Johnson 25hp water lower cyl

[spareparts]

I've seen Yamaha's corrode thru the lower water jacket in the head, they would check good on a compression test, but when I ran it, it would miss, finally got bad enough when I was spinning the engine over with the plugs out, it would spit water out of the plug hole. From what I've seen on Johnson, I'd do what every one else suggested and check the head gasket