landry Posted June 25, 2011 Report Share Posted June 25, 2011 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? Should rpms change at trolling speed when I hit trim button?? 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 Link to comment Share on other sites More sharing options...
ecmilley Posted June 25, 2011 Report Share Posted June 25, 2011 sounds like a charging issue to me, with engine running check idle voltage and at 4000 rpm, should be able to generate 14 volts at 4000 Link to comment Share on other sites More sharing options...
landry Posted June 27, 2011 Author Report Share Posted June 27, 2011 Bought a new battery - took it out and the same trim/rpm problem was there. Motor ran a little inconsistent/rough too it skips at low rpm's once in a while Checked batteries periodically after ripping around full out for 45 minutes - 13+ volts sometimes and 12.5 others???? Finished at 12.7?? I dunno but what I do know is that the rpm/shift problem is new. Last year I blew 3 ignition coils under warranty and I am starting to wonder if this problem is on its way back - before that happened I had a few engine skips similar to what I am seeing now. Ironically, I have a Mazda MPV and it blows ignition coils all the time. Landry Link to comment Share on other sites More sharing options...
ecmilley Posted June 27, 2011 Report Share Posted June 27, 2011 http://www.bbcboards.net/zeroforum?id=53 This board is a great resource for helping find outboard issues Link to comment Share on other sites More sharing options...
Tom McCutcheon Posted June 27, 2011 Report Share Posted June 27, 2011 Just went through this with a 135 Opti. Identical symptoms. After an exhausted search, I found out that these motors are very sensitive to voltage fluxuations. The main connections must be clean and tightened down to the battery posts with a washer and star/lock washer and pliers/wrench. Not just hand tightened with a wing nut. Hope this helps. Tom. Link to comment Share on other sites More sharing options...
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