What 4 stroke for my first build?!

Discussion in '4 Stroke Bicycle Engines & Kits' started by jahanness, Sep 17, 2016.

  1. jahanness

    jahanness New Member

    Joined:
    Sep 17, 2016
    Messages:
    1
    Likes Received:
    0
  2. TheNecromancer13

    Joined:
    Jan 21, 2015
    Messages:
    603
    Likes Received:
    10
    Better option would be to use the 79cc, but not get the kit. The predator kits do not come with everything you need to build a bike, and what they do include is marked way up so the seller can make a profit. Also the predator kits have no instructions. If you want to build a predator bike, build it from scratch. I have made a tutorial on how to do this which can be found here: http://www.instructables.com/id/79cc-Motorized-Bicycle-From-Scratch/
     
  3. KCvale

    KCvale Active Member

    Joined:
    Feb 28, 2010
    Messages:
    3,884
    Likes Received:
    16
    Ya, that frame is a gasbike cheap knock-off of the real Grubee Skyhawk frames, for example no rear disc mount.

    Yes, there is a pretty good 'other option' now, well soon as I have a heath issue right now.

    The 49cc or 53cc are enough to power you up to ~40mph and tackle hills and still maintain ~20mph because of the bike gears.

    I modify a Skyhawk 4G to a 10G long shaft of my design to drop the engine output over the pedal systems sprockets.


    [​IMG]

    The main 100T belt pulley is a freewheel, which means you have virtually no drag from the engine part even with the engine off when you pedal.

    [​IMG]

    In short gears rock ;}
     
  4. bluedogeli

    bluedogeli New Member

    Joined:
    May 13, 2009
    Messages:
    5
    Likes Received:
    0
    how did you extend the output from trans to pilot bearing?
     
  5. KCvale

    KCvale Active Member

    Joined:
    Feb 28, 2010
    Messages:
    3,884
    Likes Received:
    16
    I designed a new shaft and got it made ;-}
     
  6. bluedogeli

    bluedogeli New Member

    Joined:
    May 13, 2009
    Messages:
    5
    Likes Received:
    0
    Merry Christmas! Any suggestions on design and fabrication?
     

Share This Page