Weed Wacker Engine Bicycle

Discussion in 'DIY Home Built Motorized Bicycle (non kit)' started by DaBucs87, Sep 8, 2009.

  1. DaBucs87

    DaBucs87 New Member

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    hi, i had this old weed wacker laying around so i decided im gonna put it on my bike and have a motorized bike. so everythings set, i have the bike, the engines rdy to be installed but i have a few questions. im gonna do a gear ratio of 18.75 like i hear most ppl but how do i do that? i kno its with sprockets and stuff and the amount of teeth on them but how do i get the proper gear ratio? i kno i sound stupid but i rly dont kno that much and wanna learn. plz help thanks.
     
  2. jay sawdust

    jay sawdust New Member

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    The other day i was riding around town....stopped for a smoke and a kid pulled up on his weedwhacker bike...it was absolutely a zero dollar build....a juckyard bike...a peice of plywood for a rear rack that he bolted the motor to with a gastank from other yard tool tied behind the motor....he had a small sprocket attached to the motor and a larger sprocket somhow attached to the wheel....he removed the crank and bolted a 2x4 for a footrest....im positive he dident count any teeth on the sprockets.....but the thing was he took a good look at my bike and said....bummer ya gotta peddle to start that thing.....then he pulled the rope pull and took off like a shot.....it was a beautiful thing....i was proud of the kid from my town.......Moral to the story.....just build it man!!!! wish i got a pic of this guys ride.... good luck.....j
     
  3. geeksquid

    geeksquid New Member

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    That's why I carry my camera on my belt everywhere I go.
     
  4. diceman2004

    diceman2004 New Member

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    lessons learned through trial and error are the most valueble lessons to learn

    untill you make the same mistake twice
     
  5. hick185

    hick185 New Member

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    hi. i just finished building my own motorized bike. i haven't even gotten to make a post about it. I used a 27cc weedeater engine that i mounted in the frame of my 26" mountain bike. I had previously had it set up as a friction drive. I decided that i didn't want to pedal anymore so my bike only uses engine power. I have it set up with a 23 to 1 gear ratio and i kept the centrifugal clutch. i weigh about 200lbs. the bike does pull me from dead stop but it is slow to take off. so far i've had it about 15mph(no speedo just estimate). i haven't had enough time to get it out and try to go faster. it doesn't like to pull up a hill on a take off but with pedal assist you should be good to go. just give it a try. most likely you'll get frustrated while building it but just take your time and do it right. oh one more thing have fun.
     

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