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Motorcycle Discussions => British Bikes => Topic started by: Totallyconfused on April 12, 2023, 06:27:15 AM

Title: Piston Ring 50mm X 2.5mm Villiers 1951 Monet Goyon
Post by: Totallyconfused on April 12, 2023, 06:27:15 AM

Hi, I am looking for two new piston rings, 50mm by 2.5mm.

They came from a Villiers 100cc, 1951 Monet Goyon engine.  I tried to attach some pictures but guess they were too big?

Does anyone know where I can get replacements from?

Thanks

Title: Re: Piston Ring 50mm X 2.5mm Villiers 1951 Monet Goyon
Post by: Vreagh on April 12, 2023, 07:49:56 AM

Cox & Turner ltd, Yeovil. 01935 826818. Never failed me.

Title: Re: Piston Ring 50mm X 2.5mm Villiers 1951 Monet Goyon
Post by: 33d6 on April 12, 2023, 09:29:10 AM

Just remember it is not a Villiers engine made by the Villiers factory. It is an engine made by the Monet Goyon factory under licence from Villiers. Monet Goyon made a good engine but don’t expect Monet Goyon and original Villiers parts to be routinely interchangeable. You’ll mostly be disappointed.
Making an engine under licence does not mean making a carbon copy. It means getting permission to use someone else’s ideas.
Best of luck with your search.

Title: Re: Piston Ring 50mm X 2.5mm Villiers 1951 Monet Goyon
Post by: Totallyconfused on April 12, 2023, 06:24:36 PM

Many thanks for your replies.

It may be quite hard to find the rings.  The piston actually measure 49.71mm. The rings do not have flat ends, but are bevelled at a 45 degree angle.  There is a brass divider in the piston groove at a 45 degree angle to stop the rings spinning.

I was hoping that if I bought 50mm rings, I can cut the ends down at 45 degree angles and reduce the size.  Is this possible?

Title: Re: Piston Ring 50mm X 2.5mm Villiers 1951 Monet Goyon
Post by: Totallyconfused on April 12, 2023, 06:41:50 PM

Some pics

Title: Re: Piston Ring 50mm X 2.5mm Villiers 1951 Monet Goyon
Post by: Totallyconfused on April 12, 2023, 06:43:04 PM

Sorry having problems with pictures.

Title: Re: Piston Ring 50mm X 2.5mm Villiers 1951 Monet Goyon
Post by: Totallyconfused on April 12, 2023, 06:46:16 PM

The engine....phew, got there in the end.

Title: Re: Piston Ring 50mm X 2.5mm Villiers 1951 Monet Goyon
Post by: Vreagh on April 12, 2023, 09:43:31 PM

I'd still try Cox & Turner. They have supplied me with some really odd rings in the past. Just need all dimensions.

Title: Re: Piston Ring 50mm X 2.5mm Villiers 1951 Monet Goyon
Post by: R on April 12, 2023, 10:52:57 PM

Villiers Services is another possibility. ?

They might even know if MG are different.
Might .....

Title: Re: Piston Ring 50mm X 2.5mm Villiers 1951 Monet Goyon
Post by: 33d6 on April 13, 2023, 02:53:01 AM

Yes,  the photos confirm my earlier remarks. A Monet Goyon engine with absolutely no original Villiers factory content.
Monet Goyon and Villiers had a good working relationship for many years. Monet Goyon started manufacture importing Villiers engines for their bikes and were very successful. So much so pressure was brought to bear so only French made engines were acceptable. Monet Goyon responded by obtaining a licence from Villiers to make their own version of Villiers engines. That is what you have, Villiers knowledge in a French package.
The suggestions offered are utterly practical.
Just stop confusing the issue by mentioning Villiers. Stick to Monet Goyon only.

Title: Re: Piston Ring 50mm X 2.5mm Villiers 1951 Monet Goyon
Post by: Totallyconfused on April 14, 2023, 06:34:36 PM

Hi,

Once again, thanks very much for your replies.

Vreagh, I rang Cox & Turner today and spoke to Kit in the piston ring stores. He suggested I send him the piston.  I will send it on Monday, so fingers crossed they can sort me out.

They were very helpful so a great contact. Many thanks and will let you know how I get on.