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    Street bike Engine RMP reduced for a CVT
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    Member 67StingrayJ's Avatar
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    Ok guys. All the rage these days is putting a Street bike engine in a buggy, SXS, UTV, whatever you want to call it. BUT the thing is how do you pare one to a CVT transmission? I have long thought it would be possible but haven't really seen any substantial evidence that an engine putting out this many RPM, HP, Torque can be effectively transmit the power down through a CVT. If any of you know of a real build where this has been done I challenge you to post it here.

    From my extensive reading it seems as though the issue with mating a CVT to a street bike motor (Busa, R1, etc) is these engines power band has an RPM that is way too high for any CVT out there. But what if... What if you build a gearbox, or used a chain driven Jack shaft and reduce the RPM of the engine? Sort of like this....

    Sorry for the photo of an RC buggy... I couldn't delete it so disregard.

    So what do you all think? Can it be done? Good idea, bad idea?
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    Last edited by 67StingrayJ; 04-05-2019 at 11:40 PM. Reason: add photo...
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    Re: Street bike Engine RMP reduced for a CVT
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    Better off finding a snow mobile engine that is already setup for CVT.
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    Re: Street bike Engine RMP reduced for a CVT
    #3
    Keeper of the Asylum K-fab's Avatar
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    Quote Originally Posted by ODB View Post
    Better off finding a snow mobile engine that is already setup for CVT.
    Agreed.
    Some of the sled transplants into the UTVs are making stupid hp and don’t have all the gear box and clutch stuff in the cases. Sled engines are lighter and are designed to work with CVT clutches - it’s a win/win.
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    Re: Street bike Engine RMP reduced for a CVT
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    Seems a bit Rube Goldberg-ish to use a cvt with a street bike engine that already has a 5 or 6 speed transmission.
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    Re: Street bike Engine RMP reduced for a CVT
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    Member 67StingrayJ's Avatar
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    Quote Originally Posted by LIDUNO View Post
    Seems a bit Rube Goldberg-ish to use a cvt with a street bike engine that already has a 5 or 6 speed transmission.
    I completely agree with you LIDUNO. So how the heck are these guys getting these street bike engines in their buggies? Are you telling me that ALL of them have a manual transmission in them? Surely someone has successfully mated one to a CVT... no?
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    Re: Street bike Engine RMP reduced for a CVT
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    Chain drive to a rear sprocket drive and shift gears.
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    Re: Street bike Engine RMP reduced for a CVT
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    Quote Originally Posted by 67StingrayJ View Post
    I completely agree with you LIDUNO. So how the heck are these guys getting these street bike engines in their buggies? Are you telling me that ALL of them have a manual transmission in them? Surely someone has successfully mated one to a CVT... no?
    I would say most use the bike transmission. I'm sure someone out there has done it your way, but it would probably be the exception not the rule.
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    Re: Street bike Engine RMP reduced for a CVT
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    The Wizard bdkw1's Avatar
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    Does Rekluse make a clutch for those? Might be a option.
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    Re: Street bike Engine RMP reduced for a CVT
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    If you're dead set on it you might be able to lock the bike trans into one gear and remove the other unused parts of the transmission to save a little weight, but I think it probably isn't worth all that trouble.
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    Re: Street bike Engine RMP reduced for a CVT
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    Quote Originally Posted by 65chedderbob View Post
    If you're dead set on it you might be able to lock the bike trans into one gear and remove the other unused parts of the transmission to save a little weight, but I think it probably isn't worth all that trouble.
    I know I'm going way above what anyone would probably want to do, but he could eliminate all the gears in transmission. He could drive a cvt directly off the crank with some fabricating. Again, that's the hard way to do it.
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