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I bought a boat with a 1998 Yamaha 15 HP, 4 Stroke engine, F15ELHX,which was not running well. Since purchase, I have gotten “most” issues worked out, but in order to run at full throttle and power,...

Thanks.

No, I have not yet. But I do have a new external fuel line to install and a new tank coming. Should I consider replacing the internal lines or flushing?

I bought a boat with a 1998 Yamaha 15 HP, 4 Stroke engine, F15ELHX,which was not running well. Since purchase, I have gotten “most” issues worked out, but in order to run at full throttle and power,...