I have an 07 Yamaha 90/65 jet 4-stroke with around 370 hours. This year, the motor began to occasionally sound the warning buzzer on a cold start-up. The buzzer would come on a few seconds as a continuous tone after the engine starting, at which point I would shut it down. The first time or two, I suspected possibly low oil pressure, so I pulled the cowling and checked the oil level, all good. Once I restart, I get no alarm. I did see that there's a water in the fuel sensor that is connected to the alarm, but will only sound when in neutral. I checked this today when the alarm came on by shifting while it was sounding. it It had no effect. I would suspect if it were low oil pressure, that I would hear valve noise, like you would after an oil change before the oil circulates, which I do not. I should also mention that I do have a Yamaha multifunction tachometer, but I installed it after it came off a boat that sank, so I'm not sure if I trust that the warnings on that would come on. What do you all think it could be?
