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

[hot70cc]

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-SkyFir...ryZ11332QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[hot70cc]

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

 

[Alaskavan]

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).

 

[Scottm]

Here are other uses for lawn equiptment. I enjoy this thread, perhaps it will help with you idea. http://www.motoredbikes.com/showthread.php?t=4770

This is in that thread also, it's the bike I belive Alaskavan mentioned. http://www.motoredbikes.com/showpost.php?p=79336&postcount=57

 

[hot70cc]

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

 

[Alaskavan]

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

 

[gone_fishin]

see the install here: http://www.motoredbikes.com/showthread.php?t=8292