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Spark plug corrosion?

4104 Views 15 Replies 5 Participants Last post by  Smackdaddy53
Purchased a boat and motor back in July. 2000 Yamaha 60HP 2 stroke. Of course I did a few things (water pump, spark plugs, etc) and now 5 months later I was just checking under the cowling and I see corrosion around the spark plugs on the block. I had noticed that there was some type of gasket/ putty that was around them the first time I changed them but scraped it off. Anyone have any suggestions on how to stop this or why it’s happening? Maybe water in the cylinders??


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Discussion Starter · #12 ·
Well as ive stated before, im no mechanic! But, i did notice the gasket and mismatched bolts when i purchased the boat. The motor just ran flawlessly on the test ride (and still does) so i went against my gut bc of the deal i got on the boat. So im hoping that ive caught the problem in time, will make the repairs and be a okay here in a few weeks. I do appreciate all the knowledge, never hurts to listen!
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