Just wondering .

Not sure?

I think I have a little over 240 hours on my 1989 Mercury 200hp. Still just as strong as day one, but I baby my motor and flush it every time with that de-salt stuff.

I have heard of as much as 1500 hours before a rebuild?

Ask Packinair, hes got eggbeaters hangin off the back of his boat.

This question is pretty broad...
I have seen 800 hr engines that are tired out..
On the other hand... The local POlice just retired one set of '04 DIs with 5600hrs...yes 5600. They troll 85% of the time, 10% at WOT...

Every motor is different too. New technology engines are designed for several thousand, not several hundred hours... We use the ICOMIA scale of usage to design for longevity...

Current two stroke OBs will outlast current 4 stroke OBs by 10 times.......

A carb two stroke will run for a zillion hours.

we are changing out a 25 hp 4 stroke yamaha kicker motor 2001 for a new one it has 6500hrs on it and still running normal the small blocks in this boat have over 12000 hrs Never underestimate how many hrs a man will troll for a fish!

10 minutes is too much for me.Never own one again.

Compression check, leakdown test is all it takes ..They run a LONG time
You know they need a rebuild when they explode

I had about 400 hrs. on 300 Promaxs when I sold my cat and they ran like new.