Fred, you were right after all!

I took my cylinder head off last night and found that the pin that lined up the cylinder liner had broken off. I had the liner lined up correctly when I re-assembled the engine, but when I put on the cylinder head, the bolts didn't line up exactly and I twisted the head approx 15 degrees to line them up. This had the effect of moving the liner slightly. I put it back together carefully and started it up today at lunch time and it ran perfectly !!!

Once again, thanks for all the ideas !!!


Ron