Another I want to build a MX based adv bike

Discussion in 'Some Assembly Required' started by k555, Jan 23, 2018.

  1. 79thunder

    79thunder Been here awhile

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    What year is your WR Chassis? (edit-nevermind I see it's an '05)
    I don't know if the tank from an 2008-2018 WR would fit.
    But it would be easiest.
    Either factory tank or a larger aftermarket tank designed for an '08 and up WR. (Safari, IMS, Acerbis, etc.)
    That way you could run a stock Yamaha in tank pump.
    #41
  2. k555

    k555 Adventurer

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    Nov 21, 2016
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    I’m thinking of changing directions to a 2008 or newer just to clear the tank hurdle. Anyone know it the r3 will fit without cutting the frame?
    #42
  3. 79thunder

    79thunder Been here awhile

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    Lots of options and work arounds.
    2008 and up WR gets you a tank with an in-tank EFI fuel pump.
    Aluminum frame may be more difficult to modify/weld depending on your fab skills.

    Older steel WR frame is easier to weld/modify.
    I don't think it would be to difficult to install a newer WR fuel tank and pump on a steel frame WR.

    Or..
    An external frame-mounted electric EFI pump.
    You'd have some plumbing to do, but entirely doable.
    I prefer in-tank pumps, but I know some prefer the serviceability of external pumps.

    something like this:
    https://www.aliexpress.com/item/Fue...it-UAV-Motorcycle-trail-bike/32789649530.html

    fuel pump (640x520).jpg
    #43
  4. k555

    k555 Adventurer

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    Here is the finished 2016 with all the 2017 equipment ( engine, dash, harness etc). I will use the 2016 stuff for the build. Progress soon!

    Attached Files:

    #44
  5. MotoPolo

    MotoPolo So many places, so little time

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    Did you decide to go with an Al frame WR?
    #45
  6. k555

    k555 Adventurer

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    Steel.... for now
    #46
  7. k555

    k555 Adventurer

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    Finally got the frame and motor up on the workbench. Looks like I’m gonna loose about 3 inches of ground clearance. Kinda bummed but think I will continue.
    #47
  8. k555

    k555 Adventurer

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    Still should have about a foot of ground clearance. That’s acceptable! If I can keep the specs better than the crf and wr250r I will be happy. Still totally possible to come in 275lbs or less with 12in of ground clearance and suspension travel.
    #48
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  9. 79thunder

    79thunder Been here awhile

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    If it helps, you can do an air injectetion block off plate to maybe get the engine ever so slightly higher in the frame.
    It would not have made a difference on my chassis, but it might on yours. (can't tell, we'll need pictures soon)

    Graves-yamaha-yzf-r3-smog-block-off-plate__75610_1468868549.jpg
    #49
  10. k555

    k555 Adventurer

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    I thought the counter shaft had to be pretty much level with the swing arm bolt. Looks like I can cheat it high quite a bit? That and the biggest counter shaft sprocket I can fit should get me up close to where I need to be.

    Attached Files:

    #50
  11. MotoPolo

    MotoPolo So many places, so little time

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    I would try to keep sprocket as close to doaner frame sprocket location as possible - you may be able to install a shorter sump to gain ground clearance
    #51
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  12. Salsa

    Salsa Long timer

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    MotoPolo is right!!!

    My only other requirement is that the travel is centered (not level) on the straight line between the sprockets and the swing arm pivot. You can cheat if you use an idler sprocket, but that complicates things.

    Don
    #52
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  13. brownvv

    brownvv Been here awhile

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    Any pictures of the frame and motor yet? I am very curious of how well this fits in there
    #53
  14. shinyribs

    shinyribs doesn't care

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    You just about cut the power in half. They are roughly 35hp at the tire.
    #54
  15. Samtech79

    Samtech79 Two wheeled lunatic

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    Oh no they aint.... wishful thinking bud.
    #55
  16. k555

    k555 Adventurer

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    Progress has been slow. Just relocated last summer and have been renting, in the process of buying a house. I did some hacking with the grinder. No frame jig, think she’ll be straight?

    Attached Files:

    #56
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  17. brownvv

    brownvv Been here awhile

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    That looks doable. Does the tank clear the engine. What year and model of frame is it?
    #57
  18. k555

    k555 Adventurer

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    I don’t have a tank or seat yet. Looks like plenty of room. The frame is an 03 wr250f street titled of course! If I get it all together and can’t find a tank solution I’ll go custom, of course I’ll try to avoid that $$$$
    #58
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  19. brownvv

    brownvv Been here awhile

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    What is the distance from the center of your swingarm pivot to the bottom of the frame. How much ground clearance are you going to lose? I am looking at putting one in a newer ktm with linkageless suspension but I am afraid the swingarm pivot is too low for that engine. I saw the engine measurements, just looks different in your frame
    #59
  20. k555

    k555 Adventurer

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    Off the top of my head I think just over 2”. I did cheat the counter shaft a bit higher than the stock wr. I am going to look into flattening the pan as the cbr500 guys do on the crf500l builds. The emissions port on the valve cover looks like it can be removed completely and install pipe plugs in the holes. I will probably just use a block off plate as the head room is plenty in the wr now that I butchered the frame.
    #60