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Thread: Tf 125 motor bucket thingy

  1. #91
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    Quote Originally Posted by husaberg View Post
    buggar you are right the latter 80-84 are CR cylinder reed rather than case reed.
    ones prior to about 78 are piston port that will be okay.
    but the os ones for 87 on are crankcase reed.

    the 2mm oversize etc big bore pistons are made genarally for steel sleeves
    hve a look through the list
    personally i would try and find ones for a steel sleeve with oversizes the ones for plated cylinders only have std plus big bore.
    shame strike dont do 56mm bores
    WHat bore do you actually have?

    We can do any size you want up to around 56.5mm using the KT100S casting, but piston weight at 56mm is going to be up around 160gm.
    56x1x2.25mm rings are common from the old 54mm +2mm mx engines.
    What compression height and piston length do you need?

  2. #92
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    Quote Originally Posted by Brett S View Post
    We can do any size you want up to around 56.5mm using the KT100S casting, but piston weight at 56mm is going to be up around 160gm.
    56x1x2.25mm rings are common from the old 54mm +2mm mx engines.
    What compression height and piston length do you need?
    Not sure if it needs to be quite these dimensions but this is STD i believe
    Click image for larger version. 

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    ps cool
    i think i need some soon on about 56mm too........
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  3. #93
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    The KT100S pistons are 56mm long and 23mm compression height.
    It doesnt look like it would fit without machining a fair bit off the bottom of the cylinder and if piston ported may be too short?

  4. #94
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    Quote Originally Posted by Brett S View Post
    The KT100S pistons are 56mm long and 23mm compression height.
    It doesnt look like it would fit without machining a fair bit off the bottom of the cylinder and if piston ported may be too short?
    How big do the KT100J ones go to?
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  5. #95
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    Quote Originally Posted by husaberg View Post
    How big do the KT100J ones go to?
    The KT100J's are made for a bore of Ø50.0mm and would be very heavy at 56mm, the biggest i recall making was around Ø54.5mm for some agricultural/lawnmower situation.
    Dimensionally they would suit better. 60mm length 33mm compression height.
    You would have to spend alot of time lightening them.
    They use the same outer die set as the KT100S which is roughly 58mm cast, but would also only clean up at around 56.5mm max.
    Their gudgeon pin boss is thinner than the KT100S.

  6. #96
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    Quote Originally Posted by Brett S View Post
    The KT100J's are made for a bore of Ø50.0mm and would be very heavy at 56mm, the biggest i recall making was around Ø54.5mm for some agricultural/lawnmower situation.
    Dimensionally they would suit better. 60mm length 33mm compression height.
    You would have to spend alot of time lightening them.
    They use the same outer die set as the KT100S which is roughly 58mm cast, but would also only clean up at around 56.5mm max.
    Their gudgeon pin boss is thinner than the KT100S.
    Cheers i remember seeing one it looked like a Villiers.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  7. #97
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    Yeah i remember getting all excited about the Js for 100cc -until I saw one
    Don't you look at my accountant.
    He's the only one I've got.

  8. #98
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    Quote Originally Posted by F5 Dave View Post
    Yeah i remember getting all excited about the Js for 100cc -until I saw one
    Yeah its a lot of space above the pin
    here is Yows attempt
    The pictures speak for themselves
    No wonde everyone destroked.
    Tis a shame as the KT100S pistons are just what the class needed only just a little too big in the bore.
    Click image for larger version. 

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    if only there was a Strike KT100S piston on 50mm and above sizes.
    Plus a strike KT100s up to 58mm
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  9. #99
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    Pity Euro didn't make an AM8 engine. 100cc version of the AM5 or 6 but 99cc.

    Hell I'll take it as a scaled down RSA but with crude restrictions to make it a roadbike while I'm dreaming.

    Then we can spend our time tuning it to a standstill.
    Don't you look at my accountant.
    He's the only one I've got.

  10. #100
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    Quote Originally Posted by husaberg View Post
    Yeah its a lot of space above the pin
    here is Yows attempt
    The pictures speak for themselves
    No wonde everyone destroked.
    Tis a shame as the KT100S pistons are just what the class needed only just a little too big in the bore.
    Click image for larger version. 

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    if only there was a Strike KT100S piston on 50mm and above sizes.
    Plus a strike KT100s up to 58mm
    For destroking have you seen the eccentric big end pins:
    https://www.sip-scootershop.com/en/p...tric_4043ad178
    These can be used either for stroking or destroking or even illegally changing ignition timing on very controlled classes as someone got caught out for years ago.

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