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2011 ARCHIVE
 VHGMC ForumsForum Archive2011 ARCHIVE
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jakeus
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Quote jakeus Replybullet Topic: mayfield no spark
    Posted: 13 Mar 2011 at 5:11pm
hi there,

iv just brought a mayfield its a mk 20 villiers engine and it has no spark iv had the points out and cleaned everything but still no joy. I was wondering if anyone could help??

thanks jake
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owen
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Quote owen Replybullet Posted: 13 Mar 2011 at 6:08pm
I used a drill to spin my Mk 15 villiers with no spark, and it worked for me. I  looking up on villiers ignition systems at the time, and found this.



 These systems are quite possibly the single biggest cause of my
ever increasing spares pile ! The villiers system was used up to the late 60's
by seagull but were replaced by the much better (in my opinion) Wipac system.
The villiers is quite fragile and usually stop working when the engine is left
sitting doing nothing for long periods. There are however some steps you can
take to make sure you don't condemn your seagull prematurely.
The first
thing is to check whether it is indeed the internal components or the externals.
I do this by removing the flywheel cover and the brass cover for the points.
Then in dim light I spin the flywheel to see if I can see a spark jumping
between the points. If there is a spark then the problem lies with the sparkplug
and/or H.T. Lead. No spark means the problem lies under the flywheel.
BUT DO
NOT REMOVE THE FLYWHEEL YET !

The next thing to do is to find yourself a
drill and a socket that will fit your flywheel nut. I have an old 1/2 inch
extension bar that has the end cut off that usually fits on a ratchet. The idea
is to spin the flywheel as fast as possible for about 2 minutes. If you take the
spark plug out you can normally do this by hand but a drill makes life a lot
easier.
Underneath that cylinder where the points are there is a small
condenser. A condenser is like a small rechargable battery and after a while the
charge in it goes completely. The older it is the quicker it loses its charge.
In order for the villiers system to work it needs a small electrical charge.
Spinning the flywheel charges the condenser up. This I have to say usually cures
any problems. You may notice that as you are spinning the flywheel that a spark
starts on the points but carry on for the 2 minutes. If there is still no spark,
it is possible to replace the condenser with an automotive one, this would
require removal of the flywheel so have a look at the tips page AND PUT THAT
PULLER AWAY !!!! If this doesn't cure your problem then I am afraid that you
have a magneto problem. You now need to test the magneto. In order to do this
you will require an electrical multimeter. If you do not own one then they are
available on Ebbayy from about 3. You need one that measures resistance and
continuity. Assuming you have a multimeter place one probe on the H.T connection
on the magneto. This is located through the hole where the sparkplug lead plugs
in under the flywheel. The other probe is placed anywhere on the ignition plate.
You are looking for a resistance of 3 to 5 kilo ohms.
You can then test the
low tension side of the magneto by touching the probe which was on the ht outlet
to the connection where the single wire comes out of the magneto. The reading
here should be less than 1 ohm. If your readings are not as specified then you
have a problem. New coils are about 130 but they can be rewound for about 60
but have to be removed first ! As an alternative the entire assembly can be
replaced with the wipac version. This involves replacing the flywheel,
baseplate, magneto and points. This will be around 60.
I hope this helps.
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lawnmowerboy
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Quote lawnmowerboy Replybullet Posted: 13 Mar 2011 at 8:31pm
youve been looking at villiers parts i reckon

you can get them from fleeabay for about twenty quid but make sure to get the right dimensions
Grow old, not up!!!
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owen
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Quote owen Replybullet Posted: 13 Mar 2011 at 9:42pm
Originally posted by lawnmowerboy

youve been looking at villiers parts i reckon

you can get them from fleeabay for about twenty quid but make sure to get the right dimensions
 
Thanks for pointing that out Will, I copied this article for further use.
These were the prices in the article, I to have seen coils cheaper on that site.
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