XR 650R: Ultimate Jetting Instruction for Dummies

Discussion in 'Thumpers' started by babuja, Jul 15, 2012.

  1. babuja

    babuja Been here awhile

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    Hi,

    after much reading i would like to start a thread for dummies and noobies like me for proper jetting the XR 650 R.

    Mode: XR 650R 07 DK or U model (not sure)
    Exhaust: Pro-Circuit complete exhaust
    Inlet: Xronly Side Panel cutout

    Altitude: Sea level < 1000feet
    Temperature: 75-95ºF
    Humidity: 70-90% [Angola]

    Pilot: 68s
    Need: B53E

    Where should I start with?

    Mainjet Size:
    Clip Postion:
    #1
  2. babuja

    babuja Been here awhile

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    According to this: http://www.xr650r.us/jetting/ maybe start with:

    Mainjet Size: 175
    Clip Postion: 3rd


    *** XR650R Uncorked /stock header with HRC tip / B53E Comp Needle***

    Use a main jet one size smaller when using a drilled stock tip instead of the HRC tip
    Use a main jet one to two sizes larger when your side panel is cutout
    If the stock needle is used, then ad +1 to the clip position listed below
    Use a main jet one size larger with a high flow aftermarket exhaust canister
    Use a main jet two sizes larger when using a larger diameter aftermarket header & exhaust canister
    #2
  3. babuja

    babuja Been here awhile

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    anyone?
    #3
  4. oldxr

    oldxr Long timer

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    Try 178 main -b53e needle 3rd of 4th groove from top 68s pilot
    #4
  5. babuja

    babuja Been here awhile

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    Tnks oldxr fro your feedback.

    Anyone with same settings?

    Mode: XR 650R 07 DK or U model (not sure)
    Exhaust: Pro-Circuit complete exhaust
    Inlet: Xronly Side Panel cutout

    Altitude: Sea level < 1000feet
    Temperature: 75-95ºF
    Humidity: 70-90% [Angola]

    Pilot: 68s
    Need: B53E
    #5
  6. babuja

    babuja Been here awhile

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    From all the feedback and what I read this seen to be more or lens consensus:


    Pilot: 68s
    Need: B53E
    Mainjet Size: 175
    Clip Position: 3rd position counted down from top of needle (and adjusted if needed).

    Fuel Mixture: 2 1/2 turns out

    Float Bowl: Don't know if any change is needed here?!

    I'll prefer to jett in the richer side and the adjust.

    I'll give some feedback about this ;)
    #6
  7. babuja

    babuja Been here awhile

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    Couldn´t get my hands on a 178 and used a 175 on the 4th position down from top.

    Bike running stronger, wheely comes out every time...sound perfect but need further test drive.

    Just noticed some increment on oil temperature but not sure if results from higher air temperature (sommer is coming up), or any other reason.
    #7
  8. babuja

    babuja Been here awhile

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    In low rpm bike not so strong...not sure what to do.

    Try do adjust air mix or move needle?

    Guys, need some advice how to proceed.
    #8
  9. larryboy

    larryboy Chopper Rider

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    Drop to a 168 main, you knew it was rich, now it's time to tune like you mentioned.
    #9
  10. babuja

    babuja Been here awhile

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    Hy larryboy, tnks for your feedback.

    I'll do some more tests to evaluate low to mid throttle performance, midrange and three-quarters to full throtle performance, and take some readings.

    I'll remove spark plug and clear it to see any changes in spark plug to help reading engine lean/rich condition and be right back with some more data.
    #10
  11. mung

    mung Been here awhile

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    Have about the same motor and pipe setup but with Hot Cam 2. Fuel screw 1.5,68s,HRC needle in 2nd clip from top,175 main.Works very good at my 6000 plus elevation.For Baja I use a 180 main.Clean,economical midrange and plenty of fuel for hard pulls.Lots of miles with this combo and it works very well for me. PS- modern gas does not give a very accurate plug color.
    #11
  12. babuja

    babuja Been here awhile

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    Tnks mung...next weekend I'll do some tests with this setup and report all infos :deal
    #12
  13. babuja

    babuja Been here awhile

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    [​IMG]

    Need some help with Gary table.

    1) What is exactly the "high flow aftermarket exhaust canister"? Is my T4 Pro circuit complet exhaus in this category?

    2) What is exacty the "larger diameter aftermarket header & exhaust canister". Is my T4 Pro circuit complet exhaust in this category?

    Tnks guys.
    #13
  14. babuja

    babuja Been here awhile

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    Need some help with table.

    Regarding Main Jet, Gary says: " Use a Main Jet one to two size larger when your side panel is cutout".

    In using XRonly side panel cut out.

    In your experience, where did you find best results with main jet: 1 or 2 size larger? Tnks
    #14
  15. babuja

    babuja Been here awhile

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    Adapted from Gary table to my Angolan XR 650R 07:

    [​IMG]
    #15
  16. babuja

    babuja Been here awhile

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    When at relanti if I give a strong aceleration the motor hesitates and some time dies...

    If I gradualy acelerate a bit and then give a strong acceleration I have no problem.

    What cold be the problem? Tnks guys
    #16
  17. sintax

    sintax Been here awhile

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    sounds like you might be a little too rich.

    You might try dropping the needle down one spot, see what effect that has on it. Since the need needle plays a big role in the whole mid range power, it may affect it poorly. If that happens move the needle back. And try dropping down one size main.

    You and I have close to the same elevation and temp, but you have much higher humidity. When I get home tonight I can see if i can find my settings for when I jetted my stock carb. I have since moved to the TM40. I completed jetting it yesterday, it is amazing!
    #17
  18. babuja

    babuja Been here awhile

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    Thanks sintax, I appreciate that...tnks man :ear
    #18
  19. babuja

    babuja Been here awhile

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    [​IMG]

    [​IMG]
    #19
  20. sintax

    sintax Been here awhile

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    very sexy man. Love the USD forks!
    #20