Re: Poppet valve '99 Merc 150
Mine doesnt do anything.
Its supposed to open up to allow more waterflow through the motor above 2500 rpm.
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Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke.
1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.
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