10000 hours on a gas inboard engine would be equivelant to 50 mph (fairly
average overall speed) x 10000 hours = 500000 miles. I don't think so.
Probably 3000 - 4000 hours is more realistic.
1025 hours in 16 years = 64 hours a year. Low to average overall.
Most engines if maintained properly, using good gas and oil, will run for
2000 hours or more before needing a rebuild.
I would not worry as much about the engines (assuming they check out ok in
terms of comression, lower unit, carbs, etc..).
I would worry more about the boat an the condition of any wood (stringers,
transom, seats, floor, etc) and electrical systems.

Tony


"Jim and Becky" wrote in message
...
I'm pondering (always will be) a boat with a pair of 1988 Yamaha 200's.
The seller says they have 1025 hours on them.
Assume they weren't used commercially and have been well taken care of.
What is the life expectancy (total hours) of these?
Lets say we call them obsolete when they drop more than 15% of their
original output. I'm in an area I know nothing about but some power loss
might be expected due to worn pistons, etc.
All I can think of is one motor dying about the first of July and getting
the boat back in the water around mid September.
I remember reading 10,000 hours for an inboard gas, maybe twice that for
an
inboard diesel?