Spareparts beat me to it. PHNX - 150XR6 is a Merc 2.5L two stroke . . . Same block as the 2.5L 200hp.
Quote:
all indications are that Mercury is more of a sales organization than an engineering one
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That might be true today, but no outboard company put more resources into engineering, testing and research than Mercury. LakeX, Placida Test Facility, mercury racing => 1960 - 80's . . . Merc built the fastest motors around. Their props are great too. I can't comment on the new motors other than the weight of the verado

But their old two stroke motors and inline motors are/were very good and strong.
Yamaha - Yamaha's 2.6L motor is one of the most reliable engines, but the block was a masterfully engineered copy of the early OMC v6. 1983 lawsuit.