Piston Installed backwards?

1 reply to this topic
  • ILOAD2

Posted October 07, 2012 - 06:50 PM


If the piston was installed backwards on the Yamaha 5 valve motor,would the 3 intake valve buckets depress fully and smoothly as I hand crank the motor via the 17mm nut on the rotor? Or would it lock as the center intake valve depressed?

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  • highmarker

Posted October 07, 2012 - 07:04 PM


most likely hit the piston but never tried it, if your not sure pull it apart or maybe use a bore scope like used for checking wash on a twostroke to look through the plug hole.


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