My powerhead did not blow on my Sho-4 stroke. It turned out to be my lower-unit. I ran over a crabtrap and the line wrapped behind the prop. I did not recognize the problem until I made it to the ramp and pulled out about 18 inches of line wrapped inside.It blew about a week later. Dealer wrote it off as a defective seal. Yamaha then shipped me a new lower unit. All Warranty...
I ran Mercury outboards for decades. It was difficult to go with Yamaha, but after some research I decided to make the change. Its basically new technology. Its lighter by almost 100 lbs as last years 2 stroke and has more torque as well.
Mercury may come out with the same technology in the near future. Who knows...
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