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Project Bought a ZXR250C.

Discussion in 'Your 250cc Projects' started by Linkin, Jan 30, 2017.

  1. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    Unknown, but nearly 70k KM's on the frame. I have done about 15k KM on the engine since I bought the bike.

    I'm glad I didn't wait any longer to get stuck into it.
     
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  2. risky

    risky risky

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    light hone may be needed and ring gap should be in line with the little end gudgeon pin and no end gaps directly in line.
     
  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Yes, light hone and flog the ring piece out of it when you get it running. None of that running it in nonsense.
     
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  4. Andych

    Andych Well-Known Member Premium Member

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    Those bores look to be fine.. measurements will confirm or tell you how bad they are.. but if you cant feel a lip at the top then you should be pretty right.. the exhaust ports are an entirely different matter..lol
    It will be interesting to see how the CT18 works on that carbon buildup..
     
  5. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

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    Where will you source new springs from?
     
  6. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

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    Also, check the manual when you're putting the rings on the pistons...the old 120 degree rule doesn't apply.
     
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  7. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    Threebond them ! :D

    piston.JPG

    piston 2.JPG
     
  8. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    Head soaked overnight again, changed the water this morning and at lunch time. Did it one last time after I finished work for the day and let it soak while hot, as I was cleaning up the valves on the wire wheel.

    The water turned black after I came back and scrubbed the the ports with a stiff brush

    qDFzu2U.jpg

    Drained it out and there was a lot of chunky carbon floating around

    mCZ5w9x.jpg

    Ports are starting to look a bit better, I can see alloy in a few places :)

    QZ9gMvS.jpg

    vmnJTCB.jpg

    VDLnsU7.jpg


    The pistons were in the ultrasonic all day with fresh water/ct18 mix again, this time they came up beaut.

    Fi1XMd5.jpg

    IYLP7cr.jpg

    yGBV880.jpg


    There are some marks which probably correspond to the ones on the cylinders, but I didn't think they were this bad before. Possibly the pistons were touching the cage in the ultrasonic cleaner?

    LaG2hBu.jpg

    xCdgNBI.jpg


    Onto the valves. A 'before' shot of an exhaust valve.

    Jo4Midg.jpg

    After

    bl85qxp.jpg

    LghKDrp.jpg
     
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  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Make sure your ring lands are spotless too.
     
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  10. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    Bad news. Head has cracks. You can see it in the first pic in my last post. There is at least 1 crack on all 4 banks, some have 2.

    Need to finish cleaning it up and decide what I'm going to do with it.
     
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  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Get another head. You have invested too much time and money into this bike to just walk away.
     
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  12. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    I'm thinking about how to repair it if possible
     
  13. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Okay so you have to remove all the seats, weld the head, re-thread all the spark plugs, and machine and install all new seats. If you are going down that path I would use 8mm spark plugs to get the extra meat. This is a specialist job. In Brisbane, Liddle's Cylinder Head Engineering used to be capable of this type of work. Not going to be cheap.
     
    Last edited: Sep 20, 2018
  14. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

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    Are all the cracks on the exhaust side? How deep are the cracks?

    Head.jpg
     
  15. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    There are some on the inlet sides, this one on #4 looks fairly deep, about 3 threads or so. I don't know how this head didn't drop the seats.

    17EsSMR.jpg

    Two cracks here

    WCFmGdx.jpg

    Another two here, diagonally opposed, a bit hard to see

    oFaP35U.jpg

    Another two the same

    vzdVafr.jpg

    Two more, one inlet one exhaust

    k8p3N2V.jpg
     
  16. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Dollar wise, get another non cracked head. To repair will cost more than your whole bike is worth, but most things can be fixed with enough time and money.
     
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  17. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    boat-anchor-1-3d-model-low-poly-obj.jpg
     
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  18. Grasshopper

    Grasshopper Well-Known Member Premium Member Dirty Wheel Club

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    Shouldn't be too hard to find a good head...
     
  19. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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  20. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    Facebook to the rescue, got a complete head in good condition coming from a bloke in Perth.
     
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