original carb

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original carb

Postby Glynny » Fri Jan 08, 2021 8:18 pm

hi i want to fit the correct carb to my matchless 350 g3ls no55G3LS27049 it has an amal 376 on just now which is badly worn so if i buy new i want to put the correct part on which looks like the pre monobloc type but which part number all help much appreciated

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Re: original carb

Postby ajscomboman » Fri Jan 08, 2021 8:47 pm

Amal monobloc 376 1 1/16" No3 slide main jet 210 pilot 30 needle jet 106 and needle in middle notch Club No. (376/17) tell them what jetting you require and they'll set it accordingly.

All this is assuming that the head is as per spec from the factory.

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Re: original carb

Postby alanengineer » Sat Jan 09, 2021 11:04 am

55 G3l has a 376 monobloc carb, pre monobloc carbs are for the years earlier.

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Re: original carb

Postby ajscomboman » Sat Jan 09, 2021 1:44 pm

alanengineer wrote:55 G3l has a 376 monobloc carb, pre monobloc carbs are for the years earlier.



Who mentioned pre-monobloc?

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Re: original carb

Postby clive » Sat Jan 09, 2021 2:48 pm

ajscomboman wrote:
alanengineer wrote:55 G3l has a 376 monobloc carb, pre monobloc carbs are for the years earlier.



Who mentioned pre-monobloc?


The original poster mentioned pre-monobloc :headbang:
clive
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Re: original carb

Postby ajscomboman » Sat Jan 09, 2021 5:54 pm

clive wrote:
ajscomboman wrote:
alanengineer wrote:55 G3l has a 376 monobloc carb, pre monobloc carbs are for the years earlier.



Who mentioned pre-monobloc?


The original poster mentioned pre-monobloc :headbang:


Bugger me so he did in the last bit of the post which I didn't bother to read as I knew it was a 376 monobloc for 55.

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Re: original carb

Postby Glynny » Mon Jan 11, 2021 8:07 pm

the bike was registered in 1954 on my docs does this mean the engine has been changed at some point

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Re: original carb

Postby SPRIDDLER » Mon Jan 11, 2021 8:29 pm

If it was manufactured after Sept 1st 1954 (i.e. after the factory annual holiday shutdown) it will be to 1955 specification. 1955 was the first year that Monobloc type carbs (the 376) were fitted to the 350's. If it was first registered any time in 1954 your V5 will show 1954.
Your engine number shows it as a 1955 engine which would be correct if the bike was manufactured after Sept 1st 1954.
You can get details from the factory records (prob the original engine and g/box nos) by using the club's Dating service here:

http://www.jampot.com/Dating.asp
I poke badgers with spoons.....from 2 metres.

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Re: original carb

Postby Glynny » Sat Jan 16, 2021 11:03 am

just recieved my new 376 from our parts shop spoke to chap in spares dept and he said the correct set up for my 55 numbered engine was 200 main jet,30 pilot jet,106 needle jet 3.5 slide and needle height 3 as per amal specifications . also do i need to remove the choke slide as my old carb had it removed and the hole for cable sealed

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Re: original carb

Postby Mick D » Sat Jan 16, 2021 11:31 am

Hi

Unless you intend to fit an air lever and cable you will have to remove the air slide, spring and brass tube. Blank the adjuster with a blob of silicon sealant, easily removed if you decide to fit the choke assembly in the future.

I prefer to have the choke as it allows the mixture to be varied as the engine warms up.

Regards Mick

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