125cc+ Builds and Materials???

Discussion in 'Photos & Bicycle Builds' started by bakaneko, Nov 16, 2015.

  1. bakaneko

    bakaneko Active Member

    Hello. I have a 66cc 2-stroke motorized bike, cruise at around 20-22mph, and love it. But, in the future I think I want to have something that can go +50 mph with relative ease to keep up with traffic and a 4-stroke. There are a few options: a chinese scooter (~$800-900), a 125cc+ small motorcycle (~$3-4K), or a high power motorized bike ($???). I see a couple of the builds shown on YouTube but there doesn't seem to be a kit for the motors and every build seems to be home made. It looks like a chinese scooter is the best option but I don't want a scooter and like to explore a 125cc+ motorized bicycle build.

    Anyone got any ideas or guides on how to build a bike like this? I imagine that I will have to register it as a moped or motorcycle.
     

  2. 2old2learn

    2old2learn Member

    I'm thinking I'd go for a used motorcycle with not too many miles on it but perhaps 5 to 8 years old.
     
  3. bakaneko

    bakaneko Active Member

    Oh, the problem with used motorcycles for me is that I am short 5'5" so I cannot safely ride the 300cc bikes. I would love a Honda Grom but it is $3-4k and tbh I think a motorized bike with a 125cc+ engine can perform well comparatively. And, if we put some nice painted sheet metal around the engine it might look just as nice for fractions of the price. :devilish:
     
  4. butre

    butre Well-Known Member

    look into something like a Honda rebel then. much smaller than a sport bike or a dual sport
     
  5. butre

    butre Well-Known Member

    also, a china girl is perfectly capable of 55 or more miles per hour if you're handy with a dremel or have a thousand or so dollars. or you could build with a 50cc KTM motor, which makes power on par with a predator 420cc with good tuning and an appropriate expansion chamber
     
  6. bakaneko

    bakaneko Active Member

    Guys, I think I found the site and kits for it. They are definitely not on eBay. I found a few from gasbike.net, 212cc 6.5hp motors. I know the entire motorized bicycle idea is for simplicity and no registration/insurance. Having a 212cc bike is definitely beyond the legal bliss if where the motorized bike sit but I am fine with registering, getting proper motorcycle license, and insurance for that added speed and power. Looks like the kits are ~$200 range. That being said, I think this is definitely a good idea to further explore and economical too. $200 kit, $150 bike with disc breaks, and some sheet metal to create a nice style to the bike and hide engine.

    http://www.gasbike.net/bicycle-motors-4-stroke.html

    Here is a video of a guy riding one of the bikes. He seems to be going 50+ on it.

    https://www.youtube.com/watch?v=8Zj_TyZFJIY
     
  7. 2old2learn

    2old2learn Member

    I could be wrong, but it appeared he was using software to change his apparant visual speed. I do not doubt that he may be capable of 50+ mph depending on his gearing.
     
  8. 2old2learn

    2old2learn Member

    You will need to do your home work regarding bike selection due to the speeds you anticipate driving. Heavy duty all the way.
     
  9. bakaneko

    bakaneko Active Member

    Thanks for the points, m8. At the moment, I am thinking a fat tire 26" bike with disc brakes for the frame (still need to find one that fits the motor). I would like one with shock absorbers but that might not be possible and if I am not mistaken I think the lower PSI in the fat tire acts as a shock absorber.

    Additionally, I like to register it but I think I need to past an inspection in Wisconsin. I am not sure what that entails or if these motors can even pass that. LOL :shout:
     
  10. jaguar

    jaguar Well-Known Member

    find out first what steps are necessary to make one legal.
    for that size engine it may need to have lights, brake light, turn signals.
    I would only consider a 212cc that has transmission.
     
  11. 2old2learn

    2old2learn Member

    With that amount of power I'd only consider using a steel frame bike with a good reputation for being well built. I was a bit concerned about using an aluminum framed 29er bike with my 4 stroke Honda 50cc motor. I have mine rear mounted on steel supports with most of the load points located on the steel rear wheel mounts using grade 8 or better nuts and bolts. I've already destroyed 2 freewheel assemblies in less than 75 miles, while trying to be consciously careful. I have to solve that issue before I can proceed to use my MAB for its intended adventuring.
     
  12. bakaneko

    bakaneko Active Member

    Thanks for the points, guys. This is just in the preliminary planning and costing phase so these points definitely help to see if it is even possible before purchasing anything. I definitely want to look at the inspection requirements in Wisconsin to see if it is even possible to register and title it. If possible, I am really leaning towards the fat tire bikes and will keep in mind the frame material and strength. I like the look of these bikes and the tires and the added grip the fat tires add to biking.

    I mean so far bare bones : bike (~$250) + engine kit (~$250)...
     
  13. 2old2learn

    2old2learn Member

    I like the fat tire bikes and considered them too. I took the easy way out and selected a bike I knew I could obtain parts for in any large city and by overnight FedX. A Specialized Hard Rock 29er with front shocks, 21 speeds and dual disc brakes. I have headlight, taillight, turn signals, brake lights and high intensity flasher and horn. Here in my state it's still considered a bicycle with no registration or licensing requirements.
     
  14. bakaneko

    bakaneko Active Member

    The only issue with the fat tire bikes is that for standard motorized bike kit, the tires are too wide and we will need to offset the motor. I am not sure what is required of a 212cc motor but it seems for the common ones on these forums an offset is required. Dual disc brakes... god I wish I had those with my 66cc :tt1:
     
  15. butre

    butre Well-Known Member

    the wide angle lense made it appear that he was going faster than he was, not any software editing.
     
  16. bakaneko

    bakaneko Active Member

    I was able to discern his speed according to his digital speedo and it exceeded 50 at times. :helmet:
     
  17. 2old2learn

    2old2learn Member

    Your danger increases as the square of velocity on a bike. The 1st most dangerous speed is at zero because you'll fall over! Been there, done that, with clip ons. The only times Ive done 50 on bikes was going down big hills.
     
  18. butre

    butre Well-Known Member

    I don't doubt it, a 212 is easy to get to 50. I'm just saying the wide FOV made it look fast.

    even a 66cc is easy to get to 50 if you know what you're doing
     
  19. 2old2learn

    2old2learn Member

    I'm slowly learning that speed is of secondary importance, reliability is primary!
     
  20. butre

    butre Well-Known Member

    that's why I don't use any of the original bearings for my high speed builds. those are the weak link in most china girls
     
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