Considering motorizing bike and power questions

Discussion in 'Introduce Yourself' started by macruadhi, Apr 4, 2011.

  1. macruadhi

    macruadhi New Member

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    Since I only get 14 mpg, I am nearly ready to build a bike. My only concern is that I am not exactly light. Like 300 lbs not light. As such I am pretty sure a 50 cc motor is not up to the job of carrying me to work at a decent pace. Can anyone point me in the direction of what size /type of engine l might need? The route I use to get to work is mostly level with a few hills in each direction.
     
  2. wdbtchr

    wdbtchr Member

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    Check your local laws concerning mab's. Some states don't specify a maximum displacement. If you are one of the lucky ones, you could go with the 79cc HF or even larger. I've run a 97cc Honda clone and the Toro snow blower engine with good results. Or with a printer and some decal paper you can make the engine any size you want.
     
  3. virginian

    virginian New Member

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    50 cc is adequate for the job. On the flat, the resistance comes mostly from wind resistance, not from weight of rider and bike. With a good system you can get 30 mph on the flat.

    Hills are another matter. If you have big steep hills to climb, you will need to gear down the motor. That will reduce your top speed on the flat to probably 20 to 25 mph. Pedal assisting on the hills will also help somewhat.

    But make sure the bike frame that you have is strong. And make sure you have really heavy duty wheels.
     
  4. curtisfox

    curtisfox Well-Known Member

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    YEP the 4 stroke would be the best more low end tourq for pulling, even if it is 50cc. Bigger the better,like said check the laws.............Curt
     
  5. Nougat

    Nougat New Member

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    Don't get me wrong, these machines are super fun, and if you want to build one, this is definitely the place to get started. But don't think you're going to be saving any money doing it under ordinary circumstances.

    Unless you're intending on selling your current vehicle and replacing it with a bike, it will take a lot of riding to get to the break even point. Like six months of replacing a ten mile a day commute with the bike five days a week. That's not even calculating in the hard cost of safety gear (helmet, jacket, gloves, lights), or the cost of replacing failed equipment, or the risk of injury due to mechanical failure or inattentive drivers of other vehicles.
     

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