Drz250 Thread

Discussion in 'Thumpers' started by tdrrally, Jul 24, 2008.

  1. 1zero

    1zero Been here awhile

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    - Pass :rofl
  2. xsamp86

    xsamp86 n00b

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    Hampshire, UK
    Sorry to drag up an old post but I am looking at fitting a replacement to my old 98 SJ45A DR250XC. Could you possibly post a pic of the exhaust from the other side as Im really struggling to find anywhere who will sell me a bush. What is yours made from? Is it a standard graphite item or did you get it machined from soft metal?

    Finally, anyone know if there are any differences other than inl;et diameter between an 06 and an 08 spec RMZ250 exhaust as the 06 ones are really hard to find at reasonable prices.

    Many thanks :D
  3. 1zero

    1zero Been here awhile

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    Hopefully these photos will clarify a few questions,
    The bush I had made by a friend with a lathe or find something slightly larger that can easily be machined down/up to the required size, you could even use S/S or brass.
    06 and 08 RMZ250 tailpipes look very similar, use google images and look at hi-res images of both bikes and although they went from a steel frame to alloy frame the tailpipes look very similar dimensionally.
    The tailpipes shouldn't be too hard to find secondhand as these owners love to upgrade to 'performance' pipes :rofl
    Good luck, any other ? fire away, cheers.


    [​IMG]

    [​IMG]
  4. 1zero

    1zero Been here awhile

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  5. AlexD92

    AlexD92 DR-Z 250

    Joined:
    May 4, 2010
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    78
    Location:
    Québec, Canada
    New seat for my old girl.

    Before
    [​IMG]
    After
    [​IMG]
  6. mendydrz

    mendydrz Been here awhile

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    Well as my little beast has taken me the best part of 2 years to put back together ( thanks multiple deployments) the motor is together, I just want to get a workshop to double check the timing so it doesn't implode on start up.

    I trial fitted the drz400 rear shock.

    It will fit with some slight mod to the shock and a little to the bike. The shock mod being the lower mounting piece needs to be shaved a couple of mil easy side to fit the 250 knuckle, and to the bike the right hand side plastic cover metal lug that hold it in place need a gentle tapping with a hammer to allow the shock resivour to fit. I may also grind it back about 10mm so it has no chance to touching.
    Also fitted my hand guards and windshield and GPS mount.
    I also got brackets made to fit the XR400 17 liter tank so that will be fitted soon

    Still to come is a tm33 pumper carb, new exhaust and some soft panniers.
    Once it all setup I will run it in then be gifting it the the wife
    I've stopped progress this week as I bought a ktm625 so I've been having fun on that instead!

    Rear shock Upside down but needs shaving to fit

    [​IMG][/IMG]

    GPS mounted with a ram 1inch ball mount with gizzmovest. Still lets me se the speedo

    [​IMG][/IMG]

    Front of the bike with screens for bikes windshield and hand guards

    [​IMG][/IMG]
  7. JamesK

    JamesK Been here awhile

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    Nice work MendyDRZ, looks like it will be a fun little bike for the wife.

    Could you pls let me know where you scored the DRZ400 shock and the TM33 Pumper Carb?
  8. AlexD92

    AlexD92 DR-Z 250

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    May 4, 2010
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    78
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    Québec, Canada
    Keep us posted on the drz400 rear shock mod. I`m very interested in hearing more.
  9. mendydrz

    mendydrz Been here awhile

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    I got the shock for free, brand new!

    Lets just say it fell of the back of a truck!
  10. JamesK

    JamesK Been here awhile

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    Can anyone offer some advice on what rear sprocket I would need to give my Djebel 250 more lower pulling power to get up steep hills?

    I've read on Thumper Talk that the DRZ400 rear sprocket is a direct swap for the DRZ250, so that should open up the available parts to choose from.
  11. JamesK

    JamesK Been here awhile

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    This kind of hills:

    [​IMG]

    [​IMG]
  12. mountainduro

    mountainduro hardened rider

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  13. JamesK

    JamesK Been here awhile

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  14. mountainduro

    mountainduro hardened rider

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    Hi guys sorry for my absence,nice to see new machines,more good info.
    BTW I got a new for me DRZ 250 almost new,I will be posting pictures later on.
  15. 1zero

    1zero Been here awhile

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    Depending if you ride on the road or not, go 2x teeth more on the rear sprocket for off road type of riding - this is very good for off roading, but it may make the engine very busy at 100kph or so tho.
    Leave the front sprocket standard, cheers.
  16. mendydrz

    mendydrz Been here awhile

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    My best advice would be to leave the rear sprocket as it is.
    Best off going gown a tooth in the front easier to change as its held in by a circlip. Maybe even 2 teeth and flat stick it in second.
    When I put a 12 tooth on mine it's top speed was about 85kmph but it climbed anything in second and third
    That way you can change it easily before taking on the hills and switch it back over for the trip home
  17. tdrrally

    tdrrally Long timer

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    i run a 13/46 on the road its ok off road, some times a 15/46 but its to tall for any off road use

    i run a 13/49 off road its very good but 12/49 sounds like its worth a try:evil
  18. privateer2010

    privateer2010 Adventurer

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    Here is a good little calculator to help you decide. You enter the number of teeth on the front and rear currently running and then the number for what you are thinking about changing to. It calculates the % of change you can expect to gain or loose. I have been changing out just the front sprocket when tackling steep off road riding, I go down one tooth and leave the rear alone. It is easier and you get an instant 7% or so of gain in low end grunt. Plus if you need to you can still run on the road. Here is the site:

    http://sprocketcalculator.com/
  19. tdrrally

    tdrrally Long timer

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    3:1 is near stock gearing for a stock d/s drz/djebel 250
  20. mountainduro

    mountainduro hardened rider

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    I found this useful information at TT:


    According to the official parts fiche, the
    DR-Z250 has a 13 tooth front sprocket. It
    has always had that front sprocket.
    To figure out how changes in tooth count
    will affect the bike, take the ratio of the
    front tooth count over the rear tooth
    count. Thus, stock is
    13/49 = 0.2653
    If you change to a 51 tooth rear, the new
    ratio is
    13/51 = 0.2549
    The percentage change in mechanical
    advantage is
    (0.2653 - 0.2549) / 0.2653 x 100 = 3.9%
    If, instead, you change the front from a
    13 to a 12, the new ratio would be
    12/49 = 0.2449
    The percentage change in mechanical
    advantage is
    (0.2653 - 0.2449) / 0.2653 x 100 = 7.7%
    Because there are fewer teeth in the
    front, the change of one tooth is a bigger
    percentage change. However, 12 teeth is
    a fairly small sprocket and requires the
    chain to bend more quickly. That is why,
    when I upgraded my DR-Z250, I added 2
    teeth in the back, rather than dropping
    one in the front. I also changed the
    chain, but the stock chain should be able
    to fit with a 2 tooth increase in the rear.
    Going to a 53 in the rear will get you a
    7.5% mechanical advantage. However,
    the stock chain may no longer fit. Is
    7.5% enough to loft your front wheel? I
    don't know, but it is a step in the right
    direction.


    And...

    Front Rear Rpm Kph Mph
    14 41 4500 100 62
    14 41 4950 110 68
    14 41 7800 173 108
    14 43 4700 100 62
    14 43 5200 110 68
    14 43 7800 165 103
    15 46 4700 100 62
    15 46 5200 110 69
    15 46 7800 166 103