Make sure your shifter cable isn't out of adjustment . It must be in true neutral position on the engine and not advanced out of position. All boats have a safety feature that either cuts power to the starter or the spark plug and fuel pump. There are is a little adjustment room on either end of the cable . If you are in sure disconnect the cable at the engine and move the leaver on the engine to neutral . Then try and start up. The other issue that is over looked is a bad kill switch on the shifter or a corroded and or loose battery wire at the battery or at the engine.
SOURCE: Yamaha outboard motor manual
You got it :
http://www.yamaha-motor.com/outboard/service/viewmanuals/outboard_manuals.aspx
here !
SOURCE: 40hp 1987 yamaha outboard motor will run for 30-60
Sound like the fuel pump is not keeping up with the engine's demand. Check it out. Good luck. Hope this helps.
SOURCE: I have a 85hp Yamaha outboard motor. It starts
sounds like the ground wire in the control box where your key switch is located is broken are disconnected. check the wiring harness plugs if it is unpluged are not pluged tight it will not shut off
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