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Thread: Will a Yamaha Tri Mo YT175 head/piston/cylinder bolt on a YT125 with no modification?

  1. 05-04-2010, 09:27 PM #1
    pandphomealone2
    pandphomealone2 is offline New to the board Arm chair racerNew to the board
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    Will a Yamaha Tri Mo YT175 head/piston/cylinder bolt on a YT125 with no modification?

    I have a 125 that runs good, but it needs the top end refreshed.
    I may convert it to a 175.
    Is it a simple swap, or is there machine work needed?
    Any info/tuning advise would help.
    Thank you
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  2. 05-04-2010, 09:33 PM #2
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    Louis Mielke
    Louis Mielke is offline The purveyor of "Plan B" Teaching quads a lesson
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    You need the 175 pipe to use the 175 topend but otherwise it will swap the cylinder, head, and piston, no problem.
    And that's the rest of the story. ~ Paul Harvey

    "Yes its broken, but does that really surprise you?."
    "What happened? What does it look like happened?!?!"
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  3. 05-05-2010, 07:32 PM #3
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    Vealmonkey
    Vealmonkey is offline Power User The day begins with 3WW
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    The yt175 uses a larger fuel tank. The yt175 uses a vaccuum operated fuel pump. You may want to pick those up as well.
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  4. 05-05-2010, 09:28 PM #4
    pandphomealone2
    pandphomealone2 is offline New to the board Arm chair racerNew to the board
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    Thank you for all the info!
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