Air mixture screw on amal 276

[Mark Barkntrunk]

Can someone help please. My M20 with amal 276 carb is running very rich. Plugs turn black with soot after 2miles. I have adjusted the air mixture screw outward to it's limit before it falls out. But it's still sooty and not right. None of the plugs have been wet during adjustment. What else can I do?
Thanks
Mark

[ducati2242]

Think to make it leaner you screw it in . Start at 1.5 turns out . Could be a few things though have a read of these amal set up pages .

[ducati2242]

amal set up

[ducati2242]

amal set up 2

[ducati2242]

Amal set up 3

[Dean Southall]

In addition to checking the right jets are fitted and the needle is in the correct slot have a check for flooding. This is pretty common with these bikes/carbs. New floats and float needles are readily available from Burlen, but give the float chamber a  good clean out and see if that helps first.

[Mike Farmer]

 

Its also worth checking that you have the correct slide fitted

Mike

[JulianS]

Worn needle and needle jet cause rich running.

[STAR TWIN]

Check carefully the clip holding the float needle in the float chamber. As these age, they can let go of the needle and your carb will suffer varying fuel problems, running rich being a common one.