G12 1959 650cc Head gasket

Information relating to the Matchless G12 or AJS Model 31 650cc twin
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Charles.
Deceased
Posts: 93
Joined: Wed Oct 12, 2005 10:45 pm
Location: CORNWALL UK

G12 1959 650cc Head gasket

Post by Charles. »

Is there a correct way to fit the head gasket as it appears to fit either way up? The gasket I intend to use has copper inside ring.

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Eric
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Joined: Fri Jan 01, 1993 12:00 am
Location: WEST MIDLANDS UK

G12 1959 650cc Head gasket

Post by Eric »

If they are the ones from Jampot Spares they go either way. You must follow a regime of pulling down the head (COLD) after running for 1, Just a warm up, 2 A short run of a few miles, 3, A longer run or runs up to about 50 miles. 4, Another 500 miles. Dont go overboard by overtightening to cut this procedure out as the studs can fail quite easily.
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