Villiers engine running rich

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This topic contains 4 replies, has 4 voices, and was last updated by  andyfrost 4 weeks ago.

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  • #31271

    futtock
    Participant

    The newly overhauled Villiers engine of my Geest autotruck runs very well indeed until the spark plug soots up heavily, very soon after starting – presumably because it is running too rich. I have removed the air intake choke in case that is the cause. Forgive my ignorance but can somebody advise on carburettor mixture adjustment – see picture. Presumably the adjuster is the knob and locknut on the left of the picture? Does it screw in or out to weaken the mixture?

    Attachments:
    #31273

    wristpin
    Participant

    No mention of what model Villiers and can’t see enough of the carb to see exactly what you have!

    #31274

    charlie
    Keymaster

    A number of carburettors were fitted to Villiers engines, photo below is extract from manual for the MK15 engine.

    Attachments:
    #31277

    charlie
    Keymaster

    Extract from manual for Mk20 and 25 engines.

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    #31280

    andyfrost
    Participant

    The most common carb is the one in picture 3 , the main adjuster is the one at the very bottom of the carb , undo locking backnut , wind in slightly for a weaker mixture.

    Andy.

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