Sydwayz

iTrader: (1)

Those plugs are toast; yes some worse than others.
How many hours on the engine?

AllDodge

iTrader: (1)

Seeing a bit of oil burn, some rich and some lean
Have injectors cleaned and flow tested

JohanSweden

About 480 hours on engine.
I changed the spark plugs last winter for 2020 season. So they are barely 1 year old.

Okey thank you. But the plug that is all black, feels that it is something wrong there

AllDodge

iTrader: (1)

Could need valve seals

JohanSweden

Two more pictures:

Port side


Starboard side

JohanSweden

On what spark plug/s do you see burned oil?

AllDodge

iTrader: (1)

Not counting the oil on the threads looks could be 7 and 6, but latest pics not as much, but there is some kind of by product. Is that rust down inside 5

JohanSweden

okey, yes it looks like rust down inside. Dont know what the wite stuff is.

Heres some nearby pictures, also nearby picture of the 3 plugs on port side, also with rust inside.

Took the boat up in september and it have been stored in my garage tent since then.

PA.WOODCHUCK

From my rookie opinion,
has injectors been serviced
leak down/compression test
Is it stock exhaust reversion issue?
for only 1 season on plugs U got deeper problems.

SCANDINAVIAN

Have you pressure tested your exhaust? Could be a water leak and the white stuff salt.
My plugs looked like that except the white stuff when my CMI´s gave up. Also as mentioned before, check compression.