Yamaha 90 Power shutdown

[GP12b]

Intermittantly the power will shut right down and run on what seems like one cylinder giving 5 knots max. It tends to do this after wakeboarding (working hard), and always after a tank change. Mechanics have done carbs and fuel filters. Cooling flow looks good, but if water jacket is blocked one side could this cause overtemp and cylinder shut down, as it's intermittant?<br /><br />GP

 

[butlp]

Re: Yamaha 90 Power shutdown

Defiantly sounds like a fuel problem if it happens after a tank change! <br />What happens when you squeeze the primer bulb, is it hard and does the motor pick up? <br />How long does it last before the motor starts to run again? <br />Did your mechanic look at the fuel pump and all fuel lines? <br />I would check the connection on the tank as you may have a worn “O” ring seal which would cause air to be drawn in with the fuel. Make sure you buy the Yamaha part as the universal connectors are not as good.

 

[rodbolt]

Re: Yamaha 90 Power shutdown

hello<br /> check all the lines and rebuild the pump. its easy and needs to be done periodically. good luck and keep posting.