New Drive Train Mount

Discussion in 'Rack Mounted Engines' started by kerf, Sep 7, 2009.

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  1. kerf

    kerf Guest

    I finally got around to building and replacing the Staton gear box mounting struts. Since I made the decision, long ago, to employee a spring loaded idler, I didn't need the adjustably of the original struts. Since they would allow the gearbox to "bounce" when hitting bumps, I had pined them into fixed struts soon after the initial installation. While David's system worked, I found it to be heavy, bulky and just plain ugly. I also wanted to incorporate rubber isolator bushings to reduce engine vibration.

    Friday, I picked up an 8' bar of 1/4" x 1" flat aluminum and cut my struts and a new idler. The box mounts with 3/8" bolts but I made the mounting bolt holes 9/16" to allow for the bushings. Since I haven't been to resolve runout issues with the Staton freewheel adapter I was using on my output shaft, to facilitate the two speed, I've gone back to a fixed 18.75 / 1 ratio. Shame too, as the shifting was perfect. On the plus side, I cut some more weight and chain noise. I would now put my bike up against a Vespa, as to total noise, probably lose but it would be close.

    I went out at 5:30 this morning for a 20 mile run and was very happy with the results. The bike accelerates smoothly and quickly to 40 mph, where it tops out at about 9600 rpm. The exhaust and intake silencers have slowed me some but it was well worth it and I'm also running a little on the rich side. With the 32/1 oil mix, I've got over 1000 miles on this original top end and it's strong as ever, guess I'll live with being slow.

    Attached Files:

  2. srdavo

    srdavo Active Member

    Very nice work. Looks solid!!
    I like your spring loaded tensioner.

    you have quite the Control Panel on your handlebars.

    sorry it runs soooo slow!! :jester:
  3. 5-7HEAVEN

    5-7HEAVEN Guest

    Excellent work, kerf. I might try making those same mounts when I install my Staton box.:detective:

    Are you still running two sprockets on your Staton box?
  4. kerf

    kerf Guest

    I've taken the dual sprocket off for the time being. I made that setup from a Staton 5/8" shaft freewheel adapter, with a couple of track sprockets installed. The bike was surging, in time with sprocket rotation, so I checked both FW adapters for run-out and found .006" & .009". I've emailed David to see if he supply one that's concentric, no answer yet.
  5. DetonatorTuning

    DetonatorTuning Active Member

    the new mounts and idler are very nice indeed, congrats on that.

    too bad about the freewheel dilema though, the 2 speed arrangement was an equally well concieved project.

  6. loquin

    loquin Active Member

    How's that muffler working?
  7. kerf

    kerf Guest

    Great, engine runs good, much quieter and it doesn't leak oil. The old ones used exhaust tubing to connect the factory to secondary muffler and leaked like crazy.
  8. kerf

    kerf Guest

    Good news for anyone interested, I think I've solved my two speed problems. It's back together and in a short test ride yesterday evening, I has zero surging. When I started out for a longer ride this morning, it was raining. As soon as it stops I'll run the heck out of it and see for sure.
  9. DetonatorTuning

    DetonatorTuning Active Member

    excellent news, looking forward to more positive reports.

  10. kerf

    kerf Guest

    Just got back, shifting and riding smooth again.
  11. TREEWK

    TREEWK Member

    Kerf, That Is A Very Nice And Clean Build. I Know Nothing About That Gear Box (learning Everyday Though, Great Forums). That Should Be A Trouble Free Ride. Fine Looking Machine. Ron
  12. machiasmort

    machiasmort Active Member

    Nice fab Kerf! Did you piece meal all that together or is that a kit I'd be able to buy?

    I guess I'm asking, if you had to do it all over again!

    I'm very fond of the tensioner system!
  13. kerf

    kerf Guest

    Staton box and wheel, I hobbled the rest together. Other ideas always floating around somewhere in my head. It never seems finished, curse I guess.
  14. RogerS

    RogerS Member

    Is there any chance of seeing your two speed set-up? I've got a Stanton Inside drive myself, and that sounds like just the ticket.
  15. loquin

    loquin Active Member

    Take a look here. (Found it using the advanced search option, entering 'kerf' as the thread starter, and a search term of 2-speed)
  16. RogerS

    RogerS Member

    Thanks! 15 pages worth!