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Thread: Re-sleeve or big bore a yz 250 2 stroke?

  1. #1
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    Re-sleeve or big bore a yz 250 2 stroke?

    Upon inspection of my YZ 250 cylinder I noticed a scratch from top to bottom of cylinder wall, it is through the coating. Should I re-sleeve or send off for a 285 big bore kit from Max Power? Thanks


    Clint Cook
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    AHSCS
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  2. #2
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    If the cylinder already has a sleeve in it I guess it's up to you as to whether you want to go big bore (and go through re-jetting) or stay standard.

    If it's a coated cylinder, you can have it repaired and re-coated (and stay standard size) or go big bore and have it re-coated.

    I've used Millenium Technoliogies to re-coat: http://www.mt-llc.com/
    2000 KDX 200 w/ Revloc Dyna Ring - CR250 forks coming soon....
    2002 CR 250 w/ Rekluse Z Start Pro a lots of other things to make it a "woods weapon".
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  3. The Following User Says Thank You to David_L6 For This Useful Post:

    CCC (01-03-2011)

  4. #3
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    The cylinder is still stock. I was trying to weight out the high cost of repair vs. high cost of the 285 kit. Do you reckon there are disadvantages to large bore sizes? I am pretty sure the safest bet is stay stock but I keep reading about people turning KTM 250's into 300's and bragging about the usable power. Im on the fence, any feed-back would be great. Thanks!
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    When I was facing the same thing last year with a CR250, I had the cylinder re-plated and stayed stock size. I've never had a big bore done but from what I've read you will need to have the cylinder ported ($) and re-jet (time). I didn't want to spend the money and time to gain just a little displacement (only 15 CCs on an '03 CR250).
    2000 KDX 200 w/ Revloc Dyna Ring - CR250 forks coming soon....
    2002 CR 250 w/ Rekluse Z Start Pro a lots of other things to make it a "woods weapon".
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    Thanks again! I closed my eyes an made my decision, sent my cylinder off to Power Seal USA for a 290 kit! (kinda sketchy) It will take 3 weeks ! Hey David_L6 do you race the LACC? Cool well Thanks!

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  7. #6
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    Quote Originally Posted by CCC View Post
    Hey David_L6 do you race the LACC? Cool well Thanks!

    B-VET #333
    My son races the LACC series. I don't.
    2000 KDX 200 w/ Revloc Dyna Ring - CR250 forks coming soon....
    2002 CR 250 w/ Rekluse Z Start Pro a lots of other things to make it a "woods weapon".
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    It would be great if you could respond after you have had a chance to give your new YZ290 a good flogging.
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    You WILL be happy !

    Jeff
    GasGas300
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