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Project 1976 Yamaha YZ400

Discussion in '2 smokers' started by craydds, Feb 22, 2013.

  1. Scootern29

    Scootern29 Long timer

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    Sep 4, 2012
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    1,073
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    In the hot, hot, dezert
    The tank looks like it cleaned up pretty well. With that much fuel you may have to ride over to 29 Palms for an Anchor Steam. :rofl
  2. craydds

    craydds Long timer

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    Aug 3, 2010
    Oddometer:
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    Las Cruces, NM
    That is a groovy tank. Thanks, Scott! Get those Anchor Steams in the fridge, here I come. Gonna go out to the garage now and pull off the head and cylinder - time to inspect the bottom end. Yeah, I know it sounds bass-ackwards, but I wanted to get the bike back together and ride it, now gotta pull the motor out and rebuild it (most likely). There is an unmistakable knock-knock-knock at low rpm, sounds like rod/crank is ready to grenade.
    edit: Also, thanks for the tip on the air box. It should arrive soon, be a good time to install it with the motor out (I think). Will bug you for tips on air box installation.
  3. Scootern29

    Scootern29 Long timer

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    Just an FYI. I picked up a comlete gasket set from DC Plastics for $50. Very good quality and fit.

    www.dcvmx.com

    You will need to undo the shock and maybe take the rear wheel off to get the airbox in.
  4. piniongear

    piniongear Adventurer

    Joined:
    Dec 2, 2013
    Oddometer:
    12
    Location:
    Texas

    I just found this forum and have read the entire thread on restoring the YZ400.
    Now since I just joined the forum yesterday, and this is my first post, I assume I am not entitled to post pics yet.

    Anyway. I have a 1976 YZZ175 and after reading about the missing threads in his flywheel I removed the cover to look at mine.
    I am not missing any threads, but am missing a flywheel!

    Why did the 400 use a flywheel and the 175 just has a small rotor?
    Anyone know?
    pg
  5. stainlesscycle

    stainlesscycle Long timer

    Joined:
    Jun 6, 2008
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    2,329
    Location:
    morgantown, wv
    internal rotor flywheel on 76 yz175, makes for a more zippy motor. the 73-75 mx/yz250 (+ many more) also had internal rotor (but they aren't interchangeable with yours..) . fortunately there are tons of options/ways to switch it to external if you want.
  6. Scootern29

    Scootern29 Long timer

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    Oddometer:
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    Location:
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    I would take that 175 off your hands in a heartbeat. Interested in any trades? Depending where you are located?
  7. craydds

    craydds Long timer

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    Aug 3, 2010
    Oddometer:
    1,180
    Location:
    Las Cruces, NM
    Posting pics is a requirement. Otherwise, we will think you are just blowing smoke. :rofl
  8. MaicoMan490

    MaicoMan490 Poach it or Lose it

    Joined:
    Jul 22, 2012
    Oddometer:
    9
    Location:
    Vegas Baby !
    I have a IT 400, 4-Sale!!!
    Untouched Stock !:eek1
    Good Compression.
    Good Spark.
    Shifts good.
    Rear Shock is Good, No leaks !
    Just Needs a lil Love !:D
    1'st $500. $CASH$ Takes it Home ! ......Las Vegas, Nv.:1drink
    LarryStorm503@Gmail.Com

    [​IMG]
    [​IMG]
  9. craydds

    craydds Long timer

    Joined:
    Aug 3, 2010
    Oddometer:
    1,180
    Location:
    Las Cruces, NM
    Got my motor rebuilt by a local 2-stroke guru. All back together again, fired it up yesterday and went for a short test ride. Did some adjustments and tightened up bolts. Will take it out this weekend for a long desert ride. Pics to come.
  10. athomerecords25

    athomerecords25 Banned

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    Apr 15, 2012
    Oddometer:
    146
    Location:
    Oakley, CA
    What a great thread.
  11. craydds

    craydds Long timer

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    Thanks!