Piston Installed backwards?

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?

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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