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Questions about a 98 4stroke

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"Howdy. I bought this 2004 9.8

"Howdy. I bought this 2004 9.8 4-sroke last fall from a guy who said he used it less than two hours for taping his TV show. He had it a small pontoon boat, and I notice that the prop on it is marked 7.5. . .I assume that's the pitch. I don't even see a 7.5 pitch listed on the Tohatsu prop site for that size engine, but it seems to be doing O.K. It's still under ten hours, but in its brief full throttle runs it gets about 600# of boat and passengers almost to 17 mph. I'm worried about over-revving. Should I be?"
 
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