DR 650 Carburator calibration

Discussion in 'Thumpers' started by Francisco Gomez, Feb 15, 2013.

  1. Francisco Gomez

    Francisco Gomez Adventurer

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    hello forum how are you, we hope everithings fine
    I have a DR 650 2012, bought from dealer, but when I used the bike it has a problem with the carburator, when I cheked the Spark Plug it was with a black color, two of them, but when I try to adjust the carburator, I can not find any screw to control or modify it.
    Please could you could explained how to control or adjust the carburator, or could you recomend me a book to control any mechab nical parts of the bike?=
    Your support and assistance will be highly apreciated
    #1
  2. nzrian

    nzrian Been here awhile

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  3. kellymac530

    kellymac530 motorcycle addict

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    Alot of newer street bike carbs have a sealed cap over the air/fuel mixture screw. It is possible to drill out the cap and readjust the mixture. They cap this for smog reasons usually. I am not positive about your specific models carb, but it is a possibility.

    The suggestion to ask over in "Thumpers" is good because more people there will have info on the DR.
    #3
  4. CoyoteCowboy

    CoyoteCowboy Easily Distracted

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    Open the choke!!! :lol3
    #4
  5. Kommando

    Kommando Long timer

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    If your sparkplugs are black, it's usually running rich. Make sure that the choke/enrichener is shutting off when you move the handlebar lever. You could also be at a high enough altitude that the factory carb adjustments are too rich. The idle mixture, the needle clip setting, and the main jet may be too rich for your location.

    An inquiry to the email address for www.procycle.us could get you set up with the parts you need to make carb adjustments easy.

    Also...Do a google search for the "BST bible". It tells you how to adjust anything on the DR650's BST40 carb.
    #5
  6. eakins

    eakins Butler Maps

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    i'm sure Motolab will chime in here soon enough with some good things to check.
    there is also the BST bible thread here in thumpers. read that so you understand what you own.

    1st of all there is no "knob" to control the carb.
    first make sure your choke is not stuck on.
    after that you can update the pilot jet screw with one with a hand knob on it, but the pilot jet controls are very narrow range of the carb operation.
    after that there are jet and carb changes you can make to optimize it.
    maybe you should start with pulling the carb and doing a pine sol soak to clean it.

    in the end it sounds like a rich running carb and you should have a warranty. have the dealer look at it.
    #6
  7. Foot dragger

    Foot dragger singletracker

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    Ive never changed anything on my DR650 carb,its good from sea level to at least 9500' elevation,probably higher.
    Id take it to a mechanic or the dealer,something is wrong. If your at 13000' elevation then the dealer must have some idea what to do to it.
    #7
  8. shu

    shu ...

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    Look on this thread for a complete teardown of the BST40 carb from a KTM- slightly different than the DR650 version but close enough to get the idea.

    http://www.advrider.com/forums/showthread.php?t=347184

    Post your questions at the end of that thread- you'll get lots of help. Be sure you explain exactly what is wrong with the way the bike is working. Is it hard to start? Runs rough or misses at half throttle? Surges?

    As foot dragger said, my stock carb runs fine from sea level to 12,000 feet. Above 12,000 it still runs ok but the bike is way down on power.


    Good luck..................shu
    #8
  9. eakins

    eakins Butler Maps

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    good pics.
    indeed that will get you to an adjustable pilot jet screw or just adjust the factory screw from there (out), but he's saying he has problems with the carb.
    for the most part the factory setting will still work and the bike will run. this is a new bike so it might be more than this & this screw only affects a narrow narrow range of carb operation anyway.

    he's got black plugs and that says too rich. the pilot jet is lean from the factory so that is not the issue.
    it's an 2012 so he should have a warranty.

    this might be yet another thread where the OP never shows back up to check on responses.
    note he has not checked back in after a week,
    #9