How many turns out is the air screw on stock YFZ450's? - Yamaha ATV Forum
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post #1 of 2 Old 07-30-2004, 06:33 PM Thread Starter
Join Date: Apr 2004
Location: N.B. Canada
Posts: 61
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.
maddog05 is offline  
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post #2 of 2 Old 07-30-2004, 07:02 PM
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Join Date: Jul 2004
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mine was 1.5 turns out from the factory... 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.
Dracos is offline  

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