I have a 140hp Yamaha 1985 model. I have an intermittent high pitched noise coming from the forward lever control unit. Motor appears to run ok even with the noise although I throttled right back to avoid possible damage. Turned the motor off and then back on and the noise continued. Then I turned the ignition key slightly anti clockwise and the noise stopped...but I lost power to the instruments (trim & Tilt, oil lights etc). When it is there the noise continues whether in neutral or in gear. I have had trouble where the motor does not stop when the key is turned off (only happened twice in twelve month so very intermittent and the ignition in the forward control has been replaced 2 yrs ago)they could be related?