Bill's Vintage Briggs Motorbike Build

Discussion in 'DIY Home Built Motorized Bicycle (non kit)' started by msrfan, Jun 22, 2015.

  1. msrfan

    msrfan Active Member

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    My friend Bill and his son made this bike from an early frame he modified by looping the bottom, adding truss rods to the fork and beefed up rear wheel supports. He also lengthened the bars and installed a vintage headlamp. Our friend Mike made the beautiful tank and I supplied the rear Musselman hub and front skipper sprocket.
    The engine is a model FH Briggs and Stratton that's missing a lot of parts. It has one external pushrod for the exhaust valve and the intake is atmospheric. He's working on adapting a later flywheel to replace the original broken pot metal unit. It will use an external magnetron pointless coil on a homemade bracket, maybe with adjustable timing. After soaking the kick start gear to free it up, a kicker and segment gear will need to be fabbed to match and then a pivot shaft mounted in the correct position. The governor is located inside the cover on the left. I don't know yet what he plans for it. We're searching for a suitable carburetor that will be adapted and he'll use a belt drive to a rear pulley mounted to the wheel, probably a nice flat 24'' bicycle rim.
    Bill also has a lawnmower clutch we're going to check to see if tit has possibilities.
    Some kind of jack shaft may also be added.


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  2. msrfan

    msrfan Active Member

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    This is the clutch we're thinking about and some more pics of the bike.


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  3. Ludwig II

    Ludwig II Active Member

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    Have you seen the video of the Buddfab 1905ish motorcycle?
     
  4. curtisfox

    curtisfox Active Member

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    OK Got to watch this KOOOOOL build,love the old briggs builds. .........Curt
     
  5. Ludwig II

    Ludwig II Active Member

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  6. BOYGOFAST

    BOYGOFAST New Member

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    Amazing ..
     
  7. Intrepid Wheelwoman

    Intrepid Wheelwoman New Member

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    Oh my. I love this bike :D

    Old engines rule!
     
  8. MEASURE TWICE

    MEASURE TWICE Active Member

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    I'll hope to have some time to do a bike with a 5S or 6S Briggs I have wanting to get going. I'll be watching how your work continues!
     
  9. msrfan

    msrfan Active Member

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    Bill's been working on the mount for his vintage Briggs. He's got it all cut out and mocked up for welding. The base is from a lawn edger.



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  10. racie35

    racie35 New Member

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    Looks rugged ...tack it on
     
  11. Dave31

    Dave31 Moderator
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    Love that cylinder looks kool!
     
  12. msrfan

    msrfan Active Member

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    Bill removed the large wheel on the opposite side of the flywheel to find a tapered shaft with no key way. Being part of the governor, it doesn't need to be timed, but he's going to use that side of the motor for the drive so we're figuring a way to attach a pulley. More pics soon.
     
  13. msrfan

    msrfan Active Member

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    Here's the old Briggs with the governor wheel removed, exposing the flyweights and dust shield.


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  14. dmb

    dmb New Member

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    i love this old stuff and the way you guys keep it that way. dennis
     
  15. msrfan

    msrfan Active Member

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    Hi Dennis. I see some older stuff with modern upgrades and you can spot it right away. Our goal is to present something that makes people ask how old it is. Adding patina doesn't always disguise a new part. I think finding vintage tires in decent condition is the biggest problem.
     
  16. msrfan

    msrfan Active Member

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    Bill's not moving too fast on this project. He did make a tapered adapter to fit an 8hp Briggs flywheel I gave him. Then reshaped it on his lathe. Needs to make a plate to hold the mag coil that goes with the new flywheel. I gave him a Musselman rear brake hub to help with the old look.
     
  17. curtisfox

    curtisfox Active Member

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    Ya! been a couple days, glad to see he isa putsing on it.Can't wait to see what he comes up with there...........Curt
     

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