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'82 XS400SE Idle mixture/pilot screws

Discussion in 'The Garage' started by classexa, Oct 10, 2017.

  1. classexa

    classexa XS400 Member

    11
    0
    1
    Sweden
    So I'm thinking of adjusting these. There are 2 right, one for each carb? Should they be adjusted the same amount of turns? Anyone know factory settings? I see different things depending on where I look. In the Haynes I got it says 1- 1 1/4. In the online manual here it says 2 1/2

    Also, it looks like I've to remove the tank to get to them. Is there a way to keep the tank connected while it's removed so I don't have to adjust, put the tank back on, then start it up etc.?
     
  2. Rides520

    Rides520 XS400 Enthusiast

    35
    3
    8
    Tucson
    Most success stories and what many would recommend as your start is from 3.25 to 3.75 turns out from lightly seated with 4 being the maximum, haven't heard of a minimum. I kept mine uniform till plug color was leading me to and end result of 2.75 on the right and 3.25 on the left if i remember correctly, i'll check my notes at home. I do quarter turn adjustments and as long as i don't observe any red flags ie super rich or super lean, i check mine once every 100 miles, eventually i'll get them dialed and i won't touch them much after that. Still tuning for the h pipe i recently added and will need to tune yet again once the bike meets its "performs flawlessly" checklist. In which i will promptly undo all my tuning and hard work for more tuning and hard work otherwise known as jetting. Idle mixture screws are part of the pilot circuit, a dirty, hard to read circuit that only effects 0-25% throttle. Good luck and keep us posted.
     
    Last edited: Oct 10, 2017
  3. classexa

    classexa XS400 Member

    11
    0
    1
    Sweden
    I heard no popping. The screw on the left carb was 3 1/2 turns out, the screw on the right carb was 4 turns out. Does that sound right? I adjusted the right screw down to 3 turns because I heard no difference between 4 and 3
     
    Last edited: Oct 11, 2017

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