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    Water pressure gauge or water temperature gauge?

    Yamahas usually have a separate water jacket cover on the head. If you pull that, you can see if there is corrosion on the cylinder head itself. I am unsure what you meant when you said the pinholes in the water jacket were soldered. Usually, they leak water internally before they leak...
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    New at this need help

    It sounds like you have the new wiring colors. Red is battery power and goes to the "B" terminal. Black is ground and goes to one of the "M" terminals. Purple is ign power and goes to the "I" terminal. Black/yellow is usually the color of the ign killer wire and goes to the other "M"...
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    Merc won't shift regardless of position of the control handle

    That is the issue when installing the gearcase in forward. If the lower shift shaft is not turned all the way CCW, while in forward, the control often does not have enough travel to turn it to neutral. It is best to install the gearcase in neutral. The control also must be in neutral.
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    Coil Testing.

    The primary coil (thin wire) should not have very much resistance. Almost a short. The secondary will have 2K times that resistance.
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    ‘77 Mercury 1150 Compression

    Any tester will work on cylinders 1-5. I was able to unscrew the rubber tip and install a brass elbow, and then the rubber tip, to get #6. Alternatively, remove the four bolts holding the lower cowl to the cowling support and push the lower cowling down.
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    Water pressure gauge or water temperature gauge?

    Possibly a pressure gauge can show high pressure in the cooling water system, from a compression leak. Aluminum in salt water tends to develop ruts and pinholes, over its entire surface. Maybe the original issue has returned in another part of the head? I have never heard of soldering an...
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    1976 mercury 1150 115hp runs on muffs but not in lake

    Carbs should be set to 1-1/2 turn open, and adjusted in the water, from there. Do not exceed the max spark advance of 21*BTDC. After you get her to run, if she still doesn't run well, check the spark plugs for their color. Brown/black are good, but clean is not good. A clean spark plug...
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    how do i test tilt and trim motor on a volvo penta 4.3 gl sx with blue and green wires and no black earth thanks

    I do not have V-P experience, but 2 wire PTT motors get +12VDC on the blue wire and ground on the green wire, to trim up. 2 wire PTT motors get ground on the blue wire and +12VDC on the green wire to trim down. Two PTT relays provide for the switching of polarity on the motor.
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    Water pressure gauge or water temperature gauge?

    What year is the Yamaha? Some Yamaha's had a tendency for the heads to rot out and leak compression into the cooling system, and vice versa. Did you replace the thermostat? Can you run at 5000RPM for short periods, or is 4100RPM the max you can get? A water pressure gauge may help diagnose...
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    Just bought new boat, trouble first time out. Please help.

    To amplify Racer's point, my '59 Fat Fifty had points/magneto ignition and ran on a 24::1 mixture. In those days, we also ran last year's fuel in the spring, without any stabilizer (not invented) and I am sure the ratio was much lower due to evaporation of the gasoline all winter. It made more...
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    1976 mercury 1150 115hp runs on muffs but not in lake

    Sure, Idle RPM should be 600-650 in gear, and 800-900 in neutral. Those motors sacrifice idle quality for quick smooth acceleration, so find an idle RPM you can live with as long as she accelerates smooth. You cannot have both, due to the design of the carbs. Fresh 50::1 fuel helps idle...
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    Water pressure gauge or water temperature gauge?

    Gee, Mark, wouldn't you rather know when the engine was starting to overheat, vs after it does? Just a Q...different strokes and all that.
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    1976 mercury 1150 115hp runs on muffs but not in lake

    After you get the distributor timed, check the timing pointer for accuracy. After that is done, check/set the idle pickup and max spark advance timing events. The idle pickup timing on those distributor models is set by rotating the brass-colored collar on the distributor, to open the carbs...
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    Just bought new boat, trouble first time out. Please help.

    First of all, welcome to the new boat. They seem to know it is the first trip, and do their best to cause trouble. Usually a solid alarm is overheat. Did you rebuild the waterpump before use? You might inspect/replace the thermostats as well. A '95 90HP 'rude should be a 90* or 60* V4, 2...
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    Water pressure gauge or water temperature gauge?

    Water pressure gauge for OBs, especially the inline Mercs which do not have thermostats. If you watch the pressure gauge, you will know when the impeller is wearing out, by the pressure at a certain RPM. My Johnnyrude will peg the 30PSI gauge at high RPM, when the impeller is new. After a few...
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    1976 mercury 1150 115hp runs on muffs but not in lake

    The distributor cap usually has cylinder numbers molded into it, so you can put the spark plug wires on correctly. The distributor cap has to fit on a raised area of the distributor body, so it is on correctly. You can put it on wrong, but it won't completely mate to the metal distributor...
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    Anyone know the part number of this

    That looks identical to the one that came with my '88 SeaRay/MerCruiser. If you get on a parts site like crowleymarine or marineengine and look for accessories for Mercruiser for 1988, you should see one.
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    2000 Sea Ray 190 CC Hull Soft Spot

    Just so you know. When they lay up the hull at the factory, if they do it right, it is real strong for the amount of material used. The factory layup of glass uses very large and long single pieces, which provide the strength. Repairs, IMO, need to be much stronger, since the pieces of cloth...
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    Lube

    A bit of paint thinner on a rag will remove the old grease.
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    115 Johnson v4 2000 trouble staying started oil/gas leak from exhaust

    That motor may have plastic carbs. If so, check the bowls for warping, and replace them if you find it. It will be obvious when you put a straight edge on the bowl mating surface.
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