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Hard to find any good info on TR-1s in boats, they seem to put those engines into boats last - after snowmobiles and jet skis. But the TR-1s have been around for awhile, at least 5+ years.
And in general I would think those Yamaha motors are the last thing to worry about in our boats. I think.
I don't recall any issues being reported on greenhulk. Never heard of timing chain problems with those, either.
If run regularly and not sitting much, I would bet those TR-1s and 1.8s will go way over 1,000 hours before an overhaul.