Just lift the throttle at the carb end.
Screw the nut in to make it leaner, that's anti clockwise as look from above. Half a turn at a time is more than enough. A lifting pin is really handy on a Mini carb, because of the inlet elbow. You can bend a bit of stiff wire to make a "piston lifting hook" if there isn't one - in place of the Twist screwdriver twist.
The aim is to adjust the mixture to get the highest idle speed possible, that indicates the fuel/air mixture is in the right proportions to burn most efficiently.
so the sequence is;
set the idle (800-900rpm)
adjust the mixture
readjust the idle if needed
When it's right lifting the piston will cause the revs to briefly rise ('because there's less restriction) before settling back to the same or slightly less rpm as the mixture gets too weak. If the revs increase and stay higher it's too rich - if it really struggles or stalls it's too lean.
Remember the vrum, vrums: adjust - rev - check... that's the fun bit
Okay going to eat then get to this... really want to sort this before tomorrow so i can get to work okay. Otherwise gotta pull out the pedal bike
when you say vrum vrummm do i just whack it up to 2000-3000 revs then straight back down or keep it at 2/3000 for a while then drop?
