Announcement

Collapse
No announcement yet.

Unclear on needle shimming on VM 26

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Unclear on needle shimming on VM 26

    I see people suggesting that you remove the plastic spacer above the needle, and substitute washers in its place. I have a midrange rich condition, and I was planning on dropping the circlip one position, and then shimming between the circlip and the forked follower, in essence dropping the needle by 1/2 a position. I understand removing the plastic spacer and using washers totalling half the height of the spacer to enrich the midrange, or dropping the circlip down one position and shimming to achieve a 1/2 half lowering of the needle. Am I looking at this all wrong? I would figure that the plastic spacer should be at the top, against the underside of the slide. I would greatly appreciate opinions. I've done searches, but never found the rationale of the first method over the my somewhat unclear reasoning
    1979 GS 1000

    #2
    Your confusing the VM and BS carbs

    The procedure you mention is for the BS carbs

    On your VMs, the needle has slots for the clip

    Pull the slides, pull the needles and move the clips up one notch (thus lowering the needle)

    Reassemble and you're good to go

    Also, with 900 posts, you should know to put your bike in your signature (rant concluded)
    1978 GS 1000 (since new)
    1979 GS 1000 (The Fridge, superbike replica project)
    1978 GS 1000 (parts)
    1981 GS 850 (anyone want a project?)
    1981 GPZ 550 (backroad screamer)
    1970 450 Mk IIID (THUMP!)
    2007 DRz 400S
    1999 ATK 490ES
    1994 DR 350SES

    Comment


      #3
      You can and sometimes need to use a shim/washer on VM carbs to achieve the correct AFR in your midrange performance. If you're marginally too rich, drop the needle by one notch then place the washer underneath the clip to gain a half position.

      I would just try lowering the needle by one clip position first. It may only need that change to optimise performance.
      :) The road to hell is paved with good intentions......................................

      GS 850GN JE 894 10.5-1 pistons, Barnett Clutch, C-W 4-1, B-B MPD Ignition, Progressive suspension, Sport Demons. Sold
      GS 850GT JE 1023 11-1 pistons. Sold
      GS1150ES3 stock, V&H 4-1. Sold
      GS1100GD, future resto project. Sold

      http://i155.photobucket.com/albums/s...s/P1000001.jpg
      http://i155.photobucket.com/albums/s...s/P1000581.jpg

      Comment

      Working...
      X