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    1969 85hp Starflite, ignition system change???

    I had that ign system on my '59 Fat-Fifty. It worked very well. There was an issue, where if the engine overheated the steel rotor shaft would expand slightly, putting a small crack in the rotor. This allowed voltage to leak to ground, killing the spark. So, if the spark is good out of the...
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    17 vs 19 vs 21 Pitch?

    That same boat, when the engine was new, would lurch forward at 55MPH, when the throttle was firewalled. The top speed was in the late 60s.
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    17 vs 19 vs 21 Pitch?

    My speedboat (16 foot avenger w 1500 Merc) could pull two skiers slalom or on two (with deepwater starts), with a 21P prop. I changed to a 23P prop, and it could not get a single skier out of the water (deepwater start). the motor would not exceed 2000RPM pulling the skier. The takeaway is...
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    Rubberized or Epoxy undercarriage roll on for salt water trailer?

    In that case, use the Rustolium Rusty Metal Primer. It is oil based and has fish oil in it. I recommend you brush it onto firm rust or clean metal. It is pretty soft, so cover it with a light colored, brush on oil paint, so any subsequent rust will show thru, and allow you to address it.
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    82 50 hp tilt and trim

    If the piston seal in the trim cylinder is bad, no pump will make it hold trim. Ditto for the control valve, although, I never had any issue with that item. You may be able to find an old trim cylinder rebuild kit. It will take some looking. Then you will need to isolate the leaking piston...
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    How many very new 4 stroke engines will be running trouble free at age 50 to 75 years old ?

    There is one fly in the ointment. With the advent of computer aided design (CAD), it is much cheaper to design new engines, car bodies etc., than it used to be. This means that OEMs can economically change the design of their products more often, to make them better or cheaper. That means...
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    How many very new 4 stroke engines will be running trouble free at age 50 to 75 years old ?

    Parts availability is tied to demand. Generally, if there is enough demand, someone will make parts. It may not be the OEM, but someone will make it if enough want it. Hence the parts availability for SBC, and even the availability for parts from OB motors from the 50s and 60s. A whole lot...
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    Aluminum jon boat bench removal. Do or Don't?

    That seat also likely has flotation foam inside it. You will want that if you swamp.
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    82 50 hp tilt and trim

    If the motor pumps up under load, then the pump is probably fine. You probably have a bad control valve or leaking piston seals. Both will cause the cylinders to leak down. Crowleymarine shows both as NLA. As far as I know, the control valve is not rebuildable by us amateurs. The cylinders...
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    Rubberized or Epoxy undercarriage roll on for salt water trailer?

    I had a painted trailer in salt water. I sanded and painted with rusty metal primer. That worked somewhat but required a lot of work to maintain. Eventually I bought a galvanized trailer. The difference is night and day. The galvanized metal resists rust, and can be easily touched up with...
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    Acceleration problems

    for the 60*V motors (not sure about the 90* Vee motors), Idle jets are in the throttle bodies, with gaskets and covers over them. Did you clean them? Also, there is an air orifice which can get clogged on the carbs.
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    Tilt/trim assembly

    Take a look at the crowleymarine web site for your engine. They should have new PTT units avail, so at least you can get the part number, and look around for the best price. I bought a new PTT unit for my '93 135HPV6. It was about $950, if I remember right.
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    17 vs 19 vs 21 Pitch?

    If you change to the 19 P prop, your RPMs will likely drop by about 400RPM. You may gain speed, but it is not a certainty Tri-hulls tend to plane pretty flat, also making it hard to trim the bow up for more speed. Modular props are pretty cheap. It may be worth changing to a 19P prop. I...
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    gas from exhaust

    Some motors have a vacuum powered fuel pump. These can leak gas.
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    Required Safety Course

    I am 3 miles south of Toms River. The PP canal has always been an issue with the current and no wake restrictions, but here on the open bay, there is a lot more room to move.
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    Required Safety Course

    Airshot, Here in NJ, we do not get a discount (that I am aware of) for the boating safety course. However, I have seen a large difference in behavior after the boating safety course was mandated, especially in wave runner riders. Most people now drive their boats and wave runners fairly...
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    2005 Mercury 115 ELPTO No Spark

    Mark, Not that it matters much, but battery/coil ignitions often produce 20K volts. CDi was always much higher. An early aftermarket unit we installed on our 1970 Mercury claimed 600,000 volts. It took the battery voltage and stepped it up to 300V, and then sent it thru the ign coil.
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    1969 IMP "Thunder" 20 ft, Restoration

    Gee, I always liked teal for boats. I had a '67 Winner with about the same color for some time. Just my preference. I almost painted my speedboat teal, but the prep work necessary to make (a dark color) it look good was too much. I went with white, so the painting prep was manageable. I...
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    Boat Battery Questions - Cranking

    Gee, without a trolling motor, do you have any other big users for juice? If not two starting batteries is just fine. Two 24 series will work. Two 27 series is probably overkill. If you have any doubt about the condition of the batteries, do what the sailboat skippers do. Start the motor...
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    Engine cranking not catching

    Your motor is likely fuel injected, and it's systems are run by an ECU. You will need to get a service manual on it. Sometimes the ECU will turn off the fuel to the injectors, when it detects an issue. Alternatively, you may have some sort of electrical problem. You might doublecheck any...
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