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40 hp mariner outboard runs good in gear ,but will shut-off in neutral ,won,t idle

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Check Idle Air screw Should Be 1.5 Turns Out From Lightly Seated Full In Position. +- .25
+ Idle Screw On Side Of Carburetor.

Posted on Mar 20, 2013

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You need to pull the cover and track where the trottle cable goes to on the motor. If you have someone open and close the throttle while you're watching you will find the linkage that it controls. There should be some kind of an idle ajustment screw there that you can readjust to increase your idle.

Posted on Oct 18, 2009

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