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    Yamaha 140 water pressure drops. Poppet Valve?

    Yamaha 140 BET 4 cyls 140 HP outboard, premix, 6 x 3 months seasons insalt water (aprox 300 hours). Off seasons I run it weekly for 15 minutes with the garden hose and muffs.<br /><br />Last year it started overheating past 4000 RPMs, sometimes: pressure would climb up to 20 psi and suddenly...
  2. H

    Yamaha 140 water pressure drops. Poppet Valve?

    Yamaha 140 BET 4 cyls 140 HP outboard, premix, 6 x 3 months seasons insalt water (aprox 300 hours). Off seasons I run it weekly for 15 minutes with the garden hose and muffs.<br /><br />Last year it started overheating past 4000 RPMs, sometimes: pressure would climb up to 20 psi and suddenly...
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    Yamaha Lower Unit pressure test 11 psi leak

    5 seasons, 250 run hours on Yamaha 140BET in saltwater. Off season, ran weekly in fresh water for 10 minutes. 2x yearly lower unit oil changes, golden color in and out always. A little shavings on the magentic plug. Did a pressure test with lower unit without oil(supposed to hold 14.2 psi for 10...
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