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Carburetors

Submitted by john_preston on Tue, 31/08/2021
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Light Twins

My Jubilee's Amal 375 monobloc carb has sprung a leak in the body and a new one is around £250.

Has anyone ever fitted a Mikuni carb to a Jubilee?  There may be a problem with the choke arrangements as my model is a 1962 Deluxe and the enclosure may get in the way.

Regards,

John W. Preston

Submitted by roger_jordan on Tue, 31/08/2021

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Have you considered ebay, or similar? There are 375s and parts for them listed, that would be an option

Submitted by dennis_thompson on Wed, 01/09/2021

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I agree with Roger that buying a second-hand 375 carb body is the way to go because I have found my Jubilee to be very sensitive to carb settings, If you go off piste with another type of carb you may face unexpected and high costs for re-jetting etc. Used Amal carb parts are common on ebay and I have bought them in the past you obviously need to make sure you get the correct bore size (25/32") which is not that common. My Jubilee uses the standard 375/43 set up so a '43' body is best. 

This list is useful:

http://porklips.org/~mason/moto/amal_specs.html#:~:text=Amal%20375%20%20%20Type%20%20%20Use,%20%203.5%20%2034%20more%20rows%20

Dennis

Would also say the 375/36 - that’s the spec for de-luxe model but works fine on a Std.  Struggled to find a 43 for my Std so modded the 36 with different cap to take a cable choke fitting

Bruce

Submitted by michael_coare on Wed, 01/09/2021

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John, I have a collection of old Monoblocs, mostly of Norton origin.

If you get stuck, PM me and I'll see if I have something suitable.

Thank you Michael but as another correspondent says, the Jubilee uses the less common bore of 25/32 (0.781 inch).

I have been looking on ebay but nothing suitable has turned up as yet.

I went on the Jubilee last night for an 11 mile run and this morning was surprised to find no evidence of a leak. Maybe one of the fibre washers that I had disturbed has bedded down and sealed itself.

Thanks to all who replied.

Submitted by dan_field on Sun, 05/09/2021

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One of the mikuni sellers offered to jet a mikuni carb for me as they hadn’t got the info to supply one, can’t remember if it was Allen’s or Motocarb. I tried a concentric but couldn’t get it to run right so bit the bullet and bought a new mono block from Surrey cycles - haven’t looked back! 

Dan 

 



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