm on the left looks like a Chinee “Ho Lee Cao” diaphragm.

    The one on that the right is correct, & came from a Walbro kit.

    That metering lever in the second pic is messed up too. I can post a picture of one properly adjusted, if you need it.
     
  3. Goofaroo

    Goofaroo ArboristSite Lurker

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    I’ll look tomorrow and get the numbers on the carb. I would appreciate a pic of how the lever is supposed to look. The kit didn’t come with a new lever or pin.
     
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  4. hotshot

    hotshot ArboristSite Operative

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    The forked connection at the metering needle should about be level.

    Your carb kinda looks like someone stacked two gaskets under the circuit plate. Maybe it’s just the camera angle that makes it look odd.

    Those levers are “permanently” attached to the circuit plate, so you’re correct about not being included in the K10-HDC kits.

    C9DA68CD-417C-40B8-A50E-D3975BC039F4.jpeg
     
  5. Goofaroo

    Goofaroo ArboristSite Lurker

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    There’s only one gasket under the circuit plate. I’ll pull it back off and bend the lever into a better angle. I may also have a similar carb in my hoard that I could rob some parts from.
    I appreciate your input. I’ve worked on quite a few Huskies but they’ve all been fairly new. This old 240S is the first one I’ve ever owned and it seems to be pretty well built so I’m curious to get it going and try it out.

    I buy saws just to give me some puzzles to work on.
     
  6. Goofaroo

    Goofaroo ArboristSite Lurker

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    67B5A9FC-7D91-45AC-8B5A-216E7969BAD6.jpeg 563F8660-31CC-48EB-AC35-3D5AB6EFEDB1.jpeg I bent both ends of the lever and it is opening and closing the valve as it should. I didn’t have another diaphragm so I ground down the nub on the new one to the height of the old one. I may end up having to adjust it when I get it running but it is easily accessible with the carb installed. I have plenty of work to do on the rest of the saw so for now I’m going to bag up the carb and set it aside. Thanks for all your help.

    In other news I finished up another project this morning. It’s a 1985 Sachs Dolmar 110 that I found in my saw pile. I also found a 1987 115 model. It will go under the knife when I finish the Husky.

    The 110 fires up and runs like a new saw. I haven’t cut with it yet but I have a feeling I will really like it.
     
  7. Goofaroo

    Goofaroo ArboristSite Lurker

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    6867D921-2189-48D4-A05C-FFD6E53C065C.jpeg I’ll be damned. I pulled the flywheel and coil and noticed what looked like a points cover. Took it off and sure enough this saw has points. I would have guessed it was a bit more modern than that. I decoded the serial number and discovered that it is a 1971 model. The points are in great shape so they’ll just get a good cleaning and go back in. Before I started working on this saw I put a little fuel in the cylinder and it busted right off and sounded great. The cylinder and piston look great and it has solid compression. So far I’m impressed with Husky’s build quality back then. This little saw might turn out to be a good workhorse.
     
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  8. hotshot

    hotshot ArboristSite Operative

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    What was the Walbro HDC-XX carb number stamped on the side?
     
  9. Goofaroo

    Goofaroo ArboristSite Lurker

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    32 A
     

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