50 hp Yami 2-stroke rusty plugs

[vin]

Hi all - first time poster here. I've got a 2002 50 hp Yamaha 2-stroke on my V1965 Carolina Skiff - the rig is run in saltwater. I change the plugs every Spring & by season's end the lower 2 plugs have a fair amount of rust on them. The lowest has the most, the bottom half of the middle plug some rust & none on the top plug. So it would seem that water is entering the case from the bottom & spraying up, but I see no spot where water can enter. The gasket is fine & it seems almost impossible for a spray of water to find it's way past the seal at that location. I did notice that the water coolant discharge line runs past that area, so is it possible that I've got a pinhole in the discharge line?

Thank you for your time.

 

[WillyBWright]

Re: 50 hp Yami 2-stroke rusty plugs

If salt water was getting in there, you'd see obvious residue. It's the salt air that's doing it. Champion makes marine sparkplugs that have stainless steel bases. I don't know if they make one for yours, but it would be worth looking into.

 

[vin]

Re: 50 hp Yami 2-stroke rusty plugs

Thanks for the reply willy - never even imagined it could be the salt air. I'll look into the champions.

 

[JUSTINTIME]

Re: 50 hp Yami 2-stroke rusty plugs

use ngk, that is what yami's like