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    1988 yamaha 150 v6 outboard rpms drops and mph too

    i keep having problems with the rpms droping.i can only get up to 4000 to 3900 rpms .when i gun the gas the miles go up to 34 mph then they drop to 28 and 29 .i have done so much to this motor and still cant get to go faster . does anyone know what the rpms are suppose to be ?i need help...
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    1988 yamaha 150etlg outboard motor (motor problems)

    im having problems with this engine once i take off the rpms go up then they kick down and stay at 3000 rpms .the motor always turn on never fails but, i know that this motor goes faster . i had my carbs rebuilt twice and its not helping .i also bypassed the gas tank and installed an external...
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    1988 outboard yamaha 150etlg

    im having problems with this engine once i take off the rpms go up then they kick down and stay at 3000 rpms .the motor always turn on never fails but, i know that this motor goes faster . i had my carbs rebuilt twice and its not helping .i also bypassed the gas tank and installed an external...
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