Air screw purpose

[Demonthrall]

1982 GS 550L - When I tighten the air screws, does that make it leaner or richer? Also does this actually control the air or the fuel? thanks in advance

[terrylee]

That is the only screw on this year of bike. Turning right leans it and turn left riches. terrylee

[Dave8338]

That is the only screw on this year of bike. Turning right leans it and turn left riches. terrylee

Can I get a life line on this?

Anyone?

[Guest]

I call this the idle mixture screw. Fuel is pulled from the main jet and diverted to the pilot jet because the main is blocked by the jet needle.
Air from the pilot air jet (on the filter side of carb. the jet you can remove) mixes with the fuel and goes through the idle mixture screw. This is premixed (fuel/air). The screw controlls how much fuel/air is metered during idle.
They are set lean at the factory. I do the highest RPM method by setting each idle mixture screw so the engine idles the highest. (self explanatory)
You'll need an temp tank to do this and a long screwdriver. Get a sync tool and to your carbs while your at it.

[Dave8338]

Thanks for typing the "hard work", Bill...

[Demonthrall]

so loosening the screw would richen it?

[Dave8338]

so loosening the screw would richen it?

YES

more text added to conform...

[Guest]

YES

more text added to conform...

I thought you were a non-conformist.

[Demonthrall]

thanks guys.

[Dave8338]

I thought you were a non-conformist.

Only on certain subjects!

[teddux]

1982 GS 550L - When I tighten the air screws, does that make it leaner or richer? Also does this actually control the air or the fuel? thanks in advance

Touch this screw and you are on your own for future help.
Not to mention the EPA knocking on your door.

[Guest]

Touch this screw and you are on your own for future help.
Not to mention the EPA knocking on your door.

Are you kidding?

[teddux]

Are you kidding?

I don't know.
Was the screw ORIGINALLY blanked as on the 1982 GS450?

[Guest]

I've often wondered who was in that car parked across the street at all odd hours.

[teddux]

I've often wondered who was in that car parked across the street at all odd hours.

Hmmm, who's house?