villiers mk12 running issue

This topic has 7 replies, 5 voices, and was last updated 6 years, 3 months ago by wristpin.

Viewing 8 posts - 1 through 8 (of 8 total)

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January 11, 2018 at 11:16 pm #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

January 12, 2018 at 9:55 am #27631

charlie
Keymaster

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

January 12, 2018 at 9:56 am #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.

January 12, 2018 at 8:51 pm #27635

hortiman
Participant

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

January 12, 2018 at 11:07 pm #27636

andyfrost
Participant

Firstly we need to establish which model carb you have .

Andy.

January 15, 2018 at 2:42 pm #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

January 15, 2018 at 9:20 pm #27652

andyfrost
Participant

Carefully re-check the timing.

Andy.

January 15, 2018 at 11:55 pm #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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