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96 Mercury 175 vs 92 Yamaha 150

Old 11-27-2019, 07:02 PM
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Default 96 Mercury 175 vs 92 Yamaha 150

I have 2 bass boats one of them I have had for a couple of years now (86 Champion / 92 Yamaha 150 saltwater series carbureted) I just bought a 92 Champion / 96 Mercury 175 carbureted). The Yama still has the oil injection system and works fine and runs on non ethanol fuel w/ amzoil synthetic oil, runs strong, quick start up. The Merc has the oil injection deleted, the Merc looks like they upsized the crossover water cooling hose line from head to head on the top of the block. Quick start up, runs strong, Pennzoil synthetic oil.

Otherwise that's all I know about both motors, the question I have based on the year and make which of the 2 motors is most desirable.

I'm wanting to pair up the favored motor with the 92 Champion and sell off the 86 Champion with the other motor.

I have heard that Merc got better and more reliable in the 90's but when in the 90's, what year ?

Do I own a desirable year of the Merc or not.

I'm looking for any thoughts on both motors as far as which one is more desirable, reliable, dependable.


Old 11-27-2019, 08:51 PM
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In less than 2 months the year will be 2020, because the engines are SO OLD each engine needs to be inspected and evaluated on an individual basis.

They were both strong motors. 2.5L mercs are very strong. 96 - 98 were good years (probably the best). 2.5L 200's and 2.5L 225 promax from that vintage are much more desirable than 2.5L 175's or 150's.

common weak points:

Merc - oil injection, voltage regulator connections, stator, swivel pin (steering arm corrosion), motor mounts.

Yamaha - shift shaft, trim and tilt seals, steering arm, general corrosion.
Old 12-06-2019, 05:51 AM
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Thanks for providing your help.
Old 12-06-2019, 06:28 AM
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I agree with Bigshrimpin whichever engine seems to be in the best shape is the one I would keep. Having said that, the merc is newer with a few more ponys so both being equal, I would keep the merc.
Old 12-06-2019, 08:30 AM
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I lean to the Mercury, parts and info on the motor is widely available, not sure about Yamaha. Have compression/leak down test done and pull lowers and inspect as much as possible.

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