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Old 09 June 2015, 11:27   #11
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We're river based so haven't had that one out to sea I am afraid.

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Old 09 June 2015, 12:54   #12
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The performance of the 75 two stroke will be significantly better than the 60 four stroke if that's important and the reliability of a gearbox will have more to do with how it's been driven and maintained. As far as I know the gearbox on my Honda BF130 came from that 75HP Mercury. Over the years I've had a couple of gearbox failures, but never Mercury or Mercruiser.

I take it the way you know your Yamaha has the gasket problem is when there's a smell of hot metal and steam and smoke coming from places it shouldn't be

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Old 09 June 2015, 16:18   #13
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seems a bit harsh to me. the 75 and 90's are great engines - they love to rev, are are easy to work on. the one piece block means no head gasket to fail, though to be fair that also causes a problem should the block need a rebore. the early black stators did fail (though mine is still fine)the red ones are way better. ive never heard of the gearboxes being weak, but any failure is likely to be caused by operator failure - ie being slow to engage gear, chewing up gears.
Originally Posted by phantom 19 View Post
The Mercury 75hp two stroke is a massive lump of an engine, a detuned 90hp which was already heavy for its class. It is also not the greatest engine with usual Mercury issues with the stator which will fail at some point, shonky lower shock mount castings, one piece block and head casting etc. gearboxes seem weak too, there is a ready market for second hand good gearboxes. The Yamaha 75/90 was/is infinitely better.

The mariner 60 fourstroke is a Yamaha powerhead that Mercury/mariner bought in and in their wisdom mated it to one of their own legs / gearboxes. They got the leg water pipe sealing arrangement wrong and used a iffy rubber seal which over time deteriorates and actually blocks the water pipe up. Resulting in having to lift the head and strip the leg down to component pieces to rectify. Otherwise it is a good powerhead although dated now with four carbs etc which if DIY fiddled with need setting up properly again.
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Old 09 June 2015, 16:28   #14
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Originally Posted by buzz View Post
Thanks for the info on your 60 4 stroke and its performance with 3 big lads aboard. Do you use it just on the river or do you also use it on the sea. Would be Interested in how it would perform in a bit of a chop.
Not sure but I think the 75 2t is about the same weight as the 60 4t and on a humber assault I think the lighter engine will suit the hull better.

We had a 70 2 stroke Tohatsu on a 5m assault and it was just right, I always wanted either a 75 or 90 2t mercury just for that bit extra.

The early 4 stroke mercury's are huge engines and look really heavy, I am sure if they have both been looked after they will both be good, for turn of speed nd pure fun I would go with the 2 stroke, best of luck, great boat

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