Buddy has a Johnson 4 cylinder that started running like shit. Pulled plugs and found water in one of the cylinders. Pulled head and found a piston and head that looked like its been beat to hell. Wandering what may have caused this. I'm guessing previous owner put wrong plug in and it broke off when piston came into contact with the longer plug. Hoping water is coming from a messed up head gasket but after seeing the piston and head I'm wondering if the cylinder is cracked. He ran the motor for probably six months before he noticed water in the cylinder.

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