Idea to enable an engine swap...missile kit?
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Thread: Idea to enable an engine swap...missile kit?

  1. #1
    Senior Member Trail Woman's Avatar
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    Idea to enable an engine swap...missile kit?

    So I read that those who'd like to swap their motor for a XT or TTR were out of luck unless they could resolve the issue of the drive shaft not being long enough....I wonder if a missile kit might solve this. The swing arm in the kit has two sprockets built in to transfer the drive train around a wider back tire.

    I looked around and had no luck looking for a missile kit. IIRC they were discontinued after trikes became less popular but some small runs were released later...Missile kit bikes are too cool.

  2. #2
    Senior Member CJ7Pilot's Avatar
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    That's interesting! I've never heard of it before.

    Missile kit 1.jpg

    Missile kit 2.jpg

    I think the BW350 used a similar system:

    Missile kit 3.jpg
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    Senior Member Badgerflorida's Avatar
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    That is a great idea. And they are waaaay cool. If you can find one. Any idea how much they sold those kits for?
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    Senior Member Fred's Avatar
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    There were various jack shaft kits back in the 70's that were of a bolt-on, or weld-on home installation that accomplished the same goal. A complete assembly like the Missile Kit for the TW would be a rare find. However since the technology never swept the aftermarket, or custom bike industries there likely were reliability other issues. Too bad.
    Youtube has lots of jack shaft related videos for "How-To" inspirational guides to custom build your own,.. just need some pillow blocks and bearings, some shaft, a few sprockets, some chain and a whole lot of attention to detail while welding.
    Last edited by Fred; 12-20-2017 at 06:54 PM.
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    Senior Member Trail Woman's Avatar
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    Quote Originally Posted by CJ7Pilot View Post
    That's interesting! I've never heard of it before.

    Missile kit 1.jpg

    Missile kit 2.jpg

    I think the BW350 used a similar system:

    Missile kit 3.jpg
    Yeah that's the swing arm there. I've never noticed it on the BW...cool. I could be way off but it seems like it's worth looking into.

    There are some really cool/crazy missile kit fat bikes out there...Once I came across a 650cc. I find it hard enough not to drift off dirt roads on turns with a stock tw but a 250cc would be awesome.

    I couldn't guess at the price of one of these kits if you could find one....more incentive to learn how to weld.
    Last edited by Trail Woman; 12-20-2017 at 07:03 PM.

  7. #6
    Senior Member PlacerLode's Avatar
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    It's not terribly hard to add the extended output shaft I remember TWBrian seemed to have a line one somebody who modified TW shafts with an extra groove or two to allow them to work but Bill in Gold Beach OR has designed an output shaft extension that works great and doesn't require taking the motor apart

    Missile kits were never cheap and now a collectors item plus as an owner of a dozen Big Wheels I don't want the beach ball back tire or a jack shaft to have to deal with the extra weight and maintenance issues etc involved with it

    Look at TWBrians 2007 TW with the new Duro II and Trailer wheel and I think you'll see the perfect TW IMO anyway

    I'll stick with the spoked rim and a 2" extension on my swingarm and I think it will work very well and keeping the "TW Look" so to speaK"
    Heres a YZ426 with a custom missile kit (I really need to sell this it's way too crazy for my riding desires) instead of a trailer wheel it uses a standard ATV wheel and tire
    SAM_6045.JPGSAM_6054.JPG
    Last edited by PlacerLode; 12-20-2017 at 07:40 PM.
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    Senior Member Badgerflorida's Avatar
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    I bet it’s virtually impossible to keep the front tire on the ground with all the power and rubber on that YZ. Placer where do you find all these cool bikes?
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  9. #8
    Senior Member PlacerLode's Avatar
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    Quote Originally Posted by Badgerflorida View Post
    I bet it’s virtually impossible to keep the front tire on the ground with all the power and rubber on that YZ. Placer where do you find all these cool bikes?
    Yah I won't ride it I watched the guy who built it ride it unicycle style all the way down his block and back and that was enough test ride for me lol

    comes with matching sand tires too
    SAM_6813.JPG

    RE using BW swing arms on a TW I think it's possible I've done some preliminary measuring and both the BW200 and BW350 parts could work

    The catch is why not just buy a BW and add a Tri-Z disc front end and you'll have a very strong machine they have a frame design thats probably 10 times stronger than the TW in the rear section

    BW350's had the monoshock the BW200 uses twin shocks so you would need to reinforce a mount for the shock
    Last edited by PlacerLode; 12-20-2017 at 08:29 PM.
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    Senior Member TW-Brian's Avatar
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    Quote Originally Posted by PlacerLode View Post
    I didn't realize that you ended up with this bike.

    Add a lighting kit, an electric starter, a kickstand and a California plate, and I would be interested in it !

  11. #10
    Senior Member Heli-Mech's Avatar
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    Quote Originally Posted by PlacerLode View Post
    Could you share a few more pictures of the triple clamps and front axle/brake wheel set up ....... I would love to adapt a front fat tire to my WR forked TW!
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