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Thread: USD Forks

  1. #1
    Senior Member assquatch20's Avatar
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    USD Forks

    42708188_2086599044984386_988946581027815424_n.jpg

    So I found a parts bike with a kickstarter cheaper than the kit, aiming to pick it up this weekend. Looks like YZ80/85 forks though. I know the conventional ones have been discussed here but I'm curious if there would be any benefits to these inverted ones. Not sure how much travel they have or if the spring rates are enough, etc. I'm guessing it'd be limited in wheels and tires without lacing up something else to the hub, and without custom triples it's probably too narrow for a TW front tire.

    What say you folks? Let's hope the engine and/or kicker shaft and such are at least worth it.
    Sathump likes this.

  2. #2
    Senior Member TW-Brian's Avatar
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    Interesting find! As you pointed out, the only easy way to utilize these forks would be to swap the whole front end. This would give you a skinny front tire, but also a better (?) front disc brake. Could be a fair tradeoff.

    The rear wheel, swingarm and the engine parts (head, cylinder, output shaft, etc.) are always worth some money. Sounds like you made a good deal.
    Last edited by TW-Brian; 10-01-2018 at 04:32 PM.

  3. #3
    Senior Member Maxpower's Avatar
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    just because forks are inverted doesn't make them better.
    Although those forks are higher quality than stock forks. What size rim is that? It looks like a front end from a CR85 expert
    Last edited by Maxpower; 10-01-2018 at 07:37 PM.
    87 TW

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  5. #4
    Member Sathump's Avatar
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    you can lace an 19" rim and run 100 tire on it

  6. #5
    Senior Member PlacerLode's Avatar
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    any front fork from a YZ or WR Yamaha etc is probably a great upgrade
    "It's Like Warm Apple Pie"

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  7. #6
    Senior Member assquatch20's Avatar
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    Looking at the spring rates available for a later model YZ80, I think the stiffest available would be .33kg/mm which isn't very promising. I sort of expected as much, given what it's coming from. Just guessing but it looks like the 17" rim on it now, but yes, 19" wheels were also available. With around 10" of travel it might be nice in the woods at a mellow pace but probably a lot of pogo action at higher speeds or on the street.
    Smitty Blackstone likes this.

  8. #7
    Senior Member assquatch20's Avatar
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    Once I finally got some time to have a look, I measure the front tire, saw that it was actually a 21", and knew that AllBalls don't have a bearing for a bike like that to convert onto a TW200. Inspected the steering tube, saw upper bearings were too big to fit. Got a part number off a fork and find they're 43mm WP forks from a 2000-2002 KTM EXC 200. I'm very temped to have a bushing of some sort worked out so that I can use a conversion bearing of a common size, as the KTM bearing sizes are a little odd. It will be some time before I can get around to fooling with it, the way things are looking.

  9. #8
    Senior Member Badgerflorida's Avatar
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    They would definitely be an upgrade vs stock. Good luck with the conversion. Would really like to hear your thoughts when you get it sorted.
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  10. #9
    Senior Member Fred's Avatar
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    Better forks will make the TW much safer and confidence inspiring at speed off-road. The stock TW suspension seems the wall one runs into when pushing the TW hard before noticing the inadequacies in engine or brakes. The way Gerry built my Mr.Gizmo bike with Tri-Z forks allows it to sail through ruts and loft front over water bars with confidence. On the stock TW these situations require panic braking or result in fear of crashing if don't slow down in time.
    What a difference a few extra inches makes.
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    Senior Member Darth's Avatar
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    That's what she said!
    “It’s more fun to ride a slow bike fast, than a fast bike slow”.

    "The less horsepower a motorcycle has, the more it can teach you.” - Ben Bostrom

    And though a mountain may rise up and smack the livin' shit outta me,
    and wad up my bike somethin' awful...
    Still, I rise!
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