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Walbro WT card rebuild question

Discussion in 'Chainsaw' started by cjcocn, Mar 9, 2009.

  1. cjcocn

    cjcocn Tree Freak

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    Hello all

    I am rebuilding an older Husqvarna 51 for my wife as she wants to start using a chainsaw.

    The saw is about ready to run, with all new gaskets, new seals, new ring, etc. I put a carb kit in (full kit - including welch plug), but do not have the Walbro metering lever gauge to set the metering lever height.

    Can anyone give me a measurement on how far into the carb body the metering lever should be?

    As an alternative, can I just use the old metering lever and assume that it is set to the correct height?

    Also, when I stripped this carb it only had a metering diaphragm and no corresponding gasket. Did some of these WT carbs run that way? The saw was seized up when I got it, and I am not sure if someone messed with the carb and left out the gasket when re-assembling it. I do not want to put one in there "just because" or it will really be out of whack.

    The only way I could get the saw to run yesterday was by holding the throttle in the WOT position. Without touching the throttle, the saw was flooding.

    - the H, L, and T are all set to basic setting.

    - new plug, new fuel filter, air filter clean

    - ignition gapped to 0.012"

    Thanks

    :cheers:
     
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  2. Brian S

    Brian S AboristSite Guru

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    I just rebuilt a WT-391 and it DID have a gasket under the diaphram. I think the metering level is supposed to be level with the carb body on a Walbro, someone will be by to say for sure on that hopefully. I always reuse the metering lever if possible, haven't run into any problems that way yet.
     
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  3. blsnelling

    blsnelling Site Sponsor

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    The gasket missing will cause it to flood. It goes between the body and the diaphragm. The metering level should be level and parallel with the carb body.
     
  4. litefoot

    litefoot Addicted to ArboristSite

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    Chris,
    Go -->HERE<--. It should help. Sometimes, the gasket is stuck to the diaphragm and they come out as, what appears to be, one piece. Good luck, my friend.
     
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  5. cjcocn

    cjcocn Tree Freak

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    Guys

    Thanks for the info!

    Brian S ... thanks. I will put the old metering lever in and see how it turns out.

    blsnelling ... I can see how that would happen since the metering pin would be too close to the metering lever and open it at the wrong time and also open it too much. I bought the major repair kit so I will install the missing gasket this evening and give it another go.

    lifefoot ... thanks for that link! I have that file downloaded and printed out so I can refer to it for this and other rebuilds.

    :cheers:
     
  6. cjcocn

    cjcocn Tree Freak

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    BINGO!

    LOL ... I remember pulling the diaphragm out and thinking, "Man, that thing sure stiffened up!"

    Well, after reading litefoot's post I got to thinking about that on the way home so I checked it out as soon as I got to my garage. Sure enough the old gasket was stuck to the diaphragm!

    I opted to just install the gasket and try it out. The way I figure it (esp after reading a lot of AS posts), changing only one thing at a time will help to determine what the real problem is.

    So, now I have the missing gasket on and I pull the choke out and give it a pull .... Success - It fired right up!!

    I'm going back out after supper to fine tune it. If it tunes properly then I will not mess with the metering lever.

    Thanks for the help fellas!

    There should be a blushing emoticon here for guys like me who end up making simple mistakes. :D

    I repped you guys where I could (gotta spread it around first before I rep Brad again) and I really appreciate your advice.

    Thanks again!

    :cheers: :cheers:
     
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