Re: External rotary valve problem

[George Emmanuel]

Without being there and seeing it, it is hard to answer. Rotary valves sometimes had issues with moisture settling in the lower bearing and corroding he bearing. That led to the barrel, as I call it, in the valve moving and rubbing against the valve bore. That caused wear leading to excessive clearance. How does the surface of your barrel look?–Smooth with no lines?

Other than that the only thing I can think of is timing. What is the position of the piston when the "J" is visible in the inspection hole?–Did you time it before TDC or after TDC? Should be after TDC.

George