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Joined: Jan 2021
Posts: 8
cobja Offline OP
Novice
Hello there I'm working on my very first Villiers 2 stroke which I've been told it's a 3G?. also I've got.the cylinder head off to clean things up but notice the rotation on flywheel by hand gets quite tough just before and going through TDC just as the Magnets on magneto flywheel line up with the coil ends . Questions are :

Is this normal like did they use powerful magnets back then?.it's quite tough to rotate through!

Can anyone I.d this engine?

How does this flywheel come off? the nut goes loose then just stops?! required pic below, many thanks!!

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Last edited by CyberJack; 28/01/21 10:41 PM. Reason: Change Title
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Joined: Jan 2016
Posts: 7,432
Likes: 136
SENIOR TECHNICIAN
Hi Cobja,
I don't know about the flywheel nut but from looking at it it looks like it will pop the wheel off the taper. Some magnetos were made this way to adjust the timing

1 member likes this: cobja
Joined: Nov 2013
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Forum Historian
Hello cobja and Norm
Yes, this does present as a 3G 70cc Villiers engine.

I owe this information to Vintage Mowers and to NZ collector Greg Stokes.

Below is the specification.
We know what this engine spec was used on ... the 392X means ... Scott Bonnar!
This was an AUS built engine.

Hope this helps.
-------------------------------
Jack

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Joined: Nov 2013
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Forum Historian
Hello Cobja and Norm
I can't answer the first question.
These are non-de-compressed engines.
Maybe there is simple 'good' compression.

The flywheel system is proprietary.
The nut releases the taper lock but not the flywheel.
A soft mallet should ensue ...

Help here: -
https://www.outdoorking.com/forum/ubbthreads.php/topics/103091/villiers-g-series-engines.html

Hope this helps.
-----------------------------
Jack

1 member likes this: cobja
Joined: May 2011
Posts: 97
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Atco Specialist
Hi Cobja,

Normally, the flywheel should turn reasonably freely, except for where the engine compression is at its highest. If the issue is happening with the head off then there are other items that it could be. From time to time the flywheel can be tight - it can be caused by corrosion or misalignment of the coil cheeks or just crud under the flywheel. It can also be caused by crank related problems. The extent of issues will be easier to diagnose once the flywheel is off.

In terms of getting the flywheel off, the nut is captive and sits on a taper so you need to loosen the nut until it goes tight then give the spanner a bit of a tap with a hammer and it should come free. You will need to have a way of ensuring that the engine cannot turn over when doing this to ensure that you get the nut to overcome the tension of the flywheel. Whilst I do not have a manual for these engines, the Mk 2&3 Midgets are similar in the way that they come apart and a manual is available here: https://www.outdoorking.com/forum/ubbthreads.php/topics/6293/villiers-motors-manuals.html

Edit: noted that Jack has provided a G series manual which will be of greater assistance.

Hope that this is of some assistance.

Kind regards,

Sir Chook

Last edited by Sir_Chook; 28/01/21 11:06 PM.
1 member likes this: cobja
Joined: Jan 2021
Posts: 8
cobja Offline OP
Novice
Hello guys, thanks alot for the prompt response of helpful infomation I got the fly weel off and the problem is still there, atleast I know what I'm in for now.

Will split the crank this weekend and check for pitting on the crank pin which I'm hoping it will be, should be and easy fix. If it's a bent drive shaft it will be a very long restoration trying to find replacements I think. I won't give up until the mower is restored looking like this picture!!! Scott Bonnar (Bonmow) 1950s

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Joined: Jan 2021
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Help wanted with I.D.
Couldn’t work out how to start a new post so I thought I’d reply to this.
Picked this up for $100, wants to fire, but doesn’t keep running. What spark plug would this engine use? ( it had a New long shaft plug when bought it that obviously wasn’t the right one).
Id on the engine would be appreciated, as there are no markings and I couldn’t find a date on the flywheel.

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Last edited by Walma; 01/02/21 06:49 AM.

Walma

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