The words Yamaha and corrosion go hand and hand. The Japanese must use some poor quality aluminum. Recycled beer cans or something. I have replaced dozens of those f225 midsections. It's such a problem Yamaha made a "kit" with all the necessary parts to do the job. I'm with you Vic. My Opti has never been flushed. Except once or twice after churning through some shallow muddy bottom and clogging up the powerhead. And still after changing t-stats the inside of the heads are as good as new.
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