power/weight ??

Discussion in 'General Questions' started by fasjake, Sep 28, 2016.

  1. fasjake

    fasjake New Member

    Newbie here. I'm an experienced bike builder, but have never played with motorizing one of my creations. Most of my builds are vintage "ratrod" bikes. My current project is a recreation of a early 1900s board track racer. Nearing completion, i noticed it's missing something.... a big gaping hole where the heart of the cycle should be. Or maybe it's just the inner kid in me that wants to go fast and hear something go "vroom". My question is; 48cc or 80cc? Whereas most bicycles ive seen receiving a motor weigh in at 25 to 35lbs, my bike is currently closer to 60 or 70lbs. I weigh around 175lbs. Which one should i go with(legality aside)? With this amount of weight, is it going to get up to a decent speed without burning the motor out? Also, any pointer for me on my first motor kit install? Thanks in advance.
     

  2. jaguar

    jaguar Well-Known Member

    heavy people should get 69/80cc. both engines weigh the same. stock speed is around 30mph and with many mods you can get 50mph.
     
  3. fasjake

    fasjake New Member

    How should i dampen the vibration at high rpm on a 80cc kit? Or is vibration usually not to much of an issue.
     
  4. jaguar

    jaguar Well-Known Member

    some kits aren't too bad. if it vibrates too much you need to take the crank out and drill extra balance holes in it.
     
  5. fasjake

    fasjake New Member

    That makes sense. How are the ebay kits?
     
  6. jaguar

    jaguar Well-Known Member

    I have no idea. probably very bad
     
  7. fasjake

    fasjake New Member

    Any recommendations for a kit.
     
  8. jaguar

    jaguar Well-Known Member

  9. Photo of bike?
    Do you have room for an old Briggs 4 stroke?
     
  10. fasjake

    fasjake New Member

    I have room for a harley 1000cc
     
  11. fasjake

    fasjake New Member

    I dont have any pictures handy, but the photo is exactly what i have built on a 26" frame. I built the bike the same as it would have been built back in the early 1900s as a board track racer. No track will let you ride these things anymore in my area and the police would be sure to ticket me if i did throw a 1000cc in it as i couldnt make it road legal.
     

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