Call all XR600R!!!

Discussion in 'Thumpers' started by CSMonte, Dec 8, 2008.

  1. kirbi69

    kirbi69 Been here awhile

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  2. LandsVW

    LandsVW Been here awhile

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    My tank looks exactly like your before tank. How'd you get it cleaned up?
  3. beechum1

    beechum1 Dandole Gas al Burro

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    stock springs were different colors but same rates over the years.
  4. beechum1

    beechum1 Dandole Gas al Burro

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    Does the NX2nd gear swap work for the 600 also? I mean, does is close the gap also?
  5. mcma111

    mcma111 Long timer

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    The XR and XRL both have the same 17 tooth second gear. What is different is the main shaft on the XR600 is 13 tooth and the XRL a 12 tooth.
  6. beechum1

    beechum1 Dandole Gas al Burro

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    I'm an idiot. I don't understand what that means. Less top speed? same transmission ratio, just less top speed in each?
  7. MCCOYBOY

    MCCOYBOY Adventurer

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    I bought it in rough shape a little over a week ago. It still needs cosmetic stuff but I'm taking it out tomorrow to test the revalve I'm trying on the shock and forks. It has the thumper racing 660 kit, forks from a crf450x and a few other goodies. Should be a blast when I'm done!
    [​IMG]
  8. elsalvadorklr

    elsalvadorklr southern xr rider

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    niiiiiiiiiiiiiiiiiice!

    also xl600 headers! and wrapped!

    someone knew what they were doing to the bike you have there...nice score:D
  9. elsalvadorklr

    elsalvadorklr southern xr rider

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    well not a lot of action on this thread lately, maybe everyone is doing some christmas riding...lucky punks!

    anywhoo to bump this thread here goes:

    anyone have some mikuni pilot jets hanging around? wanna trade for some stock jets?

    I dont want to give up on my tm38 carb...so if you guys have some pilot jets, maybe a 17.5, 15 and a 12.5 laying around shoot me a pm

    thanks guys:D
  10. mcma111

    mcma111 Long timer

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    You just have to futz with it don't ya.

    Thinking of going over to Marin this afternoon. I could stop at that shop and pick the jets up if you want.

    Mail them in a Christmas card.
  11. elsalvadorklr

    elsalvadorklr southern xr rider

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    well you know me boss...if I can get either of the carbs to start and perform better than right now Ill do it...

    the tm38 is better at not dying instantly if you tipover...it will keep running and since Im a short mother that means I dont have to stand there kicking forever if I do stall it...

    not saying Im a racer but its just annoying:deal

    was just wondering if somebody wants to trade some jets...jajaja keep it on the cheap $$$$

    appreciate it though...
  12. MentalGuru

    MentalGuru Crazy Diamond

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    Sorry to tell have you this... but you have the answer correct. :lol3

    :freaky
  13. beechum1

    beechum1 Dandole Gas al Burro

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    which part?
  14. MentalGuru

    MentalGuru Crazy Diamond

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    All of it. :rofl :rofl :rofl

    :freaky
  15. beechum1

    beechum1 Dandole Gas al Burro

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    :lol3
  16. MentalGuru

    MentalGuru Crazy Diamond

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    Here's a post I made over on tt... Ask any question you have... :1drink


    XL600R

    Primary Reduction 2.188 (70/32)

    1st Gear '83-84 is 13/32 (2.46)

    1st gear '85-87 is 13/31 (2.38)

    '85-'87 XR600R & XL600R

    31/13 2.38
    28/17 1.65
    25/20 1.25
    23/23 1.00
    21/25 0.84

    XR600R gear ratios

    Primary reduction 2.188 (70/32)
    Final reduction 3.429 (48/14)
    1st: 2.385 (31/13)
    2nd 1.647 (28/17)
    3rd 1.250 (25/20)
    4th 1.000 (23/23)
    5th 0.840 (21/25)


    XR650L Gear ratios

    Primary Reduction: 2.029 (69/34)
    Final Reduction: 3.0 (45/15)
    1st: 2.66 (32/12)
    2nd: 1.647 (28/17)
    3rd: 1.250 (25/20)
    4th: 1.00 (23/23)
    5th: 0.840 (21/25)



    NX650 & FMX650 gear ratios
    Primary Reduction: 2.029 (69/34)
    Final Reduction: Varies
    1st 2.66 (32/12)
    2nd 1.75 (28/16)
    3rd 1.25 (25/20)
    4th 1.00 (23/23)
    5th 0.80 (20/25)


    GB500
    31/13 2.38
    28/18 1.55
    24/20 1.20
    23/23 1.00
    21/24 0.875

    XR650L
    Primary Reduction 2.029 (69/34)

    XR600R
    Primary Reduction 2.188 (70/32)

    XR600R
    HRC KIT
    Primary Reduction 2.029(69/34)

    XR 5Tth gear 21/25

    NX 5th gear 20/25

    It sounds like you could play on http://www.gearingcommander.com/ for a while.

    You can change the listed NX650 5th gear tooth count to the Euro spec.



    Here's a copy of 'davek18' reply.


    I used that same chart and elaborated with different primary and final drive ratios back when I was trying to decide what gearing I wanted to run.

    [​IMG]



    [​IMG]
  17. beechum1

    beechum1 Dandole Gas al Burro

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    I have. What does primary reduction mean. Where is that?

    The clutch basket to main shaft?

    And it appears that smaller #'s mean faster.
  18. MentalGuru

    MentalGuru Crazy Diamond

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    Thats right. The primary drive ratio is the gearing between the crankshaft and the transmission input shaft.

    The lower ratio/smaller number equals higher speed and lower engine rpm.

    The gearing link I posted will help show good examples if you try some different bike/gearing combos.

    :freaky
  19. MentalGuru

    MentalGuru Crazy Diamond

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    I will admit my math teacher was right when he told me to pay attention. :lol3

    It's all math... Primary ratio x transmission ratio x final drive = overall ratio. The tire and RPM add a whole bunch of extra math. :deal


    Horsepower is just a math problem too. Torque x RPM divided by 5252 equals horsepower. :rofl


    :freaky
  20. beechum1

    beechum1 Dandole Gas al Burro

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    I was advanced physics and math in highschool. 20 years ago!!!