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Thread: Stx 900 rebuild

  1. #1

    Join Date
    Jul 2009
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    Stx 900 rebuild

    Just rebuilt top end on project stx900
    i replaced crank seals and rebored one cylinder and honed all three also a new piston and rings where fitted to rebored cylinder .5 bigger and fitted fresh gaskets the problem I have is there is low compression on the rebored cylinder with the new piston 60 psi to be exact on the two with just a hone running old pistons there is 110 psi on both.
    The engine was rebuilt due to oil starvation on 1 cylinder and all readings where done on fully charged battery and with plugs out warm engine with some oil down bores and used two testers on 3 seprate tests.
    Sny thoughts what could be causing this guys?
    Also to add engine runs and idles fine but will only hit 30 mph


  2. #2
    steve45's Avatar
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    Do you have the piston facing the correct direction? Rings right side up? Did you check the ring end gap? Piston/cylinder clearance? Head gasket good?

  3. #3

    Join Date
    Jul 2009
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    All good

    Quote Originally Posted by steve45 View Post
    Do you have the piston facing the correct direction? Rings right side up? Did you check the ring end gap? Piston/cylinder clearance? Head gasket good?
    All good. Gaskets new piston right way and rings right way also all has been checked by dealer and he has not got a clue what's wrong

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