Other read on ---- these guys have excellent recommendations!!!<br />rodbolt and BenC,<br /> Based on your advice, I performed the following maintenence posted earlier - see details below. We just returned form the Maine coast where we ran 250 gals through these motors and they performed perfect!!! Quite a few hours were spent between 1000 and 2000 rpm exploring coves and harbors and the performance difference at those speeds is amazing. The money and time was well spent--- thanks again for all the skilled advice. <br />Earlier post:<br />I cleaned the sensors with Yamaha decarbon using the info from this forum. In an earlier post I had described the meter readings after the clean --- they were too stable and the swing by plugging the #1 cyl bleed hole went from 0.54V to 0.59V and back to 0.53V. Rodbolt seemd to think the sensors were bad and since I don't have the cleaning history (other than the once I cleaned them), I purchased and installed new ones... although I have not re-performed the same test on the new ones. I have a trip coming up where we will be doing some extended running over 4500 rpm and I didn't want to risk a lean run condition.<br />Overall both engines ran fairly well - one had some problems starting while hot. The other surged occasionally. So far here is what I have done this year:<br />- Plug lead caps - found 6 of the 12 bad. Replaced the bad ones<br />- Poppet valve grommets replaced - found one plunger installed backwards<br />- Thermostats tested for correct opening range<br />- New low pressure fuel pumps - all but 2 looked to be original<br />- Found a slight kink in the fuel line on one engine<br />- Found cracked oil pump clip - replaced both<br />- New VST filters, fuel filter and water sep filters<br />- New O2 sensors<br />- Lower unit oil<br />- Water pumps were done last fall<br />- Removed 2 anodes from head - both looked like new
