Idle screw on a mikuni carb, which way is which setting?

[simon1221]

Basically im lookin for a:

Screw in -> richer / leaner

Screw out -> richer / leaner


Type of answer.

If it helps it is closer to the airbox, rather than the engine

Cheers
____________________
DNA50 (sorry) ->> TZR125l >> GPZ500S

[stinkwheel]

Idle screw which alters the height the throttle valve sits at (and therefore the Idle speed):

Screw in (clockwise) = higher revs.

The pilot or mixture screw which alters the fuel:air mix at tickover:

Screw in (clockwise)= richer.

Don't confuse the two!

Shouldn't really make a difference anyway, screw the mixture screw in and out by fractions until you get the highest rev speed then adjust the rev speed to tickover using the idle screw. It is more a 'by ear' thing than an 'on paper' thing, especially with an older engine.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[simon1221]

I meant pilot mixture screw.

It almost stalls at low revs when doing corners for some reason.

I did alter the fuel level in the carb, will this be it?
____________________
DNA50 (sorry) ->> TZR125l >> GPZ500S

[stinkwheel]

Probably, altering the float height will affect pretty much everything to do with the carb.

I was talking to a couple of guys the other day who were messing with their classic racer. They were bumping the float height up slightly to compensate fo the fact that their current throttle needle was too thin and making it run a bit rich and the next size up was a bit too fat.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.