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Fuel/air screw question

Discussion in 'The Garage' started by DB90, Aug 12, 2019.

  1. 5twins

    5twins XS650 Guru Top Contributor

    That Niche Cycle link says the screw is aftermarket. It may not be possible to get all the stuff from one place unless you go with the $5 Yamaha plugs.
  2. Jim

    Jim The thrill of victory and da agony of da feet. Top Contributor XS650.com Supporter

    My bad. Niche showed it as OEM when I linked it.... when you click on the link, it's not. Go figure... :doh:
  3. xjwmx

    xjwmx XS650 Guru Top Contributor

    Your dried plugs might be okay. Mine are kind of dried too but they're still a tight fit. But if you're going to place an order to a dealer anyway... Def. get oem screws from a dealer. You'll also want that o-ring, which is included.
    DB90 likes this.
  4. DB90

    DB90 XS650 Enthusiast

    I ordered some new screws. We'll see if that helps at all.

    However, the head on one of the old ones is pretty stripped out. I don't think I'll get it out without totally stripping it. Anyone ever have to tap one of these guys out? I have tiny drill bits and extractors, so that's not an issue.
    gggGary likes this.
  5. xjwmx

    xjwmx XS650 Guru Top Contributor

    On a different bike with a BS34 I had to use a Dremel tool to keep re-cutting the slot. Half a turn, make a new slot, half a turn, make a new slot....until it turned freely. A cylindrical bit will make the best slot. Back then we didn't have good mix screw replacement info but I lucked onto a carb that was being parted out...because it wouldn't work no matter what anyone tried to do with it :D I would not use extractors. Especially on brass since they will prob just expand it and make it tighter.

    A screwdriver that's a bit and a bit handle is a lot better than a regular screwdriver. The bit's faces are parallel at the tip instead of tapered, which makes a huge difference.
    DB90 and gggGary like this.
  6. gggGary

    gggGary Stop that! Top Contributor XS650.com Supporter

    Whut XJ sez! Use corrosion buster of some sort.
    This trick may get you through, I've rescued several BS34's this way. Post #16
    Carbs, carbs, carbs
    As always don't JUST keep turning the screw OUT ,if you have movement also turn it back in a bit anytime the screw starts to bind. Blow out any swarf you have made, keep area juicy with lube.
    A more drastic solution:
    Yes (re)slotting using a cut off wheel in the dremel is expedient and works. To make it clear you will be slotting the idle screw tower on the carb body also.
    here's a link http://www.xs650.com/threads/bs34-idle-mix-screw-issue-ideas-wanted.54337/

    DO NOT try an easy out, that is about a sure way to ruin a carb body.
    Last edited: Aug 16, 2019 at 8:24 PM
    Jim and DB90 like this.
  7. DB90

    DB90 XS650 Enthusiast

    Awesome. Thanks for the tips guys!
    The PO had already cut a new slot in the left side with a Dremel. I'll have to use Gary's method to cut a new slot since I don't have a Dremel at the moment.

    My new screws should be here Tuesday though. Woohoo!
    gggGary and Jim like this.

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