Amal concentric pilot jet bush

baz · Dec 4, 2023

It's well documented that Amal went from a pilot jet screwed into the float chamber
To a pilot jet bush
The reason was given is the signal from the engine was too weak for a jet so far away I believe
Has anyone on here tried drilling the pilot jet bush out,and reinstating the screw in type just to see if it works?

johnm · Dec 4, 2023

baz said:
It's well documented that Amal went from a pilot jet screwed into the float chamber
To a pilot jet bush
The reason was given is the signal from the engine was too weak for a jet so far away I believe
Has anyone on here tried drilling the pilot jet bush out,and reinstating the screw in type just to see if it works?

A very common mod down here. Friend has done dozens of carbs. Mostly so you could clean out the idle mixing passages properly. Not so common now the Premiers have come in.

baz · Dec 5, 2023

johnm said:
A very common mod down here. Friend has done dozens of carbs. Mostly so you could clean out the idle mixing passages properly. Not so common now the Premiers have come in.

Yep I have drilled the back of the carb and fttting a plug so I could rod the pilot bush properly
I was wondering if anyone here had direct experience of before and after drilling out the bush and adding a pilot jet into the redundant threaded hole
And if the reason that Amal give is actually correct
Or maybe just cost cutting maybe?