How do these spark plugs look to you?

[l008com]

They look really good to me but I'm no mechanic. I don't remember when I replaced them last. Might have been a few years ago, might have been 10 years ago.

 

[OKsailorman65]

They look really good to me but I'm no mechanic. I don't remember when I replaced them last. Might have been a few years ago, might have been 10 years ago.

The bottom plug in your hand appears to be getting a bit more fuel burn than the other plugs. Even so, in my experience with boat motors (on my second one) it is good rule of thumb to change plugs every year.

 

[airshot]

Plugs are cheaper than motors so even if they look good, it is only a few bucks to replace them..

 

[racerone]

Look ready to go for 5 more years.-----More important to replace water pump impeller every 5 years in my opinion.----Check oil injection output if equipped with that.------Many good sparkplugs are thrown out.

 

[Chris1956]

They look fine. Those plugs last a real long time. I usually replace them (saltwater) when the hex heads rust, and I use anti corrosion spray on them.