[ChrisBennet]

Hi guys,
I wasn't successful in measuring the displacement. My plan had been to use the engine like a syringe to pull water out of a jug and measure how much was removed. The hose was hopefully long enough to allow the sucked water to reach the motor. The overlap of the cams was such that it wasn't possible.
Jack, in retrospect we should have just filled it with oil. It would have been a little trickier than you might think. The plug hole would need to be vertical which would require the motor to be tipped to one side AND tipped back some which we could have done with his "hoist" (tractor bucket loader).
-Chris