This thread is for the carburetor aficionados amongst us.
I am running the Shadow on a pair of Amal standard carbs 1949/54 and the plugs run for 300ish miles before fouling up.
Air screws are set for optimum running at tick over.
I had the same problem with the BSA Goldstar so I lowered the throttle slide needle one notch and hey presto no more running rich and I achieved a decent tick over.
I have not looked at a diagram of the Shadow carbs so don't know if the slide needle is graded with notches but that aside would consider lowering the needle to cure a rich running engine with the existing needle jet?
I am running the Shadow on a pair of Amal standard carbs 1949/54 and the plugs run for 300ish miles before fouling up.
Air screws are set for optimum running at tick over.
I had the same problem with the BSA Goldstar so I lowered the throttle slide needle one notch and hey presto no more running rich and I achieved a decent tick over.
I have not looked at a diagram of the Shadow carbs so don't know if the slide needle is graded with notches but that aside would consider lowering the needle to cure a rich running engine with the existing needle jet?