Honda 919 Dual Sport Beast

Discussion in 'Some Assembly Required' started by Byrdman, Mar 17, 2009.

  1. Byrdman

    Byrdman Fat guy on a little bike!

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    Too funny, that's where this project started. Here's my original design study.

    [​IMG]
    #21
  2. mtothef

    mtothef Been here awhile

    Joined:
    Dec 23, 2006
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    santa cruz, ca...
    careful with the swingarm pivot relocation - the further the pivot is from the countershaft sprocket, the greater chain tension differential you'll have as the rear wheel moves through its arc. basically super slack at top out, to super tight at the point where the countershaft, pivot and rear axle are all in a line, then looser again at bottom out. the more travel you have, the bigger an issue this becomes. that's part of the reason why newish mx bikes have their countershaft sprockets almost touching the swingarm pivots, and why old-ish long travel mx bikes have all kinds of chain tensioners and old timers have all kinds of "that time my chain went through my engine case..." horror stories. otherwise, kickass!
    #22
  3. Byrdman

    Byrdman Fat guy on a little bike!

    Joined:
    Sep 27, 2006
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    That's great info. I'm going to re-study this issue. It may be smarter to extend the swingarm 4".

    Off to play with the CAD system.
    #23
  4. BeeDub

    BeeDub Havagoowan

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    Awesome looking build! You must be one tall SOB. I am building a Duc Monster, well, slowly. Anyway, I'm thinking I'll only extend the swingarm about 2", though I don't know anything about how to CAD it up. I'm also putting on a taller shock and an adjustable height tie rod. On top of that, I'll go with larger sprockets front and rear to help the angle clear the swingarm.

    Have you seen Old Dog's Ducati build? He went about 4" on the swingarm and he's pretty tall too, and he still thinks it was way too much from what I gather. Not sure if it was the height or the length he had a problem with, but you might want to give him a shout and find out.

    By the way, one other tip for weight savings...check these batteries out:

    Here

    Guys are using them on the Ducati forums with no issues. They are also suppose to last longer, and put out more power than a lead battery.
    #24
  5. Stretch67

    Stretch67 Mad Scientist

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    Yep, that's about it, but with a high fender and TKC's. I photoshopped big XR forks, front fender, and wheels onto a 750 NH, and I like the look. The 919 is a much better bike than the CB750, but I'm going for reliability and simplicity of the basic platform.

    The '91-'03 Nighthawks are reputed to be one of the most reliable (albeit maybe a tad boring and long-in-the-tooth) bikes made... no fuel pump, no injectors, no radiator, no fan, no computer, no valve adjustments. Just keep gas and oil in 'er and enjoy.

    In spite of loving my 955 Tiger, I'm quite the luddite when it comes to bikes... I prefer air-cooling, gravity fuel feed, carbs (good ones), external alternators, and no computers or ECU's.

    I'll be watching your build quite closely. Best of luck.
    #25
  6. Byrdman

    Byrdman Fat guy on a little bike!

    Joined:
    Sep 27, 2006
    Oddometer:
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    Streamwood, Illinois
    I had a donor 1992 NH750 and even started the dual sport build with it. The ONLY reason I went with the 919, I friggin hate carbs! I have rebuilt enough carbs to last a life time!

    It is a bulletproof bike though. Like you said, fuel it and ride.
    #26
  7. joey95

    joey95 n00b

    Joined:
    Sep 14, 2009
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    8
    Great project cant wait till its done
    #27
  8. Byrdman

    Byrdman Fat guy on a little bike!

    Joined:
    Sep 27, 2006
    Oddometer:
    355
    Location:
    Streamwood, Illinois
    Okay, I finally have the 919 frame chopped and re-welded together. It was a pretty big leap of faith cutting up two perfectly good 919 frames!

    The original problem:
    [​IMG]


    I figured that by dropping the swingarm pivot by 1.25", the line between the rear axle and the countershaft would be just about perfect under static sag. So, apart came the frames!

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    I'm making good progress now. I need to get some additional pictures of the completed frame. Next step, I'm having the swingarm extended 3". That will give me a nice, long wheelbase for my extra large build! :eek1
    #28
  9. c.vestal

    c.vestal Rally On

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    nice!
    #29
  10. larryboy

    larryboy Chopper Rider

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    Looking good, Byrdman!!! I'm just about to jump back into the Bandit project as the weather has finally cooled down around here.
    #30
  11. lukasteam

    lukasteam Life is beautiful !!!

    Joined:
    Apr 6, 2009
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    Naperville,IL
    WOW!!! Cant wait to see the finished product.This is gonna be an ultimate dual sport monster!!!
    #31
  12. Byrdman

    Byrdman Fat guy on a little bike!

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    Streamwood, Illinois
    At this pace, this thread might go on forever!

    I am finally back in gear and have made some progress.

    [​IMG]

    KTM Adventure forks and wheels are on. I'm working on the remote oil filter now and will be extending the swingarm in the next few weeks. Then I have to bend some 1/25" square tube into a lower frame cradle to add some strength.

    It's amazing how damn expensive KTM Adventure parts are and how hard they are to source! It does feel good to be back moving forward again though!
    #32
  13. Cap'n Crunch

    Cap'n Crunch Smelly Adventurer

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    I'm speechless. subscribed!!!!!!!!!!!!!!!!!!:D
    #33
  14. Dorzok

    Dorzok Long timer

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    SoCal
    what's them curved pieces under the motor running front to back. looks cool, ought to incorporate it into some sort of crash bar/skid plate.
    #34
  15. Dirty White Boy

    Dirty White Boy Don't touch the trim

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    Looks like oil lines to me. :dunno
    #35
  16. locorider

    locorider Loco, pero no estúpido!

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    Looking good!:lurk

    #36
  17. clapped_r6

    clapped_r6 The Spoad Warrior

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    badass :bow
    #37
  18. OUTsane

    OUTsane rerutnevdA

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    NY/NJ
    Wow, that's awesome!
    #38
  19. wachs

    wachs just passin' through

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    Tumalo, Oregon
    outrageously cool project - :clap
    #39
  20. Jiminy Cricket

    Jiminy Cricket Been here awhile

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    You must drink alot.
    #40