my official build thread. pro street bike

Discussion in 'Frame Mounted Engines' started by runslikeapenguin, Jan 20, 2009.

  1. hello all.

    a while back i decided to stop driving a car while i went to school and start riding a bike, and i discovered that my dad had an old moped stashed among the bikes i had stored in a shed we had. so i basically rebuilt the thing in one afternoon and hit the streets for close to a year loving every crazy adventure of a ride. well i moved out of the state and i dident take it with me so instead of paying a hefty price for another moped i figured i could build a pretty sweet motorized bike for less money and get something cooler.

    originally i was going to build this thing completley custom from the frame up but i realized that i wasn't sure exactly what i wanted, its hard to make decisions like rake, trail, wheel base, post height, pedal placement, gearing vs wheel size etc. etc.
    so im going to do a preliminary build with a 26" beach cruiser frame and go from there. when its all done i will sell it and start over from scratch and build exactly what i want.

    my moped would top out at 32, had decent pep with a centripetal clutch paired up to a 50cc engine. i was fairy happy with the cruising speeds, the dead stop pull power and the top end that was limited by the gearing and the clutch. so with a 70cc engine, an expansion chamber, some port work, a balanced bottom end with better bearings, a tuned bigger carb with a custom manifold a boost bottle and possibly a reed cage (not sure if im going to go there yet) boosted compression and the right gearing, all bolted up to a lighter frame, im hoping i can get this thing to haul some ***. im thinking cruising speeds of around 30-35 and a max out around 45+. yes im nuts.

    so here's what im starting with.

    http://s114.photobucket.com/albums/...fabrication/?action=view&current=DCP_3822.jpg

    http://s114.photobucket.com/albums/...fabrication/?action=view&current=DCP_3823.jpg

    http://s114.photobucket.com/albums/...fabrication/?action=view&current=DCP_3824.jpg
    its a shame the paints actually super high quality metal flake 2 stage. why the company i bought this frame from painted it with this i dont know but its coming off for welding and new paint. its hard to see but trust me its pretty up close.
     

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  2. She ought to be sweet, dig that seat. Find a used donor bike. It gets real expensive building a whole bike one part at a time.
     
  3. i have a few bikes i could use a donors but if im planning on exceeding the speeds im setting for my self, and make it sane at those speeds i cant cut any corners.
     
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