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    Tachometer Only Reads Correct While Using Power Trim

    I'm trying to figure out why my tachometer would only read correctly while using my power trim. It reads correct at idle but after about 1500-1800 rpm it only reads correct if I'm using the power trim. It doesn't bounce either, if I hold the trim switch down it reads perfectly fine verified with...
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    Mercury 500 Thunderbolt compression readings

    I'm replacing the powerhead on my engine and have found one that seems in good shape and looks pretty clean. Compression readings from top to bottom are 130 145 142 130. I realize that's not within the 10% recommended but still decent numbers I think, as my last one was 100psi +/- 5% across the...
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    Looking for help deciphering boat serial number

    I have a 15' fiberglass boat I'm trying to license and looking for help to decipher the serial number stamped in the transom. Nothing I have come across seems to help but maybe somebody here can figure it out or has seen something similar. It is a Marlin Glascraft boat made sometime in the mid...
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    Mercury 500 labyrinth seals mushroomed

    I wonder if anyone could tell me the cause of the labyrinth rings mushrooming in the reed block. I don't want to spend $160 on a new one if the same thing is just going to happen right away again. I would assume the crankshaft has to much sideways play in it but why. Should I change out the main...
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