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Posting a reply to: 75 hp Merc Optimax issues - shop can't figure it out!!!

Muskie Fishing -> Muskie Boats and Motors

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Landry

Posted 6/23/2011 5:26 PM (#504176)
Subject: 75 hp Merc Optimax issues - shop can't figure it out!!!

Posts: 1023

Let me preface this by saying: I am not handy/mechanically inclined at all:)

I have a 75 hp opti that has been running perfectly since a complete warrantied replacement of the ignition coils - until last day.
• First of all - my battery has gone dead while resting in the garage for a few weeks twice now - battery is less than a year old?? I just tested the battery and the voltage reading was 12.34 V - is that a little low or okay?
• When I start the motor it fires up fine but at times I am getting a wobbly/weak beep instead of a solid one which is normal - low battery sign???
• Twice it stalled out/sputtered at low rpm's last trip - which it never does.
• When trimming the motor up and down last trip I noticed that the rpm's dropped while trimming - never noticed this before. This seems to point to a power problem but what do I know?

I have heard these motors are very voltage sensitive?? Is the battery the root of the problem or is it a fuel filter issue maybe - never changed it (owned motor for one year). Is the fuel filter easy to change by myself anyways??

Anyone recognize any of these minor symptoms?

Thanks
Landry

Edited by Landry 7/4/2011 6:11 PM