5.5hp engine on chopper bike

Discussion in 'Photos & Bicycle Builds' started by stephen115, Jun 8, 2010.

  1. stephen115

    stephen115 New Member

    Here is my project I have been working on for awhile now.

    Left to do is a custom exhaust, back sprocket, throttle and brake, also paint some pieces of the bike.

    In order to get the engine to fit I had to completely delete the bottom bar and drop it down 2 inches so the engine could clear(shown in the picture)

    I ordered the 14in apehangers from uschoppers.

    the gas tank is a nos energy drink bottle,(it actually works) but I don't know if it will be my permanent setup.





    Last edited by a moderator: Jun 8, 2010

  2. give me vtec

    give me vtec Active Member

    nice bike...

    correct me if I am wrong but... isnt that a small illegal motorcycle???
  3. Cavi Mike

    Cavi Mike Member

    Where's the pedals mate?
  4. stephen115

    stephen115 New Member

    haha, i dont know, we will find out though!
  5. stephen115

    stephen115 New Member

    still working on that, I think im going to just weld the pedals that were on the bike and flip them forward. and weld them in place.
  6. james65

    james65 Member


    Looks good!
    Good looking welds, did you do the welding your self?
    Seems to me that 5.5 is much more than that bike needs. If you gear it low, it will be very impressive. Although you will be replacing tires.
    That bike (without suspension) is only really good up to 30MPH very unstable after that.
    Keep up the good work.
  7. stephen115

    stephen115 New Member

    i didnt know about the 30mph limit, can you tell me more about it, before i get too far into my build?
  8. james65

    james65 Member

    5.5 hp

    Just remember this is just my opinion! However it is based on a lot of miles on s-ray occ's. My single speed tops out at 35mph. The 5 speed will go faster. 35 is fun on a SMOOTH rolling twisting road.
    However small sharp bumps take the fun out of it, as keeping it upright becomes my prime concern. I believe suspension would be a great help.

    You have gone too far to throw in the towel now! Finish it and see what you have. You might check with other OCC guys also, there is a lot of them on this board.

    Attached Files:

  9. RedBaronX

    RedBaronX Member

    I'm new to this too, but I keep reading that a "motorized bicycle" has to retain pedal-power capability to keep its "MB" status...

    if you can't pedal it, then it becomes at least a "scooter"... and that's a whole different set of rules and regulations
  10. Fulltimer

    Fulltimer Member

    Stephen115: Please do a LOT of reading on here. So far you probably have a couple of things going wrong that can run you into trouble with the law.

    1. The engine is too big for a bicycle
    2. Too much power to be considered a bicycle
    3. Top speed would be over the limit set for motor assisted bikes

    Consider using a real gas tank also. My hats off to you though for what you have done. You could always continue building it and only use it on private property. If you did that you could go wild!:cool:

  11. azbill

    azbill Active Member

    could you make the pics bigger ???
    I can't really see the details LOL :whistling:
  12. Fulltimer

    Fulltimer Member

    They like small pictures on here.

  13. professor

    professor Active Member

    Nice project Stephen, Don't let these guys pull your chain too far.
    Do find out what is necessary to be legal in your state.
  14. azbill

    azbill Active Member

    just in case my sarcasm was lost in translation,,,
    clickable thumbnails are much better ;)
  15. motorpsycho

    motorpsycho Active Member

    wow man, you have a lot going on there. you have done a lot of great engineering as far as getting the motor mounted ot the frame, BUT.....I'm
    not sure i'd trust that bike at any speeds over 30 mph. the bearings in the hubs are not caged bearings, they are just ball and cup bearings. and if you haven't taken the hubs apart and re-greased the bearings, i would at least do that. these bikes come with minimal grease on the wheel bearings (and it looks like it's thick, nasty recycled grease at that) the brakes on these bikes are not the best either.
    you need to loose the nos bottle "gas tank", and take that white spray paint off the tires (they don't look like whitewalls...they just look like what painted tires).
    just my opinion.
    Last edited: Jul 17, 2010
  16. RedBaronX

    RedBaronX Member

    yeah, just because gas containers are plastic, doesn't mean ALL plastics are safe for gasoline. A drinks bottle is going to be way down on the "food chain" of quality of plastic...

    remember, plastic is a petroleum product; gasoline is a petroleum product. Get the wrong kind of plastic, and gasoline becomes a ready solvent...
  17. motorpsycho

    motorpsycho Active Member

    there are literally hundreds of types of plastics, and they all have different chemical compostions. h.d.p.e. (high density poly ethylene) is the type plastic that shampoo bottle are made out of, and they contain mica, which makes them very strong.
    P.E.T. or P.E.T.E. (Polyethylene terephthalate) is what pepsi , coke and clear water bottles are made out of, and it's a much "harder" plastic but fragile to certain chemicals at the same time.
    all you have to do is look on the bottom of the plastic bottle and it will tell you what it is made of. I would not use anything to hold gasoline other than an approved gas can (plastic or metal). plastic gas cans are made of H.D.P.E like shampoo bottles. so really, you could use a shampoo bottle to hold gasoline, but a shampoo bottle will not be an officially approved container because it is not U.L. listed and classified as a safe container for gasoline. plus, a shampoo bottle will not be vented to allow the fumes to escape when the fumes build pressure from heat.
  18. ChoppedTrikes0324

    ChoppedTrikes0324 New Member

    Nice work i think it's great. Im putting a 5.5 on my stretched trike.
    Last edited: Aug 23, 2010
  19. oologah

    oologah New Member

    Build it and ride it where ever you want. It's only illegal if you get caught, (IMO) it's not like your using it to rob banks.
  20. gearhead222

    gearhead222 Member

    NICE work, regardless of the legalities! Keep us updated!:)-Gearhead