I have a Yamaha 90TLRU with the 703 controller on my Duracraft aluminum boat. Some time ago I noticed a spot of oil on the concrete under the motor. Investigation revealed the source of the leak coming from the oil sensor?s rubber cap on the 2-stroke oil tank. While the boat was out from under the carport, I thought I would exercise the motor as it had been sitting for about two months. Turning on the ignition switch, the alarm buzzer came on immediately. I have a service manual and looking at the troubleshooting chart, one of the possible problem items causing the 'Irregular Warning Indication' is the oil level sensor, and assuming that this was the problem (due to the leak), I replaced the sensor with a new one. I also replaced the entire oil tank and associated components. I tested both the upper and lower float switch position with my Fluke before installation and everything looked good per the manual. That took care of the leak, but the buzzer still sounds when I turn on the ignition. When I raise the motor to its top position, the oil level drops in the rear of the tank, the float moves down its stem and the buzzer stops. As soon as I lower the motor again, the rising oil level pushes the float back to its top position, and the buzzer comes on again. Why would the buzzer sound if the oil tank is full?
I have also checked the thermo switch?s operation per the shop manual ? it works perfectly as the water bath temp increases and decreases. I don't think my problem is related to the water cooling circuit, as the buzzer sounds as soon as I turn on the ignition, when the engine is completely cold.
I have checked all the wiring and harness, and everything looks good ? no corrosion nor any loose connections that I could find.
My boat does not have an oil level warning lamp in its instrument cluster, so I don't think that buzzer is related to anything in the wiring to the cluster.
The only remaining item in the trouble shooting chart that could be causing the buzzer is the CDI unit. This baby costs about $500.00 to replace and I want to be sure that it is in fact the problem before I drop the moola. I have searched this forum thoroughly and could not find anything I have not checked. Can anyone throw any more light on where else I could possibly look?
I have also checked the thermo switch?s operation per the shop manual ? it works perfectly as the water bath temp increases and decreases. I don't think my problem is related to the water cooling circuit, as the buzzer sounds as soon as I turn on the ignition, when the engine is completely cold.
I have checked all the wiring and harness, and everything looks good ? no corrosion nor any loose connections that I could find.
My boat does not have an oil level warning lamp in its instrument cluster, so I don't think that buzzer is related to anything in the wiring to the cluster.
The only remaining item in the trouble shooting chart that could be causing the buzzer is the CDI unit. This baby costs about $500.00 to replace and I want to be sure that it is in fact the problem before I drop the moola. I have searched this forum thoroughly and could not find anything I have not checked. Can anyone throw any more light on where else I could possibly look?