2000 40hp yamaha 2 stroke PT&tilt. Inline 3 cylinder. The bottom sparkplug has become rusty on the outside of it. 2 sparkplugs above it are clean. swapped the middle plug with the bottom plug and after 2 trips out now, the bottom plug is developing some slight corrosion on it. There is no apparent area where water is entering the engine or exiting anywhere on the block. have noticed a few of the water cover bolts have slight bits of corrosion around the bolts as if they are seeping at the slightest possible amount.
the engine runs fine throughout all rpm ranges, idles fine, doesnt lack power, etc.... havent noticed any performance issues. inside of the plugs are clean, not showing any signs of internal leakage into the cylinders & appear correct in heat range.
-is this a major issue or a small problem thats going to get worse & cost me a ton of money?
im thinking there is the slightest of water leaks around the bottom cylinder with the water cover over the head & the head is fine, but the water cover & gasket may be bad & thats why it runs fine.
please help me with this. Is this a major issue or something that can be fixed or am i worrying myself over nothing? point me in the right direction of appropriate action to take, etc what can happen? what will most likely happen, etc. do i need to get this fixed asap?
the engine runs fine throughout all rpm ranges, idles fine, doesnt lack power, etc.... havent noticed any performance issues. inside of the plugs are clean, not showing any signs of internal leakage into the cylinders & appear correct in heat range.
-is this a major issue or a small problem thats going to get worse & cost me a ton of money?
im thinking there is the slightest of water leaks around the bottom cylinder with the water cover over the head & the head is fine, but the water cover & gasket may be bad & thats why it runs fine.
please help me with this. Is this a major issue or something that can be fixed or am i worrying myself over nothing? point me in the right direction of appropriate action to take, etc what can happen? what will most likely happen, etc. do i need to get this fixed asap?
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