Amal premiers (2018)

L.A.B. said:
I can't comment on your BSA but #17 can be too weak for a Commando as Burlen/Amal has been fitting #19s to Commando 850 carbs for a while now.

News - The AMAL Carburetter Company

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amalcarb.co.uk amalcarb.co.uk
"We are now fitting size 19 Premier pilot jets as standard to 850cc Norton Commando carburettors as this has been found to perform better than the size 17 fitted to earlier versions of the carburettor."



They should have the normal (0.016") pilot bushes.
Click to expand...
thanks for the heads up on the norton jetting - i'll make note....
 
It’s definitely a bit of a mystery / grey area.
Triumph / BSA triple guys often report having to change out the 17s to 19s and that’s a much smaller carb feeding 250cc.
And I definitely had to swap 17s for 19s on my 650 Bonnie.
Yet some bikes run well on 17s.
 
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