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After running at 4500 rpm, engine started to knock.  Back home removed head, found hole melted thru piston.  What could have caused this problem?

Engine is a 1994 200 hp Johnson Oceanrunner.

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Hello I would verify timing on that cylinder check for restriction in fuel supply hose or carb . I would also verify no air leaks in fuel system and increase high speed jet by .002.thanks Ralph

Ralph, The Outboard Wizard
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