Matchless 600 Twin Pistons and rings??

Information relating to the Matchless G11 or AJS Model 30 600cc twin
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Matchless 600 Twin Pistons and rings??

Postby g11csr » Fri Jan 28, 2011 9:28 pm

I am restoring a 1958 Matchless G11CSR 600 Twin.I have original wire wound piston without rings. I bought rings from Jampot spares but have now heard that they may not fit my pistons. They are GPM rings. Is this true? Why is this? and will i need to buy new pistons? The rings fit and look ok except the chrome plated top ring is not marked top...should it be as the oil ring is marked top.

Thanks for any help.

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Matchless 600 Twin Pistons and rings??

Postby wilko » Fri Jan 28, 2011 10:38 pm

If there is no visible chamfer or bevel inside or outside it shouldn't matter.

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Matchless 600 Twin Pistons and rings??

Postby burrage » Sat Jan 29, 2011 10:22 am

I understand that the rings available from Jampot Spares are for the pistons they are currently selling, and these have either deeper or wider grooves than the original AMC pistons. You must check that the rings you have will fit in the piston grooves, so that they will go flush with the piston surface.

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Matchless 600 Twin Pistons and rings??

Postby moley » Sat Jan 29, 2011 6:46 pm

i had the same problem funny enough with a 58 g11csr that i am currently restoring. i went to turner and cox and they had a set only about a month ago phone John on 01425 652627 ..excellent service

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