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    NGK BUHW 2622 spark plug replacement?

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    NGK BUHW 2622 spark plug replacement?

    My maintenance is probably overkill but that's something I've done every two years. I just go over the motor check carbs and all fuel lines (replace any suspect), install a new water pump impeller, change the foot oil, and replace the spark plugs. The motor still looks good, runs strong, and...
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    NGK BUHW 2622 spark plug replacement?

    I own a 1987 Mercury 115HP in-line six-cylinder 2-stroke outboard (have owned it since new). I change spark plugs every two years just to keep it running strong. I have now found out that NGK 2622 BUHW spark plugs that I have run all these years are no longer available and would like to find...
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    1987 115 2-stroke in-line six surging at higher RPM?

    My problem seems to be a fuel delivery issue but, could it be a power-pack failing or maybe the trigger? Can someone tell me how to test the power packs and trigger so I can verify that they are in spec? I don't think they are the problem since the engine starts and idles so well. Plus, no...
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    1987 115 2-stroke in-line six surging at higher RPM?

    Rebuilt fuel pump using Quicksilver parts. For being so old the fuel pump was clean and the check valves and diaphragms still appeared in good shape. Reinstalled with new fuel lines and tested under load, no change.
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    1987 115 2-stroke in-line six surging at higher RPM?

    Yes, it is. The original "auto-blend" mixing unit. Could this unit cause fuel starvation?
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    1987 115 2-stroke in-line six surging at higher RPM?

    Just rebuilt the fuel pump and replaced the primary fuel lines and fuel filter. No change.
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    1987 115 2-stroke in-line six surging at higher RPM?

    Just installed a new hose and bulb from the oil reservoir to the engine and a new hose from the tank to the oil reservoir. The 20-gallon tank is a factory-built aluminum below the deck floor and hull mid-ship. I don't have access to an external Mercury tank to try. The bulb pumps up hard and...
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    1987 115 2-stroke in-line six surging at higher RPM?

    Rebuilt pump, new fuel lines, new filter, and no change. Scratching my head and thinking but, nothing's happening? The engine never runs rough while at idle or WOT and doesn't stall out, just runs smooth. When RPMs exceed 4K it drops back to 3K but, still running smoothly with the carbs...
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    1987 115 2-stroke in-line six surging at higher RPM?

    Finally got my parts (all Quicksilver brand parts) in and successfully rebuilt the fuel pump. Changed out all the internal fuel lines under the engine cover and leak tested, no leaks. Hooked up a garden hose with good water pressure to the foot and started the motor. The motor started right...
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    1987 115 2-stroke in-line six surging at higher RPM?

    Thanks, the fuel pump has never been rebuilt so, I guess I should go ahead and do that. Would the pump beginning to go bad be the cause of the WOT RPMs to surge up and down at speed?
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    1987 115 2-stroke in-line six surging at higher RPM?

    Is there some other way to check the fuel pump besides somebody pumping the primer bulb while running? The location of the bulb will make it unsafe for someone to pump the bulb at speed, especially with the boat changing speeds/RPMs.
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    1987 115 2-stroke in-line six surging at higher RPM?

    My old faithful one owner 1987 Mercury 115HP inline six seems to be starving for fuel at higher rpm's. The motor starts right up and idles smoothly without any missings and no fuel leaks. Once the throttle is opened it will immediately jump on plane and run well at 5000 RPMs for a couple of...
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