I have a 2000 Seadoo Islandia powered by a Mercury 240 EFI M2 jet drive. Used the boat on Jul 4th and it ran great. Most of the day though, engine was operated at low RPM (lots of no wake zones). Tried to use the boat two days later and it wouldn't start. Starter kicked in but engine wouldn't start. Swapped out a freshly charged 12V starting battery...same result = starter kicked in, engine wouldn't start. Fuses checked out ok. Safety lanyard attached. Reverse gate in neutral position. I could hear electric fuel pump clicking but engine still would not start. Installed 6 x new spark plugs and the engine started lickety split
Old plugs were two years old...blackened with oily residue. I had tried to clean up the old plugs with a wire brush and sand paper at one point but that did no good.
I know the tech manual cautions against running at low RPM for an extended period of time because it can cause low voltage but can someone please answer these questions:
1. Why just replacing spark plugs is enough to get the engine to start;
2. If I can't avoid operating at low RPM, is there anything I can do to mitigate that condition;
3. Should I go back to replacing spark plugs every season.
4. What problem(s) is/are caused by low voltage.
Thanks in advance.
Old plugs were two years old...blackened with oily residue. I had tried to clean up the old plugs with a wire brush and sand paper at one point but that did no good.I know the tech manual cautions against running at low RPM for an extended period of time because it can cause low voltage but can someone please answer these questions:
1. Why just replacing spark plugs is enough to get the engine to start;
2. If I can't avoid operating at low RPM, is there anything I can do to mitigate that condition;
3. Should I go back to replacing spark plugs every season.
4. What problem(s) is/are caused by low voltage.
Thanks in advance.
