Air mixture screw
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Stage III
Joined: Jan 2014
Posts: 3
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From: U.S.
Air mixture screw
Hello there. I am new to this forum. I have a '06 Sporty 883. Recently I installed a Dynojet carb kit. My question is this, the instruction want you to turn the Air mixture screw out 3 1/2 turn. So is that 3 1/2 complete turns or just every 1/2 turn 3 times? Thanks for your time.
Stellar HDF Member
Joined: Aug 2009
Posts: 3,212
Likes: 212
Follow the instructions at the following site: http://www.harley-performance.com/ha...arburetor.html
It's likely that 3 1/2 turns out is not the best setting.
It's likely that 3 1/2 turns out is not the best setting.
Cruiser
Joined: Dec 2013
Posts: 175
Likes: 22
From: Stuart Fl
Just some info for you and others, ...counter clockwise makes it leaner, clockwise makes it richer.
Backing it off gives it more air, hence the term "air" screw.
Most folks think unscrewing it (counter clockwise) gives it more gas, less air.
Counter clockwise = white spark plug base (too lean)
Clockwise = black/sooty spark plug base (too rich)
You want a tan/grey spark plug base, with a clean petty coat (bottom ceramic)
Backing it off gives it more air, hence the term "air" screw.
Most folks think unscrewing it (counter clockwise) gives it more gas, less air.
Counter clockwise = white spark plug base (too lean)
Clockwise = black/sooty spark plug base (too rich)
You want a tan/grey spark plug base, with a clean petty coat (bottom ceramic)
Stellar HDF Member
Joined: Aug 2009
Posts: 3,212
Likes: 212
Just some info for you and others, ...counter clockwise makes it leaner, clockwise makes it richer.
Backing it off gives it more air, hence the term "air" screw.
Most folks think unscrewing it (counter clockwise) gives it more gas, less air.
Counter clockwise = white spark plug base (too lean)
Clockwise = black/sooty spark plug base (too rich)
You want a tan/grey spark plug base, with a clean petty coat (bottom ceramic)
Backing it off gives it more air, hence the term "air" screw.
Most folks think unscrewing it (counter clockwise) gives it more gas, less air.
Counter clockwise = white spark plug base (too lean)
Clockwise = black/sooty spark plug base (too rich)
You want a tan/grey spark plug base, with a clean petty coat (bottom ceramic)
Essentially, it is a needle valve with the orifice flow controlled by the tip of the screw. It controls the amount of fuel allowed into the throttle plate bypass orifice to mix with that air.
Turning it in, or clockwise for a standard thread, will lean the mixture out. Less fuel is allowed through.
Turning it out, or counter-clockwise for a standard thread, will richen the mixture. More fuel is allowed through.
Last edited by Scuba10jdl; Jan 18, 2014 at 07:44 PM.
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