Leaking Carburettor

Information relating to the Matchless G11 or AJS Model 30 600cc twin
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Re: Leaking Carburettor

Postby Andy51 » Fri Nov 30, 2018 8:38 pm

I know very little about carbs but I recently fitted a Concentric Mk1 to my 18S and that leaked from tickler and jet in Venturi - problem was the float bowl gasket which trapped float pivots, holding float open. Cut away offending parts of gasket, and hey presto! no more leaks. Don't know if this is relevant to your issue, but may help. Andy

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Re: Leaking Carburettor

Postby Peter Morris » Fri Nov 30, 2018 8:59 pm

clanger9 wrote: the little bump on the cover that tells you where the fuel level is supposed to be will be in slightly the wrong place


I have heard this many times before, but how can you see if the fuel level is where the bump is? Remove the banjo and look inside?

Another thing to watch out for with a leak on a Monobloc is make sure there is no fibre washer between the carb body and the needle seating, a washer here stops the needle seating properly.

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Re: Leaking Carburettor

Postby cbranni » Fri Nov 30, 2018 9:09 pm

To view the petrol level in the float chamber remove the pilot jet hexagon cap and fit a clear length of pipe to the pilot jet, hold the pipe along side the tit on the chamber cover when the petrol is switched on the petrol should be level with said tit without tickling.

Also it can be checked by replacing the float chamber cover and replacing it with clear Perspex cover with a line scribed at the same height as tit on original cover.

I have used both methods without problems.

Colin
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Re: Leaking Carburettor

Postby Peter Morris » Fri Nov 30, 2018 10:38 pm

Thanks Colin, I'll give the clear pipe a go.

Peter

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Re: Leaking Carburettor

Postby SPRIDDLER » Fri Nov 30, 2018 10:47 pm

If it's the wrong height you can get a fuel level adjusting kit........

http://amalcarb.co.uk/washer-kit-for-se ... ttors.html
I poke badgers with spoons.

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Re: Leaking Carburettor

Postby Duncan » Fri Nov 30, 2018 11:31 pm

Peter Morris wrote:Another thing to watch out for with a leak on a Monobloc is make sure there is no fibre washer between the carb body and the needle seating, a washer here stops the needle seating properly.


Hi Peter, this is where life gets complicated as originally there was no washer fitted nor should the be, however the latest generation/newly manfactured monobloc do have a washer there and one is supplied in the Amal gasket sets.

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Re: Leaking Carburettor

Postby Peter Morris » Sat Dec 01, 2018 7:22 pm

Duncan wrote:
Peter Morris wrote:Another thing to watch out for with a leak on a Monobloc is make sure there is no fibre washer between the carb body and the needle seating, a washer here stops the needle seating properly.


Hi Peter, this is where life gets complicated as originally there was no washer fitted nor should the be, however the latest generation/newly manfactured monobloc do have a washer there and one is supplied in the Amal gasket sets.


:headbang: :headbang: :headbang:

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