AMAL Carb

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
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AMAL Carb

Postby dada » Mon Apr 08, 2019 2:06 pm

Hi,

My Bike G2 is fitted with Amal Carb 376, I got a kit of Amal 375 by mistake do parts all fix as needle seems longer or 376

What are main difference between them.

Regards

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Re: AMAL Carb

Postby dave16mct » Mon Apr 08, 2019 2:32 pm

The 375 is a smaller carb for Bantams etc. Slide is narrower, needle is shorter. You will have to see your handbook/manual for the carb jets etc then order from Amal. You may be able to send the 375 kit back?
Cheers Dave.

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Re: AMAL Carb

Postby Paul R » Mon Apr 08, 2019 2:35 pm

As I understand it needles are different for lengths for different carb series . ( assuming we are talking about the main throttle needle and not the float cut off needle ) . There should be a very small letter stamped somewhere on the top of the needle. "B" for 375 ,"C" for 376 , an "D" for 389 s. So you need a "C" needle If you look on he amal carb web site it shows this . There is also some information somewhere on the web giving the measurements of each if you do a bit of a search. Can't remember where but I did find it not too long ago when looking for the same information as yourself . Cheers .

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Re: AMAL Carb

Postby dada » Mon Apr 08, 2019 2:42 pm

All other parts fitted perfectly apart from needle. What do you think shall we try to start the bike ?

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Re: AMAL Carb

Postby dave16mct » Mon Apr 08, 2019 3:16 pm

No , if you do it will run very rich with the shorter needle. Get the correct jets, slide and needle.

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Re: AMAL Carb

Postby SPRIDDLER » Mon Apr 08, 2019 4:26 pm

If you're impatient to get the engine running after rebuild (I would be) why not use the needle that was already in the carb when you were previously trying to start it? (Assuming it was the correct needle). The needle is unlikely to have worn so much that it prevents the engine from running. You can fit the new one when it arrives.
I poke badgers with spoons.

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Re: AMAL Carb

Postby Rob Harknett » Mon Apr 08, 2019 4:50 pm

dada wrote:All other parts fitted perfectly apart from needle. What do you think shall we try to start the bike ?

Parts may all fit but not be correct.

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Re: AMAL Carb

Postby dada » Mon Apr 08, 2019 10:18 pm

needle left the old long one main jet is the same some put in new one, even seals and everything seems the same.

Put in some petrol tried starting but still in vain

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Re: AMAL Carb

Postby Richard Hyatt » Tue Apr 09, 2019 7:48 am

I think it should be a 376/99
With a 180 main , 3 and 1/2 slide and needle in central notch.

So if you have a 375 it's a shade small bore for the bike , but it should still start.

Have you ever had it running ? In your ownership ?
If not you have multiple unknowns , spark , fuel , compression.
Have you verified these?

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Re: AMAL Carb

Postby dada » Tue Apr 09, 2019 7:56 am

Attached Picture of the carb number

I bought bike off ebay in my ownership all in pieces worked had on engine to get it rebuild and fixed on frame.

Piston seems good compression when you kickstart it. Spark there is

Fuel I think is the problem rebuild the carb but got the kit of 375 left the needle of what it had as longer seals and main jet are the same.

Carb had some missing parts like float piston and jet.

Any assistance will be great maybe we get it started at least
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