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  1. H

    fuel filter and primer bulb questions

    I have a 25 4 2003 Mercury, that sat for around 8 months. It ran perfect before, and cranked up and seemed to run fine last weekend. However, after taking off and getting on plane, it died like it ran out of gas after less than a minute on full throttle. I pumped the primer bulb, and it started...
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    carb adjustment on 25 4 stroke

    I looked through the parts diagram for my 2002 Merc 25 bigfoot, and there is no air adjustment screw. I figured it had to be hidden under a metal cap or something, but nothing showed on the diagram. My motor runs good, but vibrates at idle in or out of gear. It runs the same RPM with either plug...
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    Affect of a SS prop over alum with 25hp

    With a 25hp 4 stroke, will you feel a difference with the same pitch and size SS prop over the stock aluminum prop? I have read they are more efficient, but is it a noticable difference?
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    Intermittent smoke, loss of power 25 4st

    I had posted in the prop forum about my 16ft Sundance skiff with a 15 hp 4 stroke, which wouldn't plane. I traded it in for a 2001 25 HP big foot 4 stroke, which looks almost brand new, inside and out. The dealer changed all the oils, and even took the carb apart to clean it. Took it out for...
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    Tricks for removing wet foam?

    My new to me boat has the entire foam core, water logged. Below the deck it is several different compartments. I have cut so far 3 holes in it, to be covered with hatch covers, to get at the foam. This requires working in a tunnel so to speak. I have tried various techiques to get it out, but...
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    Vibration at idle 15hp 4stroke

    I just bought a boat with a 2005 Mercury 15 4 stroke, and it vibrates noticably at idle up to around 1,500 rpm, and then is smooth. I pulled each plug wire off, and it runs the same on either cylinder. The motor starts, runs, and idles good except for this vibration. It make no difference if it...
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    bow hitting on winch roller when