....and now.....spark plugs!!!!!

[dirtman]

I developed a slight miss in my motor....(Mercury 225 Pro XS)...within the last 3 outings and it has been getting worse. Pulled the top 4 plugs yesterday just to see what they looked like and found one missing the "Platinum tipped ground electrode". So off I went back to Harbin this am and picked up 6. At $132 for 6...I handled them with extra care. Everything I have read and heard about changing these plugs in a motor, like mine, has been doom and gloom. Articles and even Chip at Harbin said I needed to remove the lower cowling around the motor to access the two lower plugs...NOT SO. It was a little bit of a chore, but I DID NOT have to remove the cowling. Just took my time and "got er done." Picture of the old plugs.....fourth from the left is the one missing the tip.

[James.Harner]

Man, I thought the plugs for my H.O. were expensive......

[dirtman]

....and make sure you gap them to the correct gap. They do not come pre-gapped just because they are expensive.

[skeet1]

$132 and not pre gaped, what! Lol hope they work out and she purrs like a kitten

[Douger]

Larry! I'm trying to save up to upgrade my electronics; you're milking me dry with all this maintenance stuff. But thank you for them, at 5,000 RPM a bad plug can be a broken engine real quick.

How old were those plugs?