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  1. #1
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    Anyone still messing with CVTs?

    I took my old modded cvt gsr40 out lately.
    Been modding moped variator transmissions a lot over the last few years, learned a ton...
    Finally got back to this gsr40.

    I did a few mods lately that really made it rip,
    Geared way up, to a 24 tooth front and a 60 rear. Will probably go taller still once I get a 56 or 52.
    Had to cut the belt tooth slots deeper as the small diameter of the vari hub and the small
    circumference of the belt really liked to balloon the belt out, causing slipping belt at takeoff.
    Sadly there's not much range in the rear pulley and very little room to mod it for more travel,
    which is a shame. The variator has tons of room for travel, by notching the vari walls to allow more travel.
    But without having more travel in the rear pulley it's a pointless exercise.
    I'll still try a few tricks as time goes on.

    I just gotta say how awesome it is to climb any hill out here,
    and I got some real ped killers. Doesn't even blink at Marin st in Berkeley,
    Or Potrero st in El Cerrito. They are vicious to walk up much less ride up.

    I still have one other gsr40 that I think I'm going to convert as well.
    Just once you run one of these it's hard to go back to single speed.
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  2. #2
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    Man, I figured you were out of the scene for good - great to see you back at it! I built one myself but needed to tweak the clutch to get it perfect. By the time I got back into it, they stopped producing the CVT I went with so I shelved it again. I was gonna look for an alternative CVT but now I've kinda lost interest.

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  3. #3
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    It's usually not the clutch that needs the work,
    usually it's the actual belt and rollers.
    If you ever go back to it I've really got them figured out now.

    I never stopped riding, just mostly ride my dot walkmachine style ped.
    That's the bike I do most of my errands with.
    Since it's so weird, I don't need to worry about anybody stealing it without it being locked.

    I can haul over 100 pounds easily on it's deck. It's very convenient. And of course, with the transmission I can also climb any hill.

  4. #4
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    I think today I gotta swap that deck, I like a bigger deck.
    Still really want to make a goped walk machine one of these days.
    I love riding with dual foot pads.

  5. #5
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    I would be happy to collaborate on a design! Anytime you wanna get together just let me know. I would love to see something viable for these little scooters that can handle long rides and are both cheap to build and maintain.

  6. #6
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    My idea would be to use a double rear frame, then use the frame to mount the foot pads.
    Just would have to find one of those frames, or chop up an existing frame for that extra gas tank side part.

    I've built some crazy shit in the last few years.
    Lots of water cooled billet heads, custom Frankenstein mopeds,
    Competed in a seattle to SD race on mopeds....I won
    So thrilling, had no chase vehicle, carried 80lbs of extra gear on my moped and still
    rode all day at 55-65.

  7. #7
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    Some bikes and one days start on pinball run
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  8. #8
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    You know, toymaker....
    All the cvt parts are available, or could be made pretty easily.
    The gears don't break down, bearings are actually not bad.
    Only probs I've had have been the main vari shaft loosening up in the inner races.
    I'll eventually just skin it with a lil braze then turn it til it's a tighter fit.

  9. #9
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    I'm happy to make a CVT setup, I just want it to be a bolt-on and go using the newest UNI-Frame.

  10. #10
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    Today I modded the rear pulley for more travel high and low,
    Which should help it reach higher top speeds.
    Had to cut the movable cheek's orings out but sacrifices have to be made.
    I'll just add grease sometimes

    The variator was already cut for more travel,
    So hopefully they'll play nice with each other.
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