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mlts22's avatar
mlts22
Explorer II
Jan 12, 2016

Worth seafoaming a Yammy 3000 iSE before replacing carb?

Due to real life events (layoffs, friends and relatives in ICU) , I have not had time last year to do the usual upkeep on things as I should normally.

Pulled out the generator, starts at full choke after a number of pulls, and surges at no load. Add 750 watts... still surges. Add 1500 watts, smooths out, and after 2-3 hours, when the load is removed, the generator works fine (econ switch on or off.)

Had a friend of mine rebuild the carburetor. Not sure how thorough a job he did, though. Since I started a new job, and in the process of cleaning a lot of stuff out, (not to mention a renaissance faire), I don't have the time and table space to rebuild the thing myself, which is why I'd just buy a replacement, Onan-style, rather than try a rebuild.

So, before I pay the three C-notes to buy a new carb assembly, is it worth tossing four ounces of Seafoam in the tank with a gallon of gas, and letting it run, or would that just waste fuel?

44 Replies

  • Overpriced as it may be, it's 2.95C-notes cheaper than a rebuild. I haven't seen any reviews on Chemtool here but there are LOTS of reviews of SeaFoam including me. I'm not sure why you wouldn't give it a shot. personally I go with what I know works.

    PS- Ive also not heard any issues with cylinder washdown. Its a solvent just like any other. Use it according to directions and this wont be an issue.
  • mlts22 wrote:

    So, before I pay the three C-notes to buy a new carb assembly, is it worth tossing four ounces of Seafoam in the tank with a gallon of gas, and letting it run, or would that just waste fuel?


    Yes and no.

    Seafoam is overpriced for what it is.
    Berrymans B12 Chemtool is a MUCH better cleaner.

    Use two ounces per gallon of fuel and let it run only long enough to be sure the mix gets into the carb, maybe 30 minutes. Then let it sit at least overnight. If the problem really is deposits in the carb, that should fix you right up.

    If the tank wasn't full when you started, fill it up after running.
  • N-Trouble wrote:
    You have to be careful with Seafoam as it can wash down the cylinders if you use to much.

    Personally I would just pull the carb off and clean it really well. Jets are likely clogged. Shouldn't need a rebuild or any parts

    X2 but I've never had a cylinder problem adding Seafoam to the gas.
  • You have to be careful with Seafoam as it can wash down the cylinders if you use to much.

    Personally I would just pull the carb off and clean it really well. Jets are likely clogged. Shouldn't need a rebuild or any parts

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