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Thread: 2007 xb9sx knocking

  1. #1
    Junior Member
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    My bike is making a knocking sound and I was hoping someone can point me in the direction as to what it is, I was thinking maybe the timing is off or the plugs are bad. Anyone have any ideas? Thanks. Link to video http://youtu.be/Mc6yAOSbEro

  2. #2
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    Sounds like a rod to me. Check exhaust to make sure it's all tight first

  3. #3
    Senior Member squidbuellie's Avatar
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    Time for a new crank and rods.... Throw a magnet in the oil bag and I bet you'll find some silver fish.... Or drain the oil.

  4. #4
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    How many miles? Seen a few 07 xb9 fail now. Another went around 30k & 40k but I've seen xb9 way over 100k.

    My 08 had 29k (running fine) last time I did maintenance for the current owner.

    PS I have a good xb12 crank, ECM & intake if you want to convert to xb12 :)

    Let me know. It will be cheaper than new one or buying a used motor

  5. #5
    Senior Member Dellinger's Avatar
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    Sounds like my 08 XB12scg that had a rod bearing failure. I had to replace everything and I'm still putting it back together. Bearing race metal is like a sand blaster to the internals. I got a nib crank assy from surdyke for $536. new cams, lifters, pistons & barrels, oil pump internals, ect... the rebuild is over $2k... If you do rebuild, it will be a new engine. Just inspect everything when its apart and I recommend not starting it anymore because every second that engine is running it's nuking more parts. Good luck man...

  6. #6
    Senior Member
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    Damn lots of 07 xb9's are starting to have crank failures. This is really sad. Too bad there wasn't a recall of something.

    I've been wanting a stt bad but all I see are 07's for sale and the whole crank failure thing makes me stay away.

    Good luck man.... If it were me I'd try and grab a 06 or older engine and swap it in. If you get a 04-05 engine swap out the oil pump gear while the engine is out. I'd assume you could get a engine for around a grand.

    Oh and please add your Vin to the crank failure thread on badweb.

  7. #7
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    if it helps i have a complete good running xb9 engine sitting here waiting for someone to buy it....

  8. #8
    Junior Member
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    Jul 2014
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    I'm weighting my options as far as what to do with the bike, any opinions on how much i could get selling the bike as is? I also have a question why wasn't there ever a recall from this problem?

  9. #9
    Senior Member
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    because not enough of them fail.


    i think the 12's were more prone to failure.

    i had one but it was even more rare....crank was fine, but pinion shaft bearing started falling apart and tore up the outer race. i had .005" runout on pinion side and .004" on stator side.

    bearing rollers. my guess is either a sh1tty part, incorrect original tolerance, or the runout finally caught up to it..


    heres the race:



    i have only seen one other documented case like this and it was from Twin.

  10. #10
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    Superbikes of Dallas, Tx, has an XB9 engine sitting on a pallet with only 2k Miles on it. The mechanic said it ran before he removed it. He also did say that he was going to put it in a chopper, but he was thinking of selling for $1500.



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