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I want to try to use may leaf blower engine???

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hot70cc

Guest
Ok i want to do a rack mount , here we go . I want to try to make a motorised bicycle out of my leaf blower engine. it is a 4 stroke engine. runs perfect. It is big leaf blower it is one of those that has a back pack on it it. I was told it is almost 40cc. So i know it will work for a bike. The only problem that i run across is me being new to this kinda stuff but i'm sure it needs some kind of gearbox. Because when i start it ,the propeller is moving way to fast to be on a direct sprocket, so i'm sure that would not make the engine run being so much of a slow revolution on a direct sprocket. I was wondering if i would need a gearbox and how do the gearboxes work. My only conclusion of a gearbox is the more throttle you give it the more the friction plate connects with the gears. Is that what a gearbox is used for?????. Do i Need a gear box??? And can i use this one on ebay?? http://cgi.ebay.com/4-Stroke-SkyFire-Motorized-Bicycle-GEARBOX-Updated_W0QQitemZ220188926776QQihZ012QQcategoryZ11332QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
 


H

hot70cc

Guest
Ok after doing some searching on here, i think i found a way to do the easiest install. Most people that i had saw on here uses a shaft that rest on the wheel. My only concern is if i would make the shaft perminatly resting on the wheel, wouldn't that make the engine stall everytime i stopped the bike?? Would that hurt the motor in any way? Also i'm guessing i wouldn't need the pull start to start the bike if it was perminatly resting on the wheel
 
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Alaskavan

Guest
If you build the motor mount so it pivots, you can raise the friction roller off the tire to stop without killing the engine (I think iride posted a cool example).
 
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hot70cc

Guest
so basically the weight of the engine is the only friction the shaft has to the tire???
 
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Alaskavan

Guest
If the engine weight is not enough, a spring could be incorporated.
 
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