White Shadow
Active Member
- Feb 17, 2023
- 128
- Boat Info
- 320 Sundancer 2005
AB Dinghy w/9.9 Merc
Axiom 9 MFD
Kohler Model 5E Generator
- Engines
- Twin Mercury 350 MPI Horizons w/Bravo III Drives
I have a 2005 320 DA with a Koehler 5E generator which would also be circa 2005 (I've had the boat for almost 2 years). I had noticed an apparent sheen in the water from the generator exhaust. I did some reading here on CSR and found a couple of discussions where the suggested fix was to change the spark plugs (and perhaps even try a hotter plug). The logic being that perhaps you're not getting a clean/efficient burn which makes sense (besides it's a cheap fix). I just changed mine and I went with the NGK BPR4ES which was the specific plug suggested in both discussions I had read. Note the plugs I pulled out were Champion RN14YC and they looked relatively OK, just a little bit of black soot on them as would be expected, nothing else look odd on them. Unfortunately this did not seem to resolve the issue - I am still noticing a sheen in the water. As a matter of fact I felt like maybe there was a more noticeable smell of gas fumes in the air around the exhaust too, although I may have been imagining that and/or the wind was still at the time.
Does anyone have any feedback on the choice of spark plugs I used? Is there a better make or model to try? Failing that, is there a suggested next course of action I could try?
Does anyone have any feedback on the choice of spark plugs I used? Is there a better make or model to try? Failing that, is there a suggested next course of action I could try?