villiers mk12 running issue

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This topic contains 7 replies, has 5 voices, and was last updated by  wristpin 6 days, 13 hours ago.

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  • #27630

    wingnut
    Participant

    i have 2 villiers engines that i have rebuilt / restored. complete rebuild new piston, rings, re-bore, valves ect
    engine starts fine and runs well but as soon as you shut revs down it stopes
    any help please
    be nice to have the engine tick over

    many thanks steven

    #27631

    charlie
    Keymaster

    Throttle stop not set correctly allowing revs to drop to far?

    #27632

    charlie
    Keymaster

    Alternatively the throttle cable needs adjusting at top of carb, if too long it allows slide to drop to far and engine will stop. Adjusting length has same effect as opening throttle with lever ie it lifts the slide and needle.

    #27635

    hortiman
    Participant

    Are you sure that all the jets are perfectly clear, including the slow running jet?

    #27636

    andyfrost
    Participant

    Firstly we need to establish which model carb you have .

    Andy.

    #27650

    wingnut
    Participant

    Villiers v carb. With large float at bottom and primer on top.
    All jets are clean and throttle is set. And don’t have a air/ slow speed adj on this carb

    #27652

    andyfrost
    Participant

    Carefully re-check the timing.

    Andy.

    #27653

    wristpin
    Participant

    Carefully re-check the timing.

    Not just the ignition but the cam as well, one tooth out is enough to cause odd behaviour.
    Also what happens if you close the choke a smidge before shutting down.
    After the rebore etc the engine may just be a bit tight.
    This may be of assistance.
    https://www.dropbox.com/s/6w7dhhgieg4c509/Villers%20Mk12%20carb0001.pdf?dl=0

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