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Amal pilot jet

Submitted by graham_martin on Sat, 10/08/2019
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Heavy Twins

I'm recommissioning my monoblock 376 carb from my 1958 Domi 88. 

Can anyone give me a really simple answer (ie avoiding the tons of technicality I have been wading through on the Internet for the last 3 hrs!) as to how I set the pilot jet. Does it screw all the way in or is there some other setting?

Submitted by robert_tuck on Sat, 10/08/2019

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The pilot jet is screwed all the way in and covered with a steel cap.  The pilot mixture screw is usually around 11/2 turns out  but can be sensitive to a 1/4 of a turn when you are close to the ideal setting.If the mixture screw has to be nearly all the way in then the jet is partially blocked or too small. If the mixture screw has to be further out it likely the jet is too big or loose.or the fuel level too high. Adjustment of the pilot can only be made with a properly warmed up engine and at slow revolutions to avoid other phases of the carb action interfering with the mixture.

Submitted by anthony_curzon on Sat, 10/08/2019

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The Norton handbook, and workshop manual will give you all the relevant details that you require. Amal, also issued an operating leaflet for their carbs, so you may still be able to get one from them.

Submitted by john_holmes on Sun, 11/08/2019

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Starting position to get you going is air mixture screw out 1 and 1/2 turns, once the engine is nice and warm you screw in and out to find fastest idle revs and then lower to correct idle speed using throttle slide stop screw.

Submitted by graham_martin on Thu, 22/08/2019

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Thanks Robert 

With the jet having so many threads I thought there must be some kind of setting. All the way in it is & the bike is now ready for some test runs. Funny that this is not made clear in any of the Norton literature.

Another Domi back on the road after some 40 years in bits!

 


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