125 conversion to 200
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  1. #1
    Junior Member gardar's Avatar
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    Oct 2012
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    Hi all just got myself a TW 125 will post up some picks as I go bought as a non runner so new what I was getting into just stripped the head off and its all mullered piston ,valves, head the thing is can I get a 200 kit like sleeve barrel piston ect to go into my bottem end of whats left of my engine or just easeir to fit a 200 lump straight in if so any complications the only thing here in the UK the 200cc are not about.

    Thanks Gary.l

  2. #2
    Senior Member macbig2k1's Avatar
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    Jul 2010
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    Hi Gery,



    here is the complete list, to convert your 125 to 200ccm (67mm x 55,7mm) -> 243ccm (73mm x 58mm) is also possible

    - 185 (SR185), 200, 225 or 230 cylinder head

    - 200, 225 or 230 cylinder

    - piston available from 67 to 73mm

    -> a 73mm piston can be installed into a 200ccm (67mm) cylinder, but you will need a bigger sleeve

    - 185 (SR185, 55,7mm), 200 (55,7mm), 225 (58mm) or 230 (58mm) crankshaft

    -> Important: There are 2 different version avaiable, some older without e-start (short pivot) and the newer one with e-start (long pivot).



    And if you have a DE01, than you have to buy the pressure plate from a DE05 to convert your clutch from 4 to 5 disks.

    I recommend to use the clutch springs from EBC (CSK052). These springs are much more stiffer as the Yamaha springs.

    And if you want to upgrade to 230ccm or more, than you have to use some other stiffer springs from EBC -> you can get these one from me (TW-Parts.com).

    The best clutch kit will be:

    - friction plates from Barnett

    - steel plates from Lucas

    - stiffer springs from EBC (the stiffer version, not CSK052)





    The last important:

    You have to buy a other carb, if you have a DE01.

    The DE01 carb is too small.



    Regards, Sebastian

    TW-Parts.com

    Germany

  3. #3
    Junior Member gardar's Avatar
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    Oct 2012
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    Thanks for some quick info that helps, I have all winter to get her back on the road so may still look out for a 200 motor complete while the project goes on.

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  5. #4
    Senior Member macbig2k1's Avatar
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    A complete engine will be more expensive as upgrading your 125 to 200....243ccm.

    Yes, you will have a bit more time to spend into your engine, when you will install used parts. But this does have a positive effect too: You will get to know your engine and you will, what's wrong and what's ok.

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