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jetting database

This is a discussion on jetting database within the ZR-7 Performance Upgrades forums, part of the Kawasaki ZR-7 category; Exhaust--------------------------------Stock modified airbox-----------------------Stock, I may have removed the white silencer, cant remember K&N filter-------------------------------YES Pilot Jet---------------------------------38's (35's were stock) Main Jet---------------------------------Stock (size ???????) Shim / ...

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  1. #16
    SPAM Cop Persimmon_Seven's Avatar
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    Exhaust--------------------------------Stock
    modified airbox-----------------------Stock, I may have removed the white silencer, cant remember
    K&N filter-------------------------------YES
    Pilot Jet---------------------------------38's (35's were stock)
    Main Jet---------------------------------Stock (size ???????)
    Shim / or clip---------------------------NO
    Jet ket-----------------------------------NO
    elevation (if you know it)------------S.F. Bay Area, CA. 100-200 ft ???




    My gas milage went down when I put the 38's in and didn't notice any improvment. I liked the stock 35's better. the bike started easier with the 35's

  2. #17
    Supreme Being Pete's Avatar
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    Quote Originally Posted by SureThing
    We get so many questions on this, and when I first started looking a few months back I had a hard time finding what I was looking for. So I decided to start a Jetting database.
    Any other suggestions
    SureThing Are you going to provide links to the jetting database to share this info?

    Pete

  3. #18
    Gold Member/Community Dad Berto's Avatar
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    Quote Originally Posted by Pete
    SureThing Are you going to provide links to the jetting database to share this info?

    Pete
    Think he bought another bike and haven't heard from him in a long time. It's not good to make promises we can't keep.

    Speaking of projects, how is that LED replacement documentation (and Pics) coming along?
    Berto
    ZR7OA Member#: 229

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  5. #19
    Newbie vpur's Avatar
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    Jetting Database

    Muffler Stock
    Air Filter K&N
    Jet Kit- Factory Pro
    #38
    #102
    2 spacers on top of
    #2 clip
    Float Settings - Factory
    idle screw 1.5 turns out
    Elevation 2800ft
    humidity - dry

    Advance ignition time 4*

    Runs well maybe a bit rich, but lots of power mid to high rpms.

  6. #20
    Up-And Comer Doug's Avatar
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    2001 ZR-7S

    All stock except #38 pilots. Idle mixture screws set to 1.75. Elevation around 500'

    Runs great, no hesitation.

    Before I went into the carbs, the bike ran like a piece of $#%@ or I should say barely ran at all. I found the back half of the airbox was not seated properly at the tabs on the bottom. Also, one of the carb floats was about 4mm off, one of the carb slide diaphragms was not seated properly in the groove at the top of the carb, and the main jets were bunged up by the previous owner's failed attempt at rejetting.

    I carefully reset the float heights to stock 17mm, put in new stock main jets along with #38 pilots, and made sure that everything was installed properly. HUGE difference.
    Last edited by Doug; 04-24-07 at 08:12 PM.

  7. #21
    Rising Star tnichols's Avatar
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    2001 ZR-7S - Pilot Jet change only (#38)

    Air Filter: .............Stock
    Airbox: ................Stock
    Elevation: ............0 - 500 feet
    Exhaust: ..............Stock
    Main Jet: .............Stock #108
    Pilot Jet: .............#38 (Stock was #35)
    Shim / clip Setting: Stock
    Slow Speed Mixture: Stock (Still Factory Pluged.)

    Comments: The only change was installing larger pilot jets. Runs much better now. Easy fix and and no adjustments to make or screw up. If you don't want to spend the money, you might be able to accomplish the same thing by opening your mixture screws or sanding down your needle just a bit. There is some overlap in the jeting circuts. I average about 54 mpg...(using the stock odometer, but who knows how accurate that is?) Bike is a little harder to start and there is still a slight flat spot just off idle. I will probably go back and open up the the mixture screw.

