Boardtrack/bobber vintage motorcycle thing

Discussion in 'Antique Motorized Bicycles' started by Beau, Oct 21, 2010.

  1. Beau

    Beau New Member

    I hate the **** Chinese kits with a passion. So I found an tiny little engine and I'm gonna see if it works. I took a piece of scrap pipe and bent a new downtube for a Schwinn I had laying around. After hacking out a section of the down tube I welded it in. I cut out a plate to mount the Briggs and Stratton and have started collecting parts for the rest of the build.

    This evening I installed a different, rigid fork for tire clearance on the bike. I laced up a MTB disk brake front hub on to a Surly Large Marge rim. It's wider than any other MTB rim and with 2.4" tires they should be short and fat. I'm hoping the 24" wheels will give the bike a longer look without having to stretch the frame.

    I took an old set of cruiser bars that had the right bend and chopped them off so I had a nice, narrow set of boardtrack looking bars and installed inverted levers.

    That's about as far as I have made it for now.

    194? Scwhinn Excelsior
    26" Ross straight blade forks
    1951 Briggs 1 h.p. with centrifugal belt drive clutch
    Chopped cruiser bars
    Time trial bar end mount levers (inverted or reverse levers)
    24" Surly Large Marge DH rims
    Disk front hub
    24"x2.40 CST street tires


    This is just a mock-up picture of the frame. Non of the parts are it are going to be used.

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    Engine

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    Bars-

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    Rims-

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    Inspiration-

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  2. professor

    professor Active Member

    I remember that spinner on the old briggs- can really do a number on your leg. A recoil would be a lot safer.
     
  3. RedBaronX

    RedBaronX Member

    I love those rims! do they fit with run of the mill cruiser tires? I am still learning bike jargon as well as what dimensions of this-that-and-the other all mean...
     
  4. Beau

    Beau New Member

    I'm running the 24" so it will just squeeze in to the rear triangle. The fork I'm using has plenty of clearance though.
     
  5. Beau

    Beau New Member

    I plan to get rid of the recoil and hook up a freewheel to the shaft on that side. so it will be pedal start, but the bike won't actually pedal.

    That thing would for sure do some damage though.

    I also picked up a Tecumseh 3 h.p 2 cycle at a swap for $5. It's too tiny to put in the frame though. I think I'm gonna put in in ta 20" frame for the lady.
     
  6. Beau

    Beau New Member

    I got the rear wheel laced up this morning. I'm using an ATOM drum brake rear hub.

    Our shop camera sucks so the pics are a bit fuzzy.

    I'm still waiting on the tires I will be using. They'll be a tad bit wider than the one I have on the front.



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  7. RedBaronX

    RedBaronX Member

    I have got some serious rim envy... WOW

    Getting them would mean a heck of an overhaul though-- brakes, fork...
     
  8. Beau

    Beau New Member

    Yeah it is a bit of extra weight. Not much more than an standard set of heavy duty cruiser wheels though. I'm going to run a 203mm disk rotor on the front. I use them on my downhill bike and they provide a lot of power. I'm not sure the little briggs will power it though.
     
  9. Turtle Tedd

    Turtle Tedd Member

    Looks like you got a serious Old School build going on..I like it..Keep the updates and pictures coming
     
  10. Beau

    Beau New Member

    Today's work.

    Drilled handlebars for internal brake cables and baseball glove leather string for grips.

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  11. David in Alabama

    David in Alabama New Member

    Very nicely done!
     
  12. Beau

    Beau New Member

  13. Beau

    Beau New Member

    Did a little work tonight.

    This is ugly-

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    So I took it off for now so I have room to adjust the engine-

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    And since I only have bike tools and parts I did this-

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    But now I have to move the pedals-

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    And two final shots-

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  14. curtisfox

    curtisfox Member

    One awesome build you got going there. I have the plans that were in on of the early mags. like popular machanics back in the 40's or 50's they can also be found on gasbike web site. If you post or PM me your email I can send them.
    I love these home builds I am working on a Shaw clone will be close to what you are doing but taller frame......Curt

    I just realized that that thing you cut off. Was that a breather? If did you open one up somewere else like the valve tapet cover?
     
    Last edited: Nov 5, 2010
  15. Beau

    Beau New Member

    Curt- That piece I cut off was for the filler/drain. I purchased copper fittings and a tap to relocate the filler/checker today. I want to add a little bit of copper and brass here and there.

    Today I got pillow bearings, a three foot 3/4" steel bar and some 3/4" (19mm) BMX bottom bracket parts.

    I had some plate left over from another project and cut out a mount for the two pillow bearings. The pillow bearings hold a 3/4" shaft I cut down to 10". I got the bearing mount welded to the seat tube, so the jackshaft is now in. I need to buy one more pillow bearings tomorrow.

    Since I hacked away my oil filler/check on the front of the motor, I needed to make a new one. I bought some brass pipe threaded on two ends, a 90* elbow and a brass cap. I also purchased a pipe thread tap so I can tap the block and put in a new filler/checker. I'm going to solder in a piece of bicycle spoke into the cap so I have an oil checker.

    I also got my throttle lever welded on to the handlebar. I'm using an old Shimano 3-speed shifter flipped upside down and welded to the bar. It took some modifications to make it work. .

    The shifter looked like this-

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    I have a lot of pictures. I will have to post them tomorrow.
     
  16. curtisfox

    curtisfox Member

    Keep in mind weedeaters have some little triger throttles that clamp to the shafts.
     
  17. Beau

    Beau New Member

    Yeah, I looked at a lot of options. I don't want any clamps on the bars so I welded the shifter base on. Now it's basically a thumb throttle similar to a snowmobile or 4-wheeler.
     
  18. Beau

    Beau New Member

    Pictures from yesterday.

    Here is the jackshaft mounting plate with one pillow bearing mounted.

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    The new oil check/fill

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    Here's one of those "Hey Beau can you use this metal" moments. A piece of a store fixture happen to fit a euro BB quite well.

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    A trip to Fleet Farm (a.k.a. The Man's Mall) turned out to be really helpful.

    I found collars that fit different size sheaves (pulley's) that had a 3/4" bore. I had to buy the collars and sheaves separate and will have to weld them together. The sheave slides on tightly to the collar too.

    I stumbled upon 1/4" copper tubing in a 10' roll for a little over $5. It will fit 4mm or 5mm cable housing and I'm gonna use it to hide the throttle cable and brake cables.
     
  19. curtisfox

    curtisfox Member

    Post some pictures of the pullys. Pean the end of the spoke flat and file a full mark on it? I like your rear pully I will be doing the same except I will be useing a 24" on a 26" wheel. I am building a turn table to clamp the rim on so I can cut and weld it. I want to cut the center out and weld it back together, no spoke holes.Then I will cut the outer round lip off ( its a deep V type rim with the narrow center ) Then will put both rims on table and bend up some Z shape brackets and rivit them together.......Curt
     
  20. Beau

    Beau New Member

    Oops. I forgot to update here.

    I have the jack shaft mocked up now. I'm gonna need to gusset the mount a bit, but it should work good. I also need to shorten the jack shaft. Final word...It's not gonna pedal. I'm probably gonna have a tensioner pulley mounted on the chainstay too.

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    And the throttle lever-

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