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  1. #1
    Nut infinityeye's Avatar
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    25cc motor chain drive question

    Hi,

    1. I am crazy
    2. Yes I know this is dangerous/stupid etc...

    3. I want to put a 25cc engine on a rear rack. attach it to a 53t road ring that is bolted to the wheel on a bike. I have rebuilt this little engine and got it idling again. I have all the stuff worked out except the "front" sproket. Does anyone know where I can get a sproket or sproket/centri clutch that will attach to this motor? It has a bell centri clutch on it now that ends in a square taper for a worm drive (weed wacker). I am thinking I need to remove this clutch and hopefully find a bolt on clutch/sproket to get the drive line in place.

    4. Yes I know this is wack, but I get bored with johnson at the office all day!

  2. #2
    Canon fiend MadMan2k's Avatar
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    That's a better idea than mounting an engine in the front triangle, IMO.

    You could get a cheap small chainring somewhere, or better yet use a cog for putting on the motor itself. Like an 11 tooth cog on the motor and a 32 on the wheel... otherwise it'll be geared too high and wont accelerate too well.

  3. #3
    meb
    meb is offline
    Senior Member meb's Avatar
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    Quote Originally Posted by MadMan2k
    That's a better idea than mounting an engine in the front triangle, IMO.

    You could get a cheap small chainring somewhere, or better yet use a cog for putting on the motor itself. Like an 11 tooth cog on the motor and a 32 on the wheel... otherwise it'll be geared too high and wont accelerate too well.

    Not sure why you think rear is better:

    http://joesacher.com/cycling/motorbikee.php

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