    Just a side note. Always do one carb at a time. Some parts look the same, but are not interchangable. For example: The main jet holders look the same, but they are different. The outer carb main jet holders have 7 pairs of holes. But the inner carb main jet holders have 9 pairs of holes.

    Good luck...
    Last edited by tnichols; 06-27-11 at 08:36 PM.
    2001 Kawasaki ZR-7S (ZR750H)
    - Current mileage is 20,800 miles
    - Custom Mustang Seat
    - GIVI bags E36/E45/E36
    - Garmin 2610 GPS
    - Harley Back Rest
    - Shinko 009 RAVEN RADIAL Tires
    - Stock Air Cleaner, Exhaust, Gearing
    - Zero Gravity Windscreen
    - @ 08,750 miles replaced rear BT020 tire
    - @ 17,500 miles replaced front BT020 tire
    - @ 20,000 miles replaced rear brakes
    - Pennsylvania, USA
    - My Web Site: http://tomstoys.50webs.com/

  8. #22
    Up-And Comer Doug's Avatar
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    Ethanol Gas Runs Leaner!

    The "new" blended gasoline with 10% ethanol that we are now getting in the Northeast (and presumably just about everywhere else) runs leaner than the MTBE blended gas from the last few years. The ideal mixture ratio for 10% ethanol gasoline is about 4% less air than pure gasoline and 2% less air than 15% MTBE gasoline. In other words, if you bike ran best at 13:1 last year, it's now going to run best at between 12.5:1 to 12.8:1. Not a big difference, but you notice it on the road.

    My Previous ZR-7's ran great with just a #38 pilot jet change, but now the current bike is still taking a loooong time to warm up even after the pilot jet change. It still runs great when warm, but with the exact same settings slightly leaner than the last one which I owned 2 years ago.

    You can get #38 pilot jets from your Kawi dealer, they are the stock ones from a Ninja 250

    Ethanol blended gas also has implications for storage (boat owners are more aware of this) because the ethanol is hygroscopic. It will absorb water until the ethanol is saturated and the ethanol/water mixture phase separates from the remainder of the gasoline. Since ethanol is 100 octane at US measurement standards, the remainder of the gasoline will be very low octane and can cause engine damage. The bike may or may not run at all on the ethanol/water layer at the bottom of the tank, and the tank will be subject to greatly increased corrosion.

    I'm putting stabilized unleaded racing fuel into my bikes for winter storage.
    Last edited by Doug; 08-26-06 at 05:01 AM.

  9. #23
    SPAM Cop Persimmon_Seven's Avatar
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    Quote Originally Posted by Doug
    The "new" blended gasoline with 10% ethanol that we are now getting in the Northeast (and presumably just about everywhere else)


    I'm putting stabilized unleaded racing fuel into my bikes for winter storage.

    We have E10 all year long. I get 10% less milage with that crap. My guess is this winter it will get to E15 or E20 (15%-20%).


    I will most likely drain the fuel tank and fuel bowls and put some motor oil in the tank and slosh it around, like the Kawasaki manual says.
    2000 ZR-7 w/26k - K.I.A.
    2001 ZR-7S w/89k - K.I.A.
    2001 KLR650 w/47k

  10. #24
    Up-And Comer WYOZR7's Avatar
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    Exhaust: Viper Can, Stock Headpipe
    Airbox: 20 3/8 inch holes, per Ivans instructions
    Air Filter: Stock
    Jet Kit: Ivans
    Main Jets: 105
    Pilot Jets: 35 (stock)
    Clip Position: #1 One shim below, 2 above
    Elevation: 4000+ ft
    2003 ZR-7S
    Givi Monokey Cases
    Viper Can
    Ivan's Jet Kit and Air Box Mods
    Throttlemeister
    Brake Light Flasher

  11. #25
    Up-And Comer BackStreet's Avatar
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    Exhaust: Stock with 32mm hole drilled in the baffel (up the tail pipe)
    Airbox: Stock
    Air Filter: K&N
    Pilot Jet: Stock #35
    Main Jet: Stock #108
    Shim / clip Setting: Stock
    Slow Speed Mixture: 1 full turn out from stock position (about 2.75)
    Elevation: 200 feet

    Runs OK with some hesitation. Full stock was pretty smooth so I just turned the pilots out one turn.

    Used Stabil over last winter and it started but did not run well till I got new gas. I start the bike once a month to replace the fuel in the float bowls and charge the battery.

    I run 1/2 a bottle of injector cleaner through once a year and use the best gas I can find - usually Shell V-Power. Bike runs crappy with the cleaner in but seems better once it's burned out.

    That's my routine. Plus I push it up to redline after a few miles each ride!
    1975 KZ900B
    2001 ZR-7S
    2003 Blackbird

  12. #26
    Rising Star pkovo's Avatar
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    Exhaust: Stock
    Airbox: Stock
    Air Filter: stock
    Pilot Jet: Stock jets,
    Main Jet: Stock
    Shim / clip Setting: 1 -.5mm washer on each needle
    Slow Speed Mixture: 2.5 turns out from seated
    Elevation: not much, approx 0-500'

    I'm now at 3.5 turns out on the screws. Tried many settings out to 4 turns and this feels the best. Still a tad of off idle hesitation, but only a very small bit. I think I'm kind of critical about it as it really is very minor. Bike runs great through all RPMs. I still haven't put the 38s in and at this point am starting to doubt that I will.
    Last edited by pkovo; 10-21-07 at 08:22 AM. Reason: changed jetting a little

  13. #27
    Newbie zlMark's Avatar
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    Quote Originally Posted by pkovo
    I suspect the main is too big though. Wide open feels a little rich. If I go wide open, then back of slightly from wide open, it feels quicker just shy of wide open. Since I'm rarely ever wide open, I don't notice it so I will just leave it alone.
    You have it backwards, your too lean.
    Thanks,

    zlMark
    85 ZL900 Black
    JKAZL2A17FB503100
    www.zl-oa.com

  14. #28
    Newbie zlMark's Avatar
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    Here is some specs and a dyno shot. This is from my friend Adams bike, thought you all would enjoy the info. Please comment

    Full Muzzy 4 into 1
    Uni Foam pods
    DJ 126 main
    #38 pilots
    4th groove on the needles
    3 turns out
    No advancer plate

    Thanks,

    zlMark
    85 ZL900 Black
    JKAZL2A17FB503100
    www.zl-oa.com

  15. #29
    Rising Star FlaZR-7s's Avatar
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    Quote Originally Posted by SureThing
    Exhaust Full Muzzy
    modified airbox None
    K&N filter Uni-pods
    Pilot Jet 35's and 2.5 turn out
    Main Jet 112's
    Shim / or clip 3 clip from top, 3 shims over
    Jet ket Ivan's needles only
    elevation (if you know it) Sea Level

    Any other suggestions

    Runs real good

    ZR7OA Member#: 1610
    2001 ZRX1200
    2003 ZR-7s

    Full Muzzy w/ Ivan's needles, Spiegles front brake lines.
    Galfer Wavy Rotors and pads.
    Progressive Fork springs, Vortex gas cap
    Zero Gravity Sport Screen, Hugger

  16. #30
    Rising Star isis's Avatar
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    Exhaust: Jardine Street
    modified airbox: About 36 holes around sides and back of box
    Air Filter: K&N filter
    Pilot Jet stock: 35's
    Idle screws: 2.5 turn out
    Main Jet: 135's
    Needles: 4 #4 washers shimming re-shaped stock needles
    elevation (if you know it) 900 ft
    4* Ignition Advance Plate
    Last edited by isis; 06-25-09 at 08:11 AM.
    jk
    ZR7OA #1095

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