AJS & Matchless Owners Club

markwhitelock wrote:My ‘56 G80 is all back in one piece, I've managed a couple of test rides up the road but it is bogging down around half throttle,

I would also put that down to the possibility of the auto A/R not advancing. An overtight mag chain can cause that.

I've been trying to wind out the mixture screw ever so slightly

Mark, just so that there's no confusion (mine mostly) the choke is 'Off' when the cable is tight.
I assume by 'mixture' screw you are referring to the Pilot screw. It is in fact an air regulating screw and winding it out allows more air to pass to the Pilot jet, weakening the mixture - Item No. 29 in the dia below. This is normally around 1 1/2 turns open (unscrewed from fully in). Anywhere between about 1 and 2 turns unscrewed is normal.

Screw no. 30 is the slow running adjustment by which you adjust the tickover. It merely moves the carb slide up or down as you would when operating the throttle.
My reply crossed with Mick's.

markwhitelock wrote: Whoops. That's a bit embarrassing...

Do it seems the carb may be ok

Don't be embarrased think of it as an easy fix!