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How many turns out is the air screw on stock YFZ450's?

This is a discussion on How many turns out is the air screw on stock YFZ450's? within the Yamaha YFZ450/450R (2004-Present) forums, part of the Performance /Technical category; I have cam mod, ESR + K&N, GYT-R pipe, 170 main, NCVP pin on 4'th clip,45 pilot, sea level 70 degrees. Runs really good now ...


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Old 07-30-2004, 06:33 PM   #1
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Default How many turns out is the air screw on stock YFZ450's?

I have cam mod, ESR + K&N, GYT-R pipe, 170 main, NCVP pin on 4'th clip,45 pilot, sea level 70 degrees. Runs really good now but have never touched the air screw. Running a 80% C12 mix for drags with stock compression.

Should I turn my air screw out a 1/4 turn or should I leave it stock? What is stock position? Thanks for any help.

Hope I remember my camera as I want to try to post a few pic's as this site needs more. I remember salivating when Selector posted his quad.
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Old 07-30-2004, 07:02 PM   #2
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mine was 1.5 turns out from the factory...

...now with Big Gun complete, Pro-Flow K&N, and cam mod I am at 2.5 turns out with a 142 main jet (8000 foot setting) or 150 main jet (1000 foot setting) and Dyno-Jet needle at position 5

(note these are Dyno-Jet sizes, others have different size numbers)

I would guess you need to come out to 2 turns on your air pre mixture screw.
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