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Thread: swapping primary gears xb12 to xb9

  1. #11
    Junior Member
    Join Date
    Nov 2012
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    6
    I just bought a 2009 Ulyesses and it has this mod. Great for this bike! I also have a 2009 fire bolt witch it would be a good mod for but I like my top end on that bike. I'm looking into a 90ci kit for the fire bolt and possibly get the heads ported. It would be crazy with the lower primary gearing. It's a sacrifice and gain, just have to decide what you want.

  2. #12
    Senior Member konarider94's Avatar
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    Sep 2009
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    4,398
    Yes I have done this mod as well. Its a very noticeable change and makes the bike feel a lot more powerful. If you press the sprocket out of the rotor be sure to buy new hardware for installing the new sprocket on the rotor. They come from the dealer with loctite already applied to the bolts.

  3. #13
    Senior Member
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    Nov 2010
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    113
    This may be a dumb question, but I've always wondered. Has anyone ever gone the other direction and put an 12 primary in a 9? I've assumed this would lower the RPMs on the expressway when going 80 but would obviously hurt any low grunt that the 9 has. Again, I've always wondered so I thought I'd take this opportunity to throw it out there.

  4. #14

    Holy Smokes! I ordered a drive gear chain and stator rotor this weekend. These were used off an xb9... I thought I'd give this a go and see if the improvement was worth the effort. Having the rotor already attached made for a quick swap without worrying about damaging the rotor pressing the gear in and out.
    As for performance... This is the heat! The front end is weightless now. All other mods (exhaust, race maps, open airbox) are a joke compaired to this. This project cost under 100.00. The bike is nasty now. It tears through the gears as fast as I can shift. Loads of eyeball flattening accellertion. Fifth gear is wide awake now. Less vibration and a whole lot more grunt. Awesome! As for top end... Not sure the engine cold've worked all the way to redline anyway. This mod will get it to redline quickly.
    Thanks for the info.
    Dave

  5. #15
    Senior Member 50dro's Avatar
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    Apr 2009
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  6. #16
    Senior Member
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    Aug 2012
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    272
    definitely worth it! makes the bike a wheelie machine :D

  7. #17
    Senior Member
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    May 2014
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    172
    Any suggestions as to where to pick up the xb 9 parts? Looks like a great mod

  8. #18
    Senior Member
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    Aug 2012
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    272
    Just keep an eye out or you can pony up and buy from ASB

  9. #19
    Senior Member
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    Dec 2011
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    211
    Just missed this one.

    Ebay

  10. #20
    Senior Member
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    Feb 2013
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    Maryland
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    1,349
    Yes 12 primary on the 9 puts it around 150 mph (extra 500-700rpm equates to about 12mph as each 1000rpm= 20mph on stock belt xb12 primary) ((1:1 ratio)) but there's a catch. you need 90ish + hp to get there which means at minimum head work & custom tune.

    Remember switching ratios on a chain drive bike can also move the speeds around



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