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    Tachometer running backwards

    I have a 1993 Johnson 40hp. The tach was disconnected when I bought the boat. I hard wired the tach plug and ran it to the tach. It ran backwards for some reason. I got my multi meter and checked the wires. Purple is 12v. Ground is good. Grey is 11ish v when running. I thought the tach may be...
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    Prop Ideas?

    I have a 22ft 79' Starcraft Islander. Weighs about 2,200# with fuel and me. Mercruiser 470 with 1.84 MC-1 outdrive. My recommended WOT is 4,200-4,600. New tach (set for 4cyl) Iphone GPS I'm currently using a 3 blade 13 3/4 X 21 and can only achieve 4,300 at 35MPH(30 knots). According to the...
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    Regal 2860 only planes sometimes.

    My neighbor just bought a 2002 Regal 2860 28'. It has twin Volvo Penta 4.3 MPI with duoprops. We had the compression checked and took it for a sea trial. With 5 adults, it would not plane. The mechanic that performed the compression test said it may be the fuel injectors as he had to clean the...
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    Milky oil in driveshaft bellows

    I was gong to change my impeller, pump housing and gimbal bearing today on my MC-1 and discovered milky oil in the driveshaft bellows. The gear oil in the outdrive is clean. I've serviced the outdrive from my Alpha 1 and Alpha 1 Gen 2 and haven't seen this before. There is no oil coming...
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    Mercruiser 470 heat exchanger

    Hello everyone, I have a 79' 3.7 470. Serial# 5388729. I recently installed a 4' heat exchanger and I've been troubleshooting my overheating problem using advice from this great forum. I pulled the raw water hose off the front of the heat exchanger to check the flow. I have the boat in...
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    Five blade prop question.

    Hello, I am new to the forum. I have been researching my question on the forums for a couple of weeks but have not found an exact answer. I have a 19' X 7.5' 1990 Smokercraft Avanti deck boat, 200hp 5.0 Mercruiser, Alpha 1, 1900lbs. I just bought the boat. It came with a 19p five blade...
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