GEBE sheave&belt + FS billet motor mount build in progress

Discussion in 'Rack Mounted Engines' started by dchevygod, Apr 27, 2012.

  1. dchevygod

    dchevygod Member

    https://picasaweb.google.com/m/viewer?dc=gorganic&source=mobileproducts#album/105964032391208193272/5736315449702748833

    I have come this far and want some feedback. I plan on using another support from the seat post to the top bolt of the billet mount. IM going to a buddies house on Monday to lathe the 14-15t sprockets to fit the tapered shaft on the ADA clutch bell, I hope it goes well. The only important parts I'm lacking are engine and throttle assembly. My last build was a Schwinn scooter modded for a goped chain drive engine, it was recently stolen and am in desperate need of an engine with a 54mm clutch as well as a throttle assembly. For the time being ill go without a normal ht fuel tank and use a stainless steel bottle intended for water as a fuel tank, i already put 1 hole in the lid and ran fuel line to the bottom, now it just needs a hole for the return and vent. I just need a water bottle holder for my frame, some extra fuel line and 2 filters.

    I think its the cleanest belt drive rack mount I've seen so far. And its really pretty strong for not being fully supported yet. The belt tension is adjusted with a turnbuckle, but i want that extra support from the seat mount to the motor mount, it makes a triangle and will be super strong.
     

  2. lowracer

    lowracer Member

    no pics bro
     
  3. dchevygod

    dchevygod Member

  4. dchevygod

    dchevygod Member

    Really? It works on my phone? Ill have to try again some other time i deleted those pics from my phone. Does the one above work?
     
  5. lowracer

    lowracer Member

    Yes, I can see that pic.
    Post us some more...I like your setup...
    -Lowracer-
     
  6. dchevygod

    dchevygod Member

    here's the pics

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    Attached Files:

    Last edited by a moderator: May 11, 2012
  7. dchevygod

    dchevygod Member

    Hey thanks Low! I appreciate the compliment.
     
  8. lowracer

    lowracer Member

    dchevy
    That looks like a great setup!
    I am fond of belt drive & now have 3 MB's all v-belt drive.
    What kind of engine are you planning for this project?
    I've got 3 different engines on mine, a Suby-Robin eh035, a Tanaka pf3300, & a stage 2 pocketbike CAG & love them all for different reasons.
    Keep us posted...
    -Lowracer-
     
  9. dchevygod

    dchevygod Member

    engine choice is limited to a 54mm clutch

    I plan on using a Zenoah or CY 29cc RC engine. 3.5 HP @ 14000 RPM stock. Tons of upgrades available, simple design, reliable power. I have a BBK already and am looking for a used motor with a bad topend to rebuild. But if i have to i can get this for my 36mm BBK http://www.davesmotors.com/s.nl/c.885035/n.1/it.A/id.4419/.f
    and go from there with porting and a pipe.
     
  10. dchevygod

    dchevygod Member

    Yeah i like your black and orange downhill with the cag, i would personally prefer a rear mount, but it looks good and ill bet it rides even better.

    I'm trying to figure out a v belt setup for my 20" Haro with a 26" front wheel. Its still on the drawing board tho. Ill make another thread when i make more solid plans on that build.
     
  11. lowracer

    lowracer Member

    dchevy,
    Thanks.
    I love the Zenoah & the CY engines & bet they are way more reliable than the Cag's. I got lucky with this Cag but had to go thru 2 other duds to end up with this one good one.
    This cag pulls 11000 rpm's under load & is probably overkill for a bicycle (53mph @ 15.6:1 ratio), but the DH MTB handles the speed well. Although I'm limited to a narrow (1.25"-1.5") drive tire, I havent had a front flat yet (knock on wood)...I simply attach a rim hoop to the spoked wheel. Haven't had one fail yet & havent needed to replace any v-belts...If cars can run v-belts for many miles, I dont think I'll ever need to worry about a replacement on the MB's.
    -Lowracer-
     
  12. dchevygod

    dchevygod Member

    Gebe needs to make a sheave for a 20" rim. But since they don't I'm thinking I'll take a hoop from a 12.5" kids bike " 8in dia. " and attach to my 20" rear rim. If that works IM good to proceede with mounting the motor and figuring which size pinion pulley gets me close to 17/20:1final drive. V belt pulleys are cheap and rediley available, the htd timing belts/pulleys are hard to find and expensive! My Haro is gonna be Vbelt for sure.
     
  13. dchevygod

    dchevygod Member

    got her running today

    So I ended up building a 30cc CY/RC motor, i needed stuff to use a regular style Carb so IM using a ht carb for now. I got a 2l ht tank and made a throttle with scrap cables, its short but not by much. The speed is good but it needs a good walboro carb to accelerate properly. The belt doesn't drag much at all, just a slight whirr when pedaling but smooth under power. It just had it's first test ride so no GPS numbers till break in is done and a proper carb installed. Ill get pics up ASAP.
     
  14. dchevygod

    dchevygod Member

  15. lowracer

    lowracer Member

    dchevy,
    Looks great!
    I'm a big fan of 'keeping it simple'.
    I got my eye on a genuine Walbro carb on eBay now for $75 + $15 shipping.
    not sure if it would be a perfect fit on your engine?...Here is a pic
    Cheers,
    -Lowracer-
     

    Attached Files:

  16. dchevygod

    dchevygod Member

  17. lowracer

    lowracer Member

    dchevy,
    I priced out the different carb parts from Daves website (carb, velocity stack, filter, tubing, fuel filter) & it works out to about the same price.
    Glad you didnt get hurt...
    -Lowracer-
     
  18. dchevygod

    dchevygod Member

    Yeah thx low, I took my wheel to the shop for repair and put on the spare I had "pictured without a rear rotor" that wheel is toasted now I broke 6 spokes just tooling around at 25 or so?! I really like the gebe system it holds the spokes in place even if they snap. I haven't had a spoke fail on the other side tho, so I assume I have too much tension on the belt or I need to put a support strut from the axle to the bottom of the motor. The one from the seat clamp is good so maybe just another on the other side. I was also thinking of changing where the strut is in the u bracket from where it is right next to the billet motor mount to the out side of the bracket and mirror it on the other side to double up on support. I need to go to ace and get some stock I think I'm gonna do that. My wheel should be done today so I can get it changed and tested by tomorrow I hope.
     
  19. lowracer

    lowracer Member

    dchevy,
    I know GEBE doesnt recommend high output engines for their system. I think attaching the driven ring directly to the spokes causes more stress on the spokes & leads to spoke failure. With the engine you are running, I'd look into going really heavy duty (motorcycle sized) spokes...
    -Lowracer-
     
  20. dchevygod

    dchevygod Member

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