Why did 295cc seize? oops! duplicate thread - ignore

[langted]

I inherited a repair on my son's EZ with 295cc robin. I think its about a 2004 in "average" condition, bought early in the Summer. I Went to his seasonal campground end of last Summer, drove the EZ about an hour-- starting stopping and just looking around. Drove another 200 yards to ice cream stand. stopped 15 minutes. Drove back slow 200 yards eating ice-cream. Everything absolutely normal, no noise, no smoke. Came back out 2 hours later and engine was seized so tight it can't be budged with a 14 inch crescent wrench (on 3/4 inch bolt threaded into clutch end. ) The oil was a little low on stick. Just about at lower mark.

So I told him I'd fix it and I now have the engine on my bench. Any thoughts on cause? Is this common?