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XJ1200 Big Bore kit....

Discussion in 'XJ Modifications' started by mikeames, Aug 4, 2012.

  1. mikeames

    mikeames Member

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    Anyone tried one of these?

    Ebay Big Bore Kit

    Any luck, thoughts, experiences with this kit? Price looks attractive. Other than re-jetting I wonder what other mods would have to be done?
     
    mikeames, Aug 4, 2012
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  2. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    This would require the cylinders to be bored to a new size obviously. The only thing I would be concerned about would be balancing the crank so the extra weight of the new pistons would not cause vibration.

    MN
     
    MN-Maxims, Aug 4, 2012
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  3. mikeames

    mikeames Member

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    Kind of surprised no one on here has done one of these...
     
    mikeames, Aug 6, 2012
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  4. MercuryMan

    MercuryMan Active Member

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    It's expensive unless you have access to a machine shop and can work the boring machine yourself. I agree with MN once you've done it you will have additional machine work to make it solid-it isn't a serious gain in power for the cost-Plus when was the last time someone complained about an 1100 being too mild. ;-) Just do a nice clean up of the existing mill, with a hone and new rings, lap the valves, add better coils, and make it pretty all for less.
     
    MercuryMan, Aug 7, 2012
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  5. kjohnson

    kjohnson Member

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    There are a few on the XS11.com forums that have done this to their 1100's. Most claim that the difference is substantial, be it due to the bike needing that kind of work or it just responds nicely. None have mentioned that there was any need of anything other than boring the cylinders.

    As for cost, I don't know if boring motorcycle jugs requires more/less/different equipment, but the local machine shop charges $25/hole. You just have to not mind them being a bit slow most of the time.

    If I didn't have to save for school in the spring and having the wife off to probably be permanent stay at home mom, I'd be buying them.
     
    kjohnson, Aug 15, 2012
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  6. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    Balancing the assembly would be a nice touch, but a smart guy could easily match the piston weight, or even polish the rods to gain some advantage, to help balance it. Tapering the inner bore of the wrist pin is another trick to lose a gram or 3.
     
    TIMEtoRIDE, Aug 16, 2012
    #6
  7. Orange-n-Black

    Orange-n-Black Well-Known Member

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    You might could get by without the weight balance if you were only increasing to 50cc's. 100cc's would be a completely different story. The strain would be like a 16 year old buying a grandma's car and expecting it to last long driving everyday at 100mph.
     
    Orange-n-Black, Aug 16, 2012
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