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Thread: kx125 engine rebuild

  1. #1
    Join Date
    10th November 2006 - 08:32
    Bike
    kx250f,kx125
    Location
    Auckland
    Posts
    188

    kx125 engine rebuild

    hi All,
    i am currently working on a 2003 KX 125 which i purchased quite cheap (blown engine).
    I purchased a new crank and piston and have split the cases. Here is the problem--- The manual suggests using kawi bond to put the cases back together since it does not have a gasket.
    I was wondering if there was another substitute available that i could use instead of Kawibond to put the centre cases back together again. (let me know what and were i can get it)
    any suggestions?
    also,
    would any one like me to post pictures of the entire rebuild process? i intend to replace a lot of the stuff and make it brand spanking new (or as close as possible)
    already secured some bits and in the process of acquiring a few bits more.
    Tell me what you think i should do to this bike.
    I have a kx250f that i am using right now and this is just a project to keep me entertained..so time is not an issue.
    Thanks and hope someone has afew suggestions

  2. #2
    Join Date
    15th February 2005 - 15:34
    Bike
    Katanasaurus Rex
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    The Gates of Delirium
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    9,017
    Threebond 1104.

    Most bike shops should be able to supply, or source, it.

  3. #3
    Join Date
    2nd August 2006 - 22:17
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    hopefully bringing something back to NZ
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    Hartford Connecticut USA
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    go to repco an get a tube of threebond best stuff same colour as casings so you dont see it after and can be used every where.
    [SIGPIC][/SIG

  4. #4
    Join Date
    28th November 2007 - 13:41
    Bike
    2008 CRF450, CBR900RR, 125 Pit bike
    Location
    Hamilton
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    733
    Yip three bond is the best but not cheap! Last Two stroker i rebuilt for a mate that was on a budget i used Loctite blue max. Still well stuck. A lot of it is in the surface prep to.

    Make sure you spend a bit of time making sure the power valve is mint! a lot of two strokes are slow because these gum up after a while. Make sure the carby is spotless while you are at it and inspect reeds.


    Its a two stroke not much can go wrong.

  5. #5
    Join Date
    10th November 2006 - 08:32
    Bike
    kx250f,kx125
    Location
    Auckland
    Posts
    188
    thanks guys.
    have the manual so will check the power valve and make sure the carbs serviced as well. just purchased a carb rebuild kit (thought i should do that)
    Can't wait to ride a 2 stroke again

  6. #6
    Join Date
    30th October 2009 - 14:11
    Bike
    2 smokers
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    Titirangi
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    264
    Go ahead and post details of rebuild, everyone can then have their two cents worth .

  7. #7
    Join Date
    22nd April 2009 - 19:57
    Bike
    2007 Yamaha WR250F
    Location
    Westharbour
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    Quote Originally Posted by xxblackbirdxx View Post
    would any one like me to post pictures of the entire rebuild process? i intend to replace a lot of the stuff and make it brand spanking new (or as close as possible)

    absolutly yes.
    Quote Originally Posted by Ktmboy View Post im gay i like men Quote

  8. #8
    Join Date
    10th November 2006 - 08:32
    Bike
    kx250f,kx125
    Location
    Auckland
    Posts
    188

    fork swap

    I have access to a 2007kx250f front end. Triple clamps, forks and wheel.
    Will this fit on a 2003 kx125?
    all these bits are sitting at my in-laws place in the south island. I was hoping to upgrade the front end on my kx125(03).
    I know they use the same stem bearings and was hoping they would fit.
    Can anyone shed some light.
    On another note , the engine rebuild is coming along well. have ordered some boyesen case covers and V3 reeds. The pro circuit pipe and muffler are here already. so the hunt for more after market bits continue..
    Let me know if you guys think there are bits i could use to improve the bike.

  9. #9
    Join Date
    9th January 2006 - 12:26
    Bike
    KX450 Motard/Flat Track KTM150SX H2R
    Location
    Tauranga
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    4,445
    the 07 front end will bolt in, and it is a good improvement, the showa twin chamber forks are amoung the best available, (and is the same mod i want to do when i get a KX125, i want to use a 05 or later on tho)

    the bearings are all the same,

    the only issues comes from the steering stops, and the alloy frame uses a different system, you have to make up some from of steering stop to stop damage in a crash situation,

  10. #10
    Join Date
    10th November 2006 - 08:32
    Bike
    kx250f,kx125
    Location
    Auckland
    Posts
    188
    thanks scott. i happen to have a 2007 kx250f with me in auckland . will compare the two as far as the stops are concerned. Lucky i have not had the frame powder coated yet.

  11. #11
    Join Date
    30th October 2009 - 14:11
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    What are you going to do with the 125 forks? I could be interested but would ideally need the triple tree and front wheel as well for a kdx200 upgrade.

  12. #12
    Join Date
    10th April 2008 - 12:42
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    SV1K
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    Quote Originally Posted by gwynfryn View Post
    What are you going to do with the 125 forks? I could be interested but would ideally need the triple tree and front wheel as well for a kdx200 upgrade.
    Yes me too, keen to put them on my kdx200.
    PM me with a price if gwynfryn isn't keen, Thanks.

    Pete

  13. #13
    Join Date
    9th January 2006 - 12:26
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    KX450 Motard/Flat Track KTM150SX H2R
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    those forks / triple clamp will fit straight into the KDX's, but you will have to run the kx front wheel as well, and maybe even the brake as well, (cant remember if the KDX brake caliper fits)

    from memory you have to run the KDX steering head bearings,

  14. #14
    Join Date
    30th October 2009 - 14:11
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    Its not totally straight forward. The kdx stem has to be pressed into the kx or kxf triples.The calipers will fit but there is dicking around with the brake line and as Scott mentioned the steering stops. If you want to keep the head light thats more work.
    Apparently klx forks and triples will bolt straight up without stem issues and you can use the kdx front wheel.They have less flex than the kdx forks and you lose the underhang.
    I love my kdx but have reached the limit with the (re sprung) standard forks.

  15. #15
    Join Date
    9th January 2006 - 12:26
    Bike
    KX450 Motard/Flat Track KTM150SX H2R
    Location
    Tauranga
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    Quote Originally Posted by gwynfryn View Post
    Its not totally straight forward. The kdx stem has to be pressed into the kx or kxf triples.The calipers will fit but there is dicking around with the brake line and as Scott mentioned the steering stops. If you want to keep the head light thats more work.
    Apparently klx forks and triples will bolt straight up without stem issues and you can use the kdx front wheel.They have less flex than the kdx forks and you lose the underhang.
    I love my kdx but have reached the limit with the (re sprung) standard forks.
    yes KLX forks will fit straight in, getting the brake line is fairly easy now as there are a number of places that make brake lines up,

    will have to go back and do some research, but from memory i think you are right about the stem,

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