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Thread: Homebrew Yamaha Thumper Conversion

  1. #16
    Join Date
    Jan 2014
    Location
    Prescott az
    --
    690

    Homebrew Yamaha Thumper Conversion

    Was gonna say run a tri z fender since it’s a Yamaha.


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    [/SIGPIC]
    85 350x
    83 200x-sold
    ×2 85 200x-sold
    06 kx250f-sold
    86 tecate-sold
    86 tri z powervalved
    85 BIG red
    18 rmz250
    87 lt80
    19 ttr110

  2. #17
    Join Date
    Jan 2009
    Location
    ohio
    --
    1,758
    Run what ever YOU think looks good it’s your build. OR What ever fits the frt end and works
    If its on the internet its got to be true they can't put any lie's on the internet

  3. #18
    Atc GuY's Avatar
    Atc GuY is offline At The Back Of The Pack Arm chair racerFirst time rider
    Join Date
    Oct 2007
    Location
    Michigan
    --
    238
    Decided on a white 350X fender. The yz numberplate matches the raised portions of the 350x fender profile the best (although not perfect) compared to the 250r fender. It’s also a hair less coverage than the 86-87 200x fender but not bad.

    Also picked up an oem yfz450 muffler as they’re made out of steel and a lot easier to cut and weld (for me) compared to something SS or Ti. The yfz 450 pipe has a few aggressive bends in it that I have to shorten up slightly but nothing crazy. It bolts up to the rear support fine, just needs to be tipped up in the front to look right. I will say the stock yfz muffler weighs a ton so I may have to see what all can be yanked out of the inside without raising too much suspicion for the authorities

    More to come soon hopefully!

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  4. #19
    Join Date
    Aug 2008
    Location
    devore,ca
    --
    1,014
    I did a very similar build 5 years ago, and that’s all I ride now. 13 inches of nice soft suspension and electric start make you spoiled real fast( I used a WR450 bike ).
    A couple things to consider are extending the axle 3” per side and big foot pegs from a quad. They made a big difference for me .
    YAMAHA 450 HYBRID
    85 350X- RED
    85 350x -BLACK
    86 350x-WHITE (with Goki)
    85 250r
    83 atc 70
    84 atc 70
    84 atc 110
    09 yfz 450
    2006 Arctic Cat Prowler
    RZR XP 900

  5. #20
    Atc GuY's Avatar
    Atc GuY is offline At The Back Of The Pack Arm chair racerFirst time rider
    Join Date
    Oct 2007
    Location
    Michigan
    --
    238
    Haven’t given up on this build! Next round of parts are on their way, will be machining up a custom front caliper bracket to attempt to stuff a single piston caliper up there for now. These triples are really narrow which makes getting a dual piston in there a really tight squeeze. Looks like a Yamaha ttr230 chain slider will fit the yfz arm with some light massaging, we update once it’s mounted. Also have a 90’s yz250 kicker in the mail which should be a few inches shorter than the yzf stuff and clear the rear fenders without a bunch of trimming

  6. #21
    Join Date
    Aug 2024
    Location
    Vietnam
    --
    1
    Thank you for the information you shared, hope you will share more useful information.
    giacongcokhi Tung Dung tham phi nho trong long, sau khi cam dua gap thuc an dua

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