air mixture screw

1 reply to this topic
  • adroncoyote

Posted March 25, 2007 - 11:23 AM


I have a '98 YZ 400 w/ white bros. exhaust. Not sure if its been re-jetted. What's a good starting point on the air mixture screw? How many turns out?

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  • grayracer513

Posted March 25, 2007 - 12:37 PM


It's a fuel mixture screw, so it works backward of a pilot air screw; out is richer, in is leaner. Start at 2 turns and work with it.

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