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Recent content by Frank O

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    Serial number mystery

    A friend of mine is trying to figure out the serial number and year for his 150HP Mercury outboard. He thinks the year is probably somewhere roughly around 1978, but he can't say for sure. According to an old page on Mercury's website, "The serial number tag is located on the SWIVEL BRACKET...
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    2011 Optimax 250 -- on-the-water fixes

    A year and a half ago I repowered my 21' center console, moving from a 1994 Merc Offshore 3.0 L 225-hp carbureted 2-stroke to a new 2011 Optimax 250. The Optimax now has about 40 hours on it. For a new engine like this, what are the likeliest problems I could fix on-the-water that I'd want to...
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    Flushing an Optimax 250 in the slip

    I have a 21' center console that used to have a 1994 Merc 225-hp carbureted 2-stroke. I keep the boat in a slip (saltwater). A service manager I took the boat to told me that he thought the best way to flush the engine after using it was to tilt the engine up, install a set of muffs with one...
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    Optimax extended warranty upgrade?

    A year ago this month, I bought a new Optimax 250 outboard. There was a promotion going on at the time where I got a free extended warranty (covering five years total) rather than the standard warranty (which I gather is three years?). Recently I got a letter from Mercury offering me to buy an...
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    Thermostat fault on 2011 Optimax 250

    I have a 2011 Optimax 250 that I bought a year ago. During the past year, a system fault has come up pretty consistently, almost every time I take the boat out. It usually happens when the outboard has been running for ~5-10 minutes, and is running at harbor speeds. There's a beep, and a fault...
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    Smartcraft instrument behavior

    I have a 2011 Optimax 250 outboard that I bought new a year ago for my center console. I also got a Smartcraft tach and speedo, and a set of five link gauges. Since then I've noticed that the behavior of the gauges seems off in various ways, mostly having to do with fuel readings. For example...
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