My next project

Discussion in 'General Questions' started by Edward, Feb 17, 2007.

  1. Edward

    Edward Guest

    I've been gathering the components for another Stingray to take up where the first one left off in reliability and speed. I've purchased a 79 Motobecane rear wheel to address the rear race failure. Using an axle off an electric scooter and the spacers that came with it, its a bolt in. It also has a NOS drum brake assembly from Dan at 1977 Mopeds. The next aspect is the engine, the china engine is just not in the same league as a moped engine, the materials, the engineering, power, and the structural integrity are wanting when you're trying to run with the mopeds. I've purchased an upgraded Sendai Tai Chi 40cc. with an x-chamber from PBU, it features a centrifical clutch and a pull start. Expensive but it should serve my purpose. The first frame has cracked on me once and the new one is going to get a thorough gusseting. Next is a springer fork, I'm leaning toward the smoked chrome one from Choppers USA unless something better comes along that will take a wide front tire hopefully with some brakes. I'm going to call it an SR-71 if it lives up to the name. 8)
     

  2. srdavo

    srdavo Active Member

    sounds like a plan. keep us posted?
     
  3. SR-71? So that would be from the Skunk Works right?
     
  4. etheric

    etheric Guest

    Sounds like Skunk Works to me. Make the Lockheed boys proud Edward.
    I'm looking forward to seeing this come together. I've been interested in the drum brakes too, I was looking more into tandem brakes however.
    I've got some parts heading my way from 1977 too, and I'll just mention that Dan is the man.
     
  5. gone_fishin

    gone_fishin Guest

    wow, sure sounds like you're gonna build one kick*ss MotoredBike, Edward :evil:
     
  6. Edward

    Edward Guest

    Finally bit the bullet and pulled out the 220v. mig welder I bought a couple of years ago. My last experience with one of these was in H.S. and it was a bad deal, the instructor didn't have time to give me some guidance and my efforts to teach myself didn't turn out. These Lincolns are different and totally rock, I was worried about punching through on the Schwinn frame when attaching the 1/8 plate, but luck was with me this time. The engine is mounted and now I have to figure out the expansion chamber mounting as the fit is a no go.
     
  7. Edward

    Edward Guest

    http://usera.imagecave.com/Edward656/PICT0008.JPG

    Its rude and crude, but its on there. Some imagineering needs to be done to make the engine sprocket match the #40 chain, the machine shop may get a go at this after I take a few wacks at it. Function precedes form.
     
  8. Edward

    Edward Guest

    GRRR... The machinist is going to want $180 to CNC the sprocket and shaft. The cost will go down if I do the design and and drafting work. So its 19th Century meets 21st Century, my bodging with a dremel meets the computer age.
     
  9. srdavo

    srdavo Active Member

    That engine looks tough-mounted. can't wait to see it rolling.
     
  10. That things going to be awesome. Looks like 40cc's of case reed valve inducted goodness. Oh yeah, moped brakes are the bomb.
     
  11. Edward

    Edward Guest

    The tiny #25 front sprocket has triumphed over the motobecane rear wheel in the build over which stays and which goes. So a #25 47 tooth sprocket has been purchased and installed on a heavyduty standard coaster wheel. All was progressing until the axle shaft came into the picture, Schwinn China apparently in homage to the olde Schwinn USA uses a different thread count on the axle shaft so the brake/bearing race piece doesn't go.grrr.
     
  12. Edward

    Edward Guest

    Well while attempting to rethread the bearing/brake hub, the tap snapped off in the piece. Now I'm slowly grinding the tap out with some grinding bits and a drill press. Progress is slow and tedious.
    Just got the darn thing out, now on to the next roadblock!
     
  13. Edward

    Edward Guest

    So I'm using all my toys, the new hand grinder with the sandpaper disc that chews up steel like butter, the mig welder, the drill press with movable vice, having a grand old time, when I'm about to mount the tire on the wheel. Its a heavy duty 20 inch with about 3 hrs of modifications on it, I'm mounting a 4 inch wide Stingray tire I scored for $2 at Wally World with a matching $2 tube and come to the realization that I don't have one of the little rubber strips that keep the spokes from rubbing the tube. Its a 30 mile round trip to get one from Wally World or wait till tomorrow and get it when the bike shop across the street opens. I could use electrical tape like when I was a kid but I'm trying not to make too many compromises on the project lest the gods of 2-stroke smite me. So the project stalls again..
     
  14. JosephGarcia

    JosephGarcia Guest

    cut a flat length from an old innertube and maybe you can glue the ends together or overlap and tape them. electrical tape distorts weirdly with heat, i know becuase half my bike is held together with it.
     
  15. Edward

    Edward Guest

    Well today I wheeled the monster out and started it up. Temporary deafness was the immediate result, the cacophany was astounding. There is however a snag in that the clutch does not yet engage, more research is in order.
    [​IMG]
     
  16. Papasaun

    Papasaun Guest

    Very nice indeed. great color scheme going with the silver on black. can't wait for the report on how it runs down the road.

    Papa
     
  17. srdavo

    srdavo Active Member

    That is coming together nicely.
     
  18. Edward

    Edward Guest

    The clutch on this thing needs adjusting, it only engages at full throttle and then the response isn't stellar. The vibration of the Sendai Tai Chi is much like the Kings 80cc. only more so if that is possible. My left hand is swollen after only four blocks and the noise level is extreme while the forward speed is miserly. Pedaling up to speed before revving the engine might be needed due to the small rear sprocket.
     
  19. srdavo

    srdavo Active Member

    hmmmm? does it need another gear reduction?
     
  20. Edward

    Edward Guest

    Just got off the phone with a technician at pocketbikesunlimited where I purchased it. They feel that the springs may have too much resistance and are sending me a clutch assembly. Good service.
     
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