Quick silly jetting question
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Thread: Quick silly jetting question

  1. #1
    Senior Member Dark Sol's Avatar
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    Quick silly jetting question

    Out of these two scenarios, which would result in Richer running bike? Assume humidity is at 50% for both of them.

    3000 foot Elevation, 50 degrees F
    Sea Level, 90 degrees F

    Which would be richer? By about how much? Just trying to get an idea of how much temperature affects jetting compared to elevation.
    2008 CRF230L

    2006 CBR1000RR

    2007 CB919 - 70k Miles and still runs like new!

    * 2001 TW200 (Sold after 15k miles of fun)

  2. #2
    Senior Member scotti158's Avatar
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    Try this. Air Density Calculator I didn't run the numbers but denser air would be leaner and less denser would be richer with the same jetting.
    SEADUB200 likes this.
    2013 Yamaha TW200

    1996 Yamaha TW200

    1995 Kawasaki KLR650

    2002 Yamaha RoadStar 1600 with sidecar

  3. #3
    Senior Member cpit's Avatar
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    The air at 3000ft @ 50F is less dense than 0ft @ 90F, so 3000ft @ 50F runs richer

    I can understand thermals, but I don't know enough about different jet sizes to tell you how much of a difference it'll make to your bike's performance.

    *Edit: This is assuming constant humidity, which won't necessarily be the case. If the higher altitude is less humid than the lower altitude, the difference between the two scenarios is smaller.
    Last edited by cpit; 04-06-2016 at 08:22 AM.
    TWilight, SEADUB200 and Xracer like this.

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  5. #4
    Senior Member scotti158's Avatar
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    Here are some more "calculators" for jetting. Interesting for some, intimdating to others. Calculators Or you could do what most of us do, just ride it.
    admiral likes this.
    2013 Yamaha TW200

    1996 Yamaha TW200

    1995 Kawasaki KLR650

    2002 Yamaha RoadStar 1600 with sidecar

  6. #5
    Senior Member kj7687's Avatar
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    Quick, silly answer: sell your bike and buy one with EFI.

    LOL, just kidding (mostly). I don't have a clue. This is why I refuse to ever touch the settings of a carburetor. Sure it can be improved, but it can also really be screwed up (and even "improvements" are likely to be detriments in certain circumstances - even just considering performance/optimization). I just leave them bone stock. I figure you won't have an optimally running bike in any given scenario, but you'll have a running bike in any given scenario.

    Also, how many miles do you currently have on the 919? 70k is pretty sweet.
    Last edited by kj7687; 04-07-2016 at 03:08 AM.
    saabbug likes this.
    KJ, just KJ, ok.


    Current rides:
    2004 GMC Sierra 1500, 1999 Toyota 4Runner

    Past rides: 2015 Yamaha XT 250, 1997 Suzuki DR 200, 2007 Honda Ruckus, 2007 Yamaha TW 200, 2007 Kawasaki Ninja 500, 2009 Kawasaki KLX331S; 1994 GMC Sierra 1500, 1987 Nissan Pathfinder, 1992 Acura Integra, 1986 Honda CRX, 1989 Jeep Cherokee, 1994 Chevrolet Astro Van, 1979 Volkswagen Rabbit, 1984 Jeep Cherokee

  7. #6
    Senior Member Xracer's Avatar
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    Quote Originally Posted by kj7687 View Post
    Quick, silly answer: sell your bike and buy one with EFI.

    LOL, just kidding (mostly). I don't have a clue. This is why I refuse to ever touch the settings of a carburetor. Sure it can be improved, but it can also really be screwed up (and even "improvements" are likely to be detriments in certain circumstances - even just considering performance/optimization). I just leave them bone stock. I figure you won't have an optimally running bike in any given scenario, but you'll have a running bike in any given scenario.

    Also, how many miles do you currently have on the 919? 70k is pretty sweet.
    Jeeezzzz K.J. Your a party pooper! Screwing around with things best left alone is part of the game.
    littletommy likes this.

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