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engine compression and wet spark plug

@Impelled, it is rumored that you may have relevant experience.
 
If the dealer is the seller, put it on them to fix the issue. If they don't fix it you should walk away. These boats are ultra reliable and we have many owners with hundreds of hours and never had an issue. Many other boats out there.
 
They are yamaha dealers. They are very nice to me. They will fix the problem. They said this in not a head gasket. They will change coil and spark plugs. I do not want to make expensive mistake and have a headache. I do not much about boats or engines. I learn something new every day. I know that at one point the engine overheated. Marine mechanic that I brought to check the compression and the boat thinks that is a blown head gasket. Dealer said it is not. I do not know. Thank you all for the info. It helps a lot.
 
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