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Thread: Carb Jetting Chart

  1. #1
    Join Date
    Aug 2007
    Location
    Missouri
    Posts
    88

    Carb Jetting Chart

    Does anyone have this saved on thier computer somewhere or can tell me where to find it on the internet. I have been told by a couple people that mikuni has one out there on the net somewhere that is really good but I cant seem to find it. Just thought i would ask if someone had it and could direct me in the right direction. thanks

  2. #2
    Join Date
    Jan 2008
    Location
    Dallas
    Posts
    618
    This what you're looking for?

    Width------Keihin # -- DynoJets # -- Mikuni #
    0.0350---- 92.5--------- 92----------- 86.3
    0.0360---- 95----------- 94----------- 88.1
    0.0370---- 97.5--------- 96----------- 90.0
    0.0380---- 100---------- 98----------- 91.9
    0.0390---- 102.5------- 100---------- 93.8
    0.0400---- 105--------- 102---------- 95.6
    0.0410---- 107.5------- 104---------- 97.5
    0.0420---- 110--------- 106---------- 99.4
    0.0430---- 112.5------- 108--------- 101.3
    0.0440---- 115--------- 110--------- 103.1
    0.0450---- 117.5------- 112--------- 105.0
    0.0460---- 120--------- 114--------- 106.9
    0.0470---- 122.5------- 116--------- 108.8
    0.0480---- 125--------- 118--------- 110.6
    0.0490---- 127.5------- 120--------- 112.5
    0.0500---- 130--------- 122--------- 114.4
    0.0510---- 132.5------- 124--------- 116.3
    0.0520---- 135--------- 126--------- 118.1
    0.0530---- 137.5------- 128--------- 120.0
    0.0540---- 140--------- 130--------- 121.9
    0.0550---- 142.5------- 132--------- 123.8
    0.0560---- 145--------- 134--------- 125.6
    0.0570---- 147.5------- 136--------- 127.5
    0.0580---- 150--------- 138--------- 129.4
    0.0590---- 152.5------- 140--------- 131.3
    0.0600---- 155--------- 142--------- 133.1
    0.0610---- 157.5------- 144--------- 135.0
    0.0620---- 160--------- 146--------- 136.9
    0.0630---- 162.5------- 148--------- 138.8
    0.0640---- 165--------- 150--------- 140.6
    0.0650---- 167.5------- 152--------- 142.5
    0.0660---- 170--------- 154--------- 144.4
    0.0670---- 172.5------- 156--------- 146.3
    0.0680---- 175--------- 158--------- 148.1
    0.0690---- 177.5------- 160--------- 150.0
    0.0700---- 180--------- 162--------- 151.9
    0.0710---- 182.5------- 164--------- 153.8
    0.0720---- 185--------- 166--------- 155.6
    0.0730---- 187.5------- 168--------- 157.5
    0.0740---- 190--------- 170--------- 159.4
    0.0750---- 192.5------- 172--------- 161.3
    0.0760---- 195--------- 174--------- 163.1
    0.0770---- 197.5------- 176--------- 165.0
    0.0780---- 200--------- 178--------- 166.9
    0.0790---- 202.5------- 180--------- 168.8
    0.0800---- 205--------- 182--------- 170.6
    0.0810---- 207.5------- 184--------- 172.5
    0.0820---- 210--------- 186--------- 174.4
    0.0830---- 212.5------- 188--------- 176.3
    0.0840---- 215--------- 190--------- 178.1
    0.0850---- 217.5------- 192--------- 180.0
    0.0860---- 220--------- 194--------- 181.9
    0.0870---- 222.5------- 196--------- 183.7
    0.0880---- 225--------- 198--------- 185.6
    0.0890---- 227.5------- 200--------- 187.5

  3. #3
    Join Date
    Aug 2007
    Location
    Missouri
    Posts
    88
    no really looking for something like a troubleshooting guide. You know one that tells you if your getting this to check this type of thing. Thats good info right there though. Thanks

  4. #4
    Join Date
    May 2009
    Location
    New Jerey
    Posts
    32
    GOOD RULE OF THUMB

    Running rich can rob hp also. Check your spark plug color. Run the bike at idle then shut it off and check it (Pilot jet), hold the throttle to mid throttle for about 10 secs and shut it off instantly and check it (Needle position), then hold it WOT (preferably while riding it) and shut it off and cost to a stop (Main jet). Your plug reading should be a nice tan/brown looking color for the best performance on each check. It is time consuming but the best way to make sure your bike is dialed in CORRECTLY all throughout the powerband. Adjust your jets according to what your plug is telling you

    White plug needs more fuel ( bigger jet )
    Tan plug good ( adjustment needed )
    Black to much fuel ( smaller jet )
    "06" YFZ450 jet kit and zip tie mod, cam mod
    "06" Raptor 350 stock
    "06" predator 90 stock

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