Villiers engine running rich

[futtock]

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?

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[wristpin]

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

[charlie]

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

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[charlie]

Extract from manual for Mk20 and 25 engines.

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[andyfrost]

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.

[Author]

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