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  1. #21
    Charles S's Avatar
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    Quote Originally Posted by DavidB View Post
    Well, I ordered one of those Walmart $55 TC's. I am hoping it will require minimal modification to either it or the bike to fit.

    In some ways, the TC seems like it will do the opposite of what I want. IIUC, as the RPM's increase, the gear ratio decreases, resulting in higher MPH. What I want to do instead is increase the RPM's while keeping the gear ratio high, and MPH low.

    I'll just have to install it and play with it to see what it actually does in the real world.

    Will I probably keep my original final chain length?

    I'll keep you guys posted on how it works.

    David
    Did you check your crankshaft diameter? If it isn't 3/4", it won't be a simple install. If you ordered the TC linked in post #14, you didn't purchase it from Walmart, so no easy Walmart store return (seller is Auto Express). If you don't have a 3/4" crank, you will need to replace the crank, replace the engine, or make it work using an adapter. I'll link a good thread on using an adapter; the integral key in the drive unit greatly complicates using an adapter (should be easier with a 1" bore drive unit; more space, room for integral key plus an additional crank key to engage). Most, if not all, of the Chinese TCs come with metric bolts, so you probably will need to replace the crank bolt and 4 plate mounting bolts with SAE bolts. Some people have forced the metric bolts into the aluminum side cover; don't do it; if you can't run the bolts in with your fingers, you need different bolts. With some modification to the mounting plate, it can be rotated to raise the driven and minimize the need to raise the engine (as seen in two threads linked below). Note that on the MM/212 bike, the top of the plate is even with the bottom of the exhaust flange, much higher than the typical installation (it's even higher on the CT100U, but that's a smaller engine). A TAV/TC is actually a CVT (Continuously Variable Transmission); low speed ratio is 2.70:1 (+/-) and high speed ratio is 0.90:1 (+/-) with infinite ratios in between. The CVT adds an additional reduction, similar to a jackshaft but variable in this case, which should provide improved take-off, acceleration, pulling power, etc.; it should improve low speed off-road performance, which seems to be you goal. Depending on your use, there's a possibility that you may still want a larger rear sprocket in addition to the CVT (minibike rock crawling anyone?), but I doubt that will be the case.

    https://www.oldminibikes.com/forum/m...n-ct100-2.html

    https://www.oldminibikes.com/forum/m...converter.html

    https://www.ombwarehouse.com/predato...converter.html

    "Auto Express return policy
    Returns are accepted for unused, undamaged items in original packaging within 7 days of of your order. Items returned per our policy will be refunded the cost of the item less the original cost of shipping and a 15% restocking fee. Buyer is responsible for shipping the item being returned. Please contact us if you have any questions or concerns!"
    "The difference between stupidity and genius is that genius has its limits." - Albert Einstein

  2. #22
    Raskin's Avatar
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    Check out this vid of a ct200u w a 60t sprocket installed.Keep in mind this engine has performance upgrades and governor bypass so in your case it wont be this fast also you can use the throttle limit screw to take some power out.also if you use red beard as a coupon code you will save 10% buying that gopowersports one https://youtu.be/syKMDlYXyDc
    Last edited by Raskin; Today at 09:59 AM.

  3. #23
    Junior Member
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    It is a 5/8 shaft, and I'm not going to replace the crank. I'm going to try one of these adapters, which I believe will work fine:

    https://www.ebay.com/itm/5-8-x-3-4-x...72.m2749.l2649

    I really don't want to butcher the frame, but I don't mind fabricating spacers or brackets.

    I'd like to keep the stock exhaust for now, too.

    Hopefully I can make it fit.

    David

  4. #24

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    You might have to make some 1" spacers to raise the engine. You can use 1" square tubing. You can also buy a 1" thick 4" x 7" piece of aluminum. Drill your 4 mounting holes and it will be stronger than the tubing spacers.
    Danford1
    https://www.ebay.com/itm/1-X-4-ALUMI...IAAOSwvg9Xb0p3
    Time is the best teacher. Unfortunately it kills all of its students.

 

 
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