82 Yz490 ??

Discussion in 'Vintage Bikes / Racing Forum' started by mkpack77, Jan 4, 2009.



  1. mkpack77

    mkpack77 Rookie DRN Member

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    I currently have an 82 yz490 that runs like a champ. I've read a lot of neg. about the bike, but it's a beast and I love it. I'm also about to get an 84 yz490 that I need to build. My questions are: what is the difference, if any, between the 82 and 84 and I've noticed in articles about different models, i.e. j,k etc...how do I tell what model yz490 I have??

  2. mkpack77

    mkpack77 Rookie DRN Member

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    Also, does anyone know where I can get a new or good condition throttle assy. for my 82 yz490???
  3. XRpredator

    XRpredator AssClown SuperPowers Damn Yankees

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    if you've got a 490 running right, I'd do all I can to not change a thing on it!
  4. zoommx

    zoommx Subscriber

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    82: exhaust comes up on chain side; shock resevior is long and gold, on right side of front frame tube; 6 stud head
    84: is the last year of front drum brake and the exhaust comes up on brake side; 7 stud head

    The main performance differences are the rear suspension on the 82 had a little more weight and friction than the more modern looking 84. The 84 has a 2mm larger carburator and the cylinder has seven ports instead of five.
  5. mkpack77

    mkpack77 Rookie DRN Member

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    thanks, thats the info I was looking for. What about the model designator?
  6. Beuford

    Beuford Rookie DRN Member

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  7. midlifemoto

    midlifemoto Rookie DRN Member

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    the 84 had a 4 speed which I hated, but it was scary fast
  8. zoommx

    zoommx Subscriber

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    I don't think the vinumbering system applied to dirtbikes until 84. The uniform 17 digit VINumbering did start in 80 though. Here's a good decoding that will apply to all those: http://www.amsoil.com/lit/g3000/2008/sections/VINNumberCodePage.pdf
    I changed my 82 to a 5 speed from an IT transmission. For MX, I believe the 4 speed trans would be fine.
  9. OriginalRider

    OriginalRider Rookie DRN Member

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    The 82 yz490 weighed 19 pounds more then the 84 yz490.
  10. Bob1972

    Bob1972 Rookie DRN Member

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    Hi
    The frame number contains the letter referring to the year eg. J=1982 I can't remember what position the letter is in the number it may be the last one.
    Hope this helps
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