87 Jetting
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Thread: 87 Jetting

  1. #1
    Senior Member Maxpower's Avatar
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    Feb 2017
    Waretown NJ

    87 Jetting

    I know it has to be covered already. Couldnt find it in the search.
    I would like to find the final word on jet sizes and where to buy them.
    It's the most cold blooded bike I've ever owned
    87 TW

  2. #2
    Senior Member elime's Avatar
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    Jul 2010
    San Jose, CA
    If you haven't done it yet, open the idle mixture screw to 2 1/2 turns. That did wonders for my TW.
    Purple, Badgerflorida and bad luck like this.
    Long live the internal combustion engine!

  3. #3
    Member BuddyMack's Avatar
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    Jul 2016
    Huntsville, Alabama, USA
    Are you saying you have a 87 TW that has not ever been rejetted?

    Sent from my LG-TP260 using Tapatalk
    Now Hidden Content on my 2nd TW - 2002 TW200 33k miles - 130 main 34 pilot - 244 Golden Boy Front - 34 BS rear - ATV Bar - New Rally Perches, Master Cylinder, and levers. This one may take a bit to whip into shape but we'll get there!

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  5. #4
    Super Moderator Purple's Avatar
    Join Date
    Mar 2015
    Ynys Môn
    No reason the re-jet an '87 - unless you want it to be a bit "perkier" - Yamaha had it about right to begin with (although there is some room for "play")

    Regarding Elime's suggestion, this is doubtless in response to the OP saying "cold blooded", which most TW’s are straight from the factory. If you look at the bottom of the carb (loosen both boots and try turning it), you should see a “brass blank”, indicating that the idle jet has never been messed with. Yamaha, in order to get these bikes past ever stricter emission tests, used to set them up to be incredibly lean from new. We have found the idle jet to be set from all the way in, to one turn out, resulting in a cold blooded engine that wouldn’t respond to any throttle until it had warmed up a bit — which is fine if you like waiting for ten or fifteen minutes before riding

    The solution is fairly easy — drill a small hole in that brass blank, insert (very gently) a “dry wall screw” to get some traction on it, and prise it out. This should reveal the idle jet. Screw the idle jet all the way in (carefully remembering how many turns it takes), then back it out two and a half turns — most of us find this setting to quite sufficient. Return the carb to vertical, and re-tighten the boots

    You may find your starting procedure has changed with regards using the choke, as the bike will now start and respond faster

    There are some pictures around here somewhere — but they should look something like this (right click, and "open in new tab" for enlarged view) …..

    carbbottomwithplug.jpg Capture.JPG

    If this is not the problem you have — post again and we’ll try to help you out some more ….
    Badgerflorida and bad luck like this.
    (Warning - Forum may contain nuts) ...... Hidden Content

    TW200 - 1998 - Japanese import - 7000 miles on the clock - TW225 Special Edition 2007
    - Hidden Content

  6. #5
    Senior Member Darth's Avatar
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    Nov 2013
    Timbercreek Canyon, Texas
    Thanks Purple.
    And special thanks (again) to jbfla for the terrific carb pics...so helpful!
    Purple and jbfla like this.
    "Faster, faster, faster, until the thrill of speed overcomes the fear of death."
    - Hunter S. Thompson

    “It’s more fun to ride a slow bike fast, than a fast bike slow”.

    "The less horsepower a motorcycle has, the more it can teach you.” - Ben Bostrom

    And though a mountain may rise up and smack the livin' shit outta me,
    and wad up my bike somethin' awful...
    Still, I rise!
    (With apologies to Maya Angelou)

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    - C. M. Howe, Jr.

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  7. #6
    Senior Member Maxpower's Avatar
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    Feb 2017
    Waretown NJ
    thank you for your help
    Purple likes this.
    87 TW

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