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  1. #1

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    Help with ZDZ 40

    I have a used ZDZ 40 side exhaust with 10+ gallons through. I recently sent it to RC Showcase for service: the carb was replaced with a new Bing along with the prop hub and gaskets. Now the engine starts, at least, but from full throttle to idle, the engine bottoms and dies. If I throttle down gently or modulate the throttle, it stays running. Needless to say this is a problem.

    RC Showcase bench ran it and said it checked out ok.

    Right now the engine's an expensive door-stop, can anyone suggest a fix/adjustment?

    Thanks

    Steve

  2. #2

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    RE: Help with ZDZ 40

    richen that low end
    smooth as silk!

  3. #3

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    RE: Help with ZDZ 40

    All my ZDZ 40 problems went away (starting, idle, transition) when I re-gapped the plug (tighter). I think the recommended gap is just ever-so-slightly too large.

  4. #4

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    RE: Help with ZDZ 40


    ORIGINAL: butlern

    All my ZDZ 40 problems went away (starting, idle, transition) when I re-gapped the plug (tighter). I think the recommended gap is just ever-so-slightly too large.

    Hey Butlern,,,,,what gap did you end up with?? I can't get my ZDZ 40 RVL to idle lower than 2350 or it dies.

    CHris

  5. #5

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    RE: Help with ZDZ 40

    Been a while since I did that, Chris. I'll have to go out into the -20 degree garage and pull the plug to check. Man, it's cold in Iowa this week!

    I'll be in touch tomorrow or Sat with that info.

    Regards,

    Noah

  6. #6

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    RE: Help with ZDZ 40

    Chris, did you ever get the idle issues sorted out? Sorry I totally forgot to check on the plug gap for you. But, I did manage to have a look today. My gap is set at 0.019"

    Might be worth a shot.

    Good luck.

    Noah


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