The BST-40 Bible

Discussion in 'Thumpers' started by laramie LC4, May 31, 2008.

  1. Surly

    Surly surly adventurer

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    #41
  2. meat popsicle

    meat popsicle Ignostic

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    Perhaps Sudco can be of assistance Surly?
    #42
  3. Surly

    Surly surly adventurer

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    Thanks, Maybe a phone call is in order. I didn't see the little holes in the pics like the version above. Id like to order the right stuff before I have parts al over the garage :baldy
    #43
  4. meat popsicle

    meat popsicle Ignostic

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    Isn't this the type?

    Pilot Jets
    VM22/210

    [​IMG]
    #44
  5. laramie LC4

    laramie LC4 flying something...

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    you can usually find the jets for these carbs at Kawasuzuki dealers or Harley shops. both of them use the mikuni carb for several models. you may try one of these places before ordering threw the mail.

    laramie :beer
    #45
  6. trent

    trent rambler

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    Thanks for your awesome, very informative post Laramie. You've schooled a new 640e owner with bogging issues. I look forward to getting them sorted with your imparted knowledge. :wave

    :super
    #46
  7. laramie LC4

    laramie LC4 flying something...

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    :thumbup :thumbup :thumbup :thumbup :thumbup :thumbup :thumbup :thumbup :thumbup :thumbup

    laramie :beer
    #47
  8. tedmarshall

    tedmarshall Been here awhile

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    From Ted Marshall. I rebuilt the BST on my 2002 LC4 640e. It sat for a few weeks. But today I got it back together. Fresh high-test and it fired right up. :D Ran great. This is only the 2d time I've re-built a bike carb (1998 Buell S3T was gh 1st). A minor victory for me thanks to you!:clap

    Ted
    Wilmette, IL.
    #48
  9. waserman

    waserman Adventurer

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    Hello all I'm new to this forum,as I am to my 2000 Lc4 640e.I just bought this bike last week and am presently sorting out jetting and general bike set up issues.I live in the North East USA and have been riding/racing forever.The bike started out life in Oregon,moved to Wisconsin and finally to the East coast in Pa.The guy I bought it from never wrenched on it,always took it to the dealers,mileage 2300,condition exceptional,pretty much stock,if not all.The question I have is the KTM part #58406003200 airbox cover does it come with a new gasket to go between the airbox and new cover,or do I need to buy another #58406090100 gasket for the filter box cover,and cut trim to fit the new part?I'll be back later I'm off to do some plug readings after some runs to see if I"m getting close,also the snorkel was removed prior to me getting the bike.I just put a 150 main in,it was so lean the plug should have been blistered.:clap I have to say that this is one of the best information forumns I have been on to date.Thanks in advance Waserman
    #49
  10. ChrisC

    ChrisC Amal sex?

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    Take off the left side cover. Pull the plastic/foam liner out and toss it over your left shoulder. Install the stainless/screen "racing side cover" where the plastic/foam part was. Reinstall the sidecover. No gaskets needed... :deal
    #50
  11. NordieBoy

    NordieBoy Armature speller

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    And remember thats "left shoulder".

    Don't get it wrong or we'll have to hurt you.
    #51
  12. laramie LC4

    laramie LC4 flying something...

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    replace item #4 and #14 (#4 is the foam stuck to #14) and replace them with the new racing airbox cover.

    [​IMG]

    laters,

    laramie :beer
    #52
  13. waserman

    waserman Adventurer

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    :1drink thanks for the info guys,I'm still sorting out the jetting before I do that mod.I'm already up to 157.5 and still seem on the lean side although throttle response is a lot better.I just shimed the needle because I was out of clip adjustment,radio shack has a washer kit that I've used before that has just the right size washer for shimming cv needles.I already tore the carb apart and cleaned everything and set the float height,as per the post.Great information I didn't drill my slide out to .125 I went to .110,I have to wonder if this stinking gas we have out here at least 10% ethanol isn't part of the jetting issue,plus I believe we also oxygenate our fuel here too.I' started at 142.5 and I'm getting ready to buy into the 160s now,we'll see how this 157.5 goes.I'll let you know.
    #53
  14. trent

    trent rambler

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    :bow thanks again. I got my bogging solved so far. I did the mods, set float, pilot jet, and main jet. Then I modded my second airbox cover. Went on a little test street run with a couple of minutes offroad with a 8 foot steep climb. So far so good. :D
    #54
  15. ChrisC

    ChrisC Amal sex?

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    Isn't that what I said? :kat
    #55
  16. stephano

    stephano Long timer

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    I just recently did exactly what your doing with the same bike. I live at about 500' and found the 155 main, 47.5 idle jet, stock air jet, needle clip 4th from the top, slide drilled to .125, air/fuel screw 2 turns out, no snorkel, KTM side air box cover.....runs awesome.

    All bikes are different but this worked for me. When you look for other jetting info, just make sure you note the bikes year. The high flow heads run richer.
    #56
  17. laramie LC4

    laramie LC4 flying something...

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    yes, but some people need the picture......:flip

    :lol3

    laters,

    laramie :beer
    #57
  18. pitbull doug

    pitbull doug Been here awhile

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    Laramie props on the BST bible thread,excellent! Nice you took the time and beer of course to start this thread,great detail as well.Just been lurking on ADV rider lately and came accross the thread,anytime your down in So Cal desert area, man I owe you a beer or two thanks again PBD :freaky
    #58
  19. Kemosabe

    Kemosabe Perpetual Adverturer

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    If you are trying to open up your 640. And you still have the stock exhaust.
    The Supertrapp exhaust is tunable. My only had 6 disks in it. I added ten more. Though I bet even adding 6 discs will make a huge difference.
    #59
  20. stephano

    stephano Long timer

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    Even though its "tuneable"...I understand that the amount of restriction before the disc's is not far from the the stock number of disc's, so adding a whole bunch wont do anything.
    #60