C15 Concentric Carb jet sizes

[Nicky Burgess]

Hi,

I am looking to fit a 22mm Amal concentric carb to my 1960 C15, I know this is a common upgrade but was wondering what jet sizes I would need to use ?

Regards,

[Spaceman]

A good starting point would be the same settings as per the original 375 Monobloc:

Main jet: 140
Pilot Jet: 25
Throttle Cutaway:  4
Needle Pos: 3
Needle Jet: 0.1055

If it is to be run without an air filter, add at least 10 to main jet size.