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villiers mk 25 cut off switch

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villiers mk 25 cut off switch

Post by corribella on Wed Jan 21 2015, 22:09

hi I have been given a cut out switch for my mk 25,i normally shut off the fuel supply to kill engine.can anybody tell me where the connections are.the switch is a rocker type which I think bolts onto the block

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Re: villiers mk 25 cut off switch

Post by Woodsman on Thu Jan 22 2015, 17:05

Hi Corribella,

This had me foxed too.
My instructions and parts book shows a connection from LT on the contact breaker which leads to an insulated terminal which emerges from the rear of the magneto backplate. The cut-off switch just connects this terminal to earth, i.e anywhere on the body, thereby shorting out LT and stopping the engine.
However, on my MK25 there is no such post. If you haven't got the instructions and parts book just PM me and I'll send you a copy.
Just out of interest my MK10 does have this arrangement and I used a vintage pull/push battery isolator switch to act as a cut-off.

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Re: villiers mk 25 cut off switch

Post by corribella on Thu Jan 22 2015, 17:43

right I have a insulated screw with 2 nuts on the rear of stator plate,taken the wire from coil running down the back of plate cuts off the spark no matter what position of the rocker switch.when I disconnect the wire from switch I get a spark and can run the engine as normal

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Re: villiers mk 25 cut off switch

Post by kev on Thu Jan 22 2015, 17:59

Hi Corribella
Are you sure the switch cuts off the fuel supply or does it earth out the spark.

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Re: villiers mk 25 cut off switch

Post by kevjhnsn on Thu Jan 22 2015, 18:02

this is one of the original villiers mk20- 25 stop switches
seen in silver and brass up rear of back plate


will try to find some pics of internal wiring or take some from another villiers engine or back plates from shelfs

but in the mean time on the later versions of backplates, also found fitted from mk7 to 25

there is or needs to be a 2nd wire from  the LT side of coil that goes to the insulated  screw /bolt  through the backplate, then there is a 2nd contact screw/bolt that goes to earth with a springy brass or tin switch contact you push to close the circuit
so when running you push the contact to earth it out to the backplate and stops engine with lower lower tingle factor on you fingers than the springy tin lever screwed to the top off cowling via cowl fixing bolt" bit more shocking HT side"
kev


Last edited by kevjhnsn on Fri Jan 23 2015, 15:22; edited 1 time in total

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Re: villiers mk 25 cut off switch

Post by Woodsman on Fri Jan 23 2015, 10:27

Two suggestions:

1) Switch is goosed,
2) Insulated post isn't insulated properly.  There should be a top hat shaped bush (37) that goes through the backplate and an insulated washer to match(38).  Maybe the post is being earthed as soon as it's in place.



Check both ideas with a meter or light bulb and a battery.

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Re: villiers mk 25 cut off switch

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