I have a Yamaha 150 on a 21ft Mako. Top speed is 35. Last weekend the engine would not move boat above 22 and then after *****ing for a few hours top speed returned to 35 and then slipped back to 22. Bottom is clean. RPM seems to be fine. I checked the external fuel filter and it appeared clean. Any thoughts before I take it to a mechanic? Thanks.
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clogged fuel filter?
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