Hi,
I believe there is one above the starter motor. If you could take a few pics of the location, it may help me. Also, there are some in the cylinder head as well, so check there, too.
As far as replacement, I attached directions below. They are a tap-in from the factory which may make it nearly impossible to replace. If that is the case, check out a rubber expansion plug. Basically, you push the plug into the opening and then tighten a nut which expands the rubber. They work well as long as everything is clean and dry when installed.
Let me know.
Joe
See pics below.
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Saturday, January 27th, 2024 AT 8:37 PM