Hi, im having trouble with my carb, my wideband shows a very rich mixture between idle and 2000 rpm when there is an amount of throttle applied. It idles fine at 14.5:1 and above this cruises at 14:1, on boost it is at 12:1 across the revs. This is really annoying me now as I know it is very rich where I spend most of the time driving, as I use the car every day. When setting off in first it jumps straght to 10:1 and hangs around there sometimes coming down to 11:1. so If im driving gently its always running rich.
My carb is jetted as follows
Main 117.5
Air corrector 1mm
1st stage enrichment 1mm (removable jet)
2nd stage jet drilled to 1.3mm
25mm venturi
.45mm idle jet
2mm needle valve, though I have tried a 1.7mm with no difference.
Ive read about running a 0.6mm 1st stage jet? would this weaken the mixture at this point in the revs, I thought it only opened when manifold vacuum became zero.
Im woundering if my 1st stage jet is not working properly, maybe its not recieving the vacuum signal to keep it shut.
I have tried alsorts, the carb has been overhauled aswell.
Ive looked down the carb when its running, theres no obvious signs of fuel dripping from anywhere.
Any help is much appreciated, cheers guys