Belt drive for 2cycle motor kits

Discussion in 'Spare Parts, Tools & Product Developement' started by Ra1977, Sep 6, 2015.

  1. Ra1977

    Ra1977 New Member

    Where is the the belt drive for these 2cycle kits. I know that chain is heavy.

  2. butterbean

    butterbean Well-Known Member

    Doubt a belt pulley would fit where the sprocket goes on the engine.
  3. Ra1977

    Ra1977 New Member

    Belt drive

    Well I see those razor scooters have belt drive setups(yes I know some have chains) so I figured why not a MB. Of course the scooter setup prolly might not be strong enough though the cog on the motor is real small I think something could be made for these MB kits. I'm thinking a lot lighter than chain and safer
  4. butre

    butre Well-Known Member

    there's no way to adapt the existing design, you'd have to redesign half the motor or lead a chain to a pulley.

    a chain is heavier sure, but we're talking mere ounces. if you want to drop a couple ounces off your bike then skip lunch. a chain delivers power more effectively anyway
  5. Ra1977

    Ra1977 New Member

    What r u runnin .butre?
    if I'm allowed to ask
    I was wondering because I see those e200 razor scooters with belt drives. Obviously that setup may not work for the motors though.... Maybe something similar. I would prolly make a hole in the side of the cover to clear the width of the cog. My big QUESTION is would gearing ratios be the same. Because I see those one bikes with the big ol ring on the back wheel for a belt and I don't want that.
  6. butterbean

    butterbean Well-Known Member

    If the pulley is too wide to fit between the engine and clutch cover, how is the clutch going to work if you cut a hole through the cover to make it fit?
  7. butre

    butre Well-Known Member

    I'm running a plain old 2 stroke China girl, but with a stuffed case, reed valve, and major port work. I know these engines inside and out and I'm telling you there's no way to go belt driven.
    Timbone likes this.
  8. butre

    butre Well-Known Member

    you could maybe get away with welding the existing clutch shut, removing the drive side cover, and using a belt tensioner as the clutch but that's janky as hell
  9. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    I have seen a belt driven China girl where the belt replaced the chain.

    Don't know how well it held up though.
    Ra1977 likes this.
  10. RA77

    RA77 New Member

  11. 5-7HEAVEN

    5-7HEAVEN Active Member

    You have the power to change your gear ratios.

    If your bike has a 10-tooth engine sprocket and 40-tooth rear sprocket,
    use a 1" engine pulley and 4" rear pulley.
    or a 1.5" engine pulley and 6" rear pulley
    or a 2" engine pulley and 8" rear pulley.

    Do not mix and match, if you want to keep the same gear ratio.

    Mix and match to raise or lower gearing.
    Last edited: Aug 27, 2017
  12. Frankenstein

    Frankenstein Well-Known Member

    Yet nobody is doing it... Damn chains and sprockets being so practical and easy and already available!