Bike inspiration/questions on this one:

Discussion in 'Motorized Bicycle General Discussion' started by gomotomoto, Mar 2, 2012.

  1. gomotomoto

    gomotomoto New Member

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    This bike has caught my eye, going to use it for inspiration for my next build. I found the bike on bikermetric.com, run by a creative and funny madman named Trent. He didn't know much about this bike -- so i'd like to know how this frame came about to "be". Look like the guy cut up the tail of a bicycle and then fabricated the rest of the front end and frame. Forks are a mystery too.

    How would you approach a similar frame build?
     

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  2. rustycase

    rustycase Gutter Rider

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    great looking bike with clean lines!

    I might try mounting a BB forward of the engine, 'townie' style, to build it as a motorized bicycle.

    Tnx for posting the pic!
    rc
     
  3. gomotomoto

    gomotomoto New Member

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    Thanks Rustycase, can you help me with the nomenclature? What's BB and MAB?

    Nice bike, right?
     
  4. biknut

    biknut Active Member

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    A BB is a Bottom bracket. That's were the peddle crank goes. motorized bicycle is motor assisted bicycle. We just call them motor bicycles.
     
  5. culvercityclassic

    culvercityclassic Well-Known Member

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    Thats my style...very nice bike
     
  6. rustycase

    rustycase Gutter Rider

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    ...the more I look at it, the more I like it!

    It really is quite an artistic piece of work.
    ...not really meant to be run much, but kinda techie...

    it's got the rear disk, for simplicity, where a front disk would be much more effective.
    The eccentric axle adjuster is very nice. Difficult to fab.
    The 10 ounce fuel tank and seat are only meant for a lap or two, and the minimal trail on the front forks have got to be quick turning. Lack of front suspension would lead me to believe it wasn't meant for any type of street use.
    Of course the megaphone was only installed for it's good looks, and to make friends, far and wide!!!
    Near as I can tell, the entire front section of the bike, the top backbone, neck, and downtube, are all cast together as one piece. A difficult and awkward casting to make!

    I went over to bikermetric but could not find any other pics of it. I'd like to see more!

    There was a lot of chopped yamaha 650 twin stuff over there.
    They were, and probably still are good bikes.
    I don't quite understand the 're-phasing' they are doing with them, and must read more about it.

    Best
    rc
     
  7. wheelbender6

    wheelbender6 Active Member

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    Girvin fork looks cool. They are getting harder to find these days.
     
  8. Ibedayank

    Ibedayank New Member

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    frame is 2 pieces the back called a hardtail is bolted to the front half of the frame
    seat looks like it bolted in the front with a big spring on the rear... not enough clearance for hitting bumps without tire rub. the front forks are type of triple trees with the fork tubes installed backwards. looks like plumbing strap was used to make the rear caliper mount should be solid metal. fork tubes are bolted on not in a set of triple trees if a bolt breaks you are CRASHED...
     
    #8 Ibedayank, Mar 3, 2012
    Last edited: Mar 3, 2012
  9. mapbike

    mapbike Active Member

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    The rephasing of the XS 650 Yamahas is to smooth them out, I don't know if you are familiar with those engines or not, but they are very torquey but they aren't smooth running at all, the engine design is paterned after the old triumphs in that both pistons travel up to tdc and fire at the same time, they don't alternater to where one cylinder helps the other, they both hit at the same time, this makes them really low end powerful but also makes them idle so rough that if the bike is on the center stand and you rev it up the entire bike will vibrate to the point it will walk backwrads on the stand, I had one of these bikes when I was 15 and was around loads of them since my uncle owned a Yamaha dealership from the 60's through the early 90's.

    They rephase the cranks 277 degrees and grind custom cams and build custom ignitions for the rephased engines, they run good, sound good, and are much smoother from what I've seen.

    Best I can tell the fella that started it all is Hugh's HandBuilt in Asheville NC here is a link that will hook you up on the info. about these engines.

    http://www.youtube.com/watch?v=cOITE_aSkXw

    http://www.youtube.com/watch?v=s-j9q6K_828&feature=related

    Hope you don't mind me posting this up for ya rustycase

    Map


     
    #9 mapbike, Mar 3, 2012
    Last edited: Mar 3, 2012

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