Need some help running down this issue. I have a 2006 Launch 21V with the 325 engine. When out on the water, I see a little bit of smoke coming out of the exhaust, can't tell what color may be more white than blue. It does not smell like gas or oil burning. When surfing behind the boat, it irritates my eyes. There is also a black scum on the back of the boat right at the waterline when I pull it out of the water.
The cap looked really bad, all the plugs were black and dry with carbon deposits, so I replaced the plugs, oil, cap and rotor this weekend. Looked at the valves on one side, and did not see any issues with the seals. Ran it yesterday and just pulled a couple of the plugs, I'm back to black carbon deposits after one trip out. Any ideas on what to check?
Don't think there are any adjustments that can be made to the fuel injection? I do need to do a compression check. It runs fine, just would like to be able to surf.