Question about 2007 kawasaki KLX 250

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Big bore kit

Hi i own a 07 klx250 stock and was wondering how hard it would be to install the 300 kit myself
i have a bit of experience in motors but was looking for any diagrams or instructions if you can get them

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  • 83 Answers

The big bore kit is pretty easy. It is actually pretty basic. If you are buying a complete kit it should come with a spec sheet that will give you clearances and so forth. Make sure you gap the rings. I believe the gap should be .002" per inch of bore. If you are running a super hi-lift cam then you will want to check the piston to valve clearance and also the check for valve spring coil bind.
Good luck and let me know if you have any further questions.
Regards,
RSelvy

Posted on Dec 19, 2008

  • Rob Selvy
    Rob Selvy Dec 26, 2008

    It's not hard to DIY. Just make sure you check piston clearance and ring end gap when you install the kit. They are pretty much bolt on but you may want to install a better camshaft, ( I recommend Megacycle or a Web Cam), when doing so I would also recommend installing hi-performance valve springs.
    Let me know what type of diagrams you are looking for. I can send you a link to a parts manual if needed.
    Best of luck.
    Regards,
    RSelvy

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