Carburetion question

Information relating to the Matchless G12 or AJS Model 31 650cc twin
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Re: Carburetion question

Postby clanger9 » Mon Jun 18, 2018 8:41 pm

Rob is right: classic symptom of a worn slide. A new slide might fix it, but often it doesn't.
However, it's strange that you would have a loose slide on a new Monobloc. This clearance is super-critical and there certainly shouldn't be any "rattle" there.

Ultimate cure is either a new carb or (even better) get Martyn Bratby to re-sleeve it. My Amal "hold up" issue was completely cured by a re-sleeve and the bike ticks over perfectly now.
1966 AJS Model 14 250 CSR "cafe racer"
1993 Ducati 750SS

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Re: Carburetion question

Postby ajscomboman » Tue Jun 19, 2018 5:36 am

clanger9 wrote:Rob is right: classic symptom of a worn slide. A new slide might fix it, but often it doesn't.
However, it's strange that you would have a loose slide on a new Monobloc. This clearance is super-critical and there certainly shouldn't be any "rattle" there.

Ultimate cure is either a new carb or (even better) get Martyn Bratby to re-sleeve it. My Amal "hold up" issue was completely cured by a re-sleeve and the bike ticks over perfectly now.


All the new carbs (well the ones I've bought) have excessive clearance between slide and body compared to the originals. The latest one for the G80CS has been the worst as the 3thou oversize slide went straight in!

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