G12 piston rings

Information relating to the Matchless G12 or AJS Model 31 650cc twin
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G12 piston rings

Postby Peteg » Mon Oct 09, 2017 3:39 pm

Hi anyone have any idea where I can buy +40 piston rings for the Pistons in photo

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Re: G12 piston rings

Postby bitza » Mon Oct 09, 2017 3:52 pm

Try F W THORNTON They are based in Telford Shropshire, carry large stocks of new old stock. They have a web site.

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Re: G12 piston rings

Postby Peteg » Mon Oct 16, 2017 8:41 am

Thanks for info

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Re: G12 piston rings

Postby BRobbo » Sat Oct 21, 2017 7:29 pm

Peteg wrote:Thanks for info



Did you manage to get the rings you wanted from Thorntons may I ask? If not did you find another source? They seem to be difficult to come by, I'm looking for 72mm +020.

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Re: G12 piston rings

Postby cbranni » Sat Oct 21, 2017 8:36 pm

You could try Cox and Turner, very good to deal with.

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only dead fish go with the flow

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Re: G12 piston rings

Postby Peteg » Sat Oct 21, 2017 9:02 pm

Managed to get them from Cox&Turner as you say very helpful

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Re: G12 piston rings

Postby BRobbo » Sat Oct 21, 2017 10:40 pm

Great thanks.

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Re: G12 piston rings

Postby BRobbo » Wed Oct 25, 2017 6:25 pm

Just to say that I can confirm Cox and Turner are very pleasant, helpful and knowledgeable people. They knew instantly what was required and I have now sent off a set of my old rings for them to replicate as the originals are now virtually unobtainable. The compression rings on these BHB pistons are much thinner than the normal Hepolite/welworthy items. The pistons are flat topped but protrude above the barrel spigot and I assume they are the original 8.5 CR albeit replacements at +020".

Thanks to the forum and to Roy and Dudley who directed me to this firm. :D

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Re: G12 piston rings

Postby Peter Morris » Sun Dec 10, 2017 2:51 pm

I also ordered rings for my 31CSR form Cox and Turner on the advice of Roy.

Ordered them Thursday afternoon and they arrived Saturday morning.... AND they had to grind them before posting them out so they'd fit narrow grooved BHB pistons.

Great service, and not at all expensive.

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