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    increasing HP from 20 to 25

    Subject 20 hp Evinrude mid 80's same bore and stroke of 25 hp model. What is possibility of bumping max hp to 25? What parts necessary. Is this just due to increased max RPM?
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    15 horse gargling when trying to power up

    I have a J15RENM been a good runner for a year. Compresses 109 and 111 psi. Lately after trolling around 1.5 knots, it gargles and may die when I open the trottle. Should I suspect a tired fuel pump? or a gummy carb? I use non ethanol premium and near 3oz XD50 per gal. New NGK plugs. It...
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    choosing sonar

    New to fishing, I like gadgets and have aquired a limited run of a down imaging unit. On further reading I find that it has limited choices of frequency, all high, no lower freqs for deep use, no dual cone application. Is this bad for fresh water? Is down imaging just for seeing bottom? I...
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    J15RENM 1992 hot idle

    Is there any truth to the rumor, I was just told, that two different size water pumps were used in this engine? Possibly I was installed with the wrong size at cost of 151 USD to the effect of 215 deg idling temperature. I would hope to get the right stuff from an authorized repair facility...
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    Running hot at troll speed

    I have a 92 15hp J15RENM. I freaked out when it started showing steam when the weather changed so took it to a marine shop. Tech repalced water pump and advised me that the prop shaft was straight. I was concerned because previous owner had hit a log. Tech also stated that I have a very fine...
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    Steaming Exhaust

    I have a '92 15hp Johnson (J15RENM). I have had it for a week. It was preffering to run at higher speed to smooth out, and showed carbon in combustion chambers so I de-carbonized with Seafoam and DeepCreep. I added new L77j4 plugs gapped to .040, re-oriented the low speed needle adj and now...
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    Spark Plugs--conflicting data

    I have the cleanest, preserved '80's Evinrude 4.5hp ever witnessed. It came with .030 over pistons, new hoses, wires, all parts and lables, paint not a smudge or spec of oil on it. But no model/serial tag. The plug wires show a tag reading of L77J4 or M40FFX. It is a type with kill button...
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    propulsion question

    New to boats I am. I have seen a new/used heavy LOWE brand boat for sale. Fishing machine 165-16ft metal, wide "V" with 25hp 4 stroke Mercury. Hull weight is likely to be 955 pounds. Question: is this rig under powered? I think boat is rated to 75hp max.
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