Hey guys, I'm having an issue with my mini that hopefully someone with more knowledge than I can help with. Basically I've got an lambda gauge fitted and when I'm driving the fuel/air ratio is pretty good, not perfect but usually sits about 12.1:1 to 14:1 under acceleration and when I'm holding the throttle to maintain speed, the issue arises when I need to change gear or slow down. As soon as I release the throttle the meter immediately shows lean and you can actually feel the car lurch because of it then it settles back to normal, I've been trying to drive by slowly reducing the speed I bring the throttle up to get me by the now until I can resolve this issue which isn't ideal.
I've got a HIF44 carb fitted with a BBA needle, red spring and ram air pipe, Amethyst ignition and a slightly worked head with a standard cam. Could the spring be forcing the dashpot down too quickly? My only thought at that is because I figure if the dashpot came down too slowly it would suddenly run rich because the needle would be supplying more fuel then air?
Hopefully someone actually knows their stuff unlike me and can point me in the right direction.