No symptoms, just smoke like a bango one morning pulling out of the drive.

No compression in the #1 cylinder. The mechanic pulled the top and found the piston. He also assumes the head is cracked based on a prechamber peek. All my oil is going into the crankcase....

The aluminum heads on these engines are apprently some trouble at times. I talked to the folks at Metric Motors and they told me it's hard to keep that engine in stock because of the head. Thay were very nice about it, but admitted to it being a rare engine with some problems at times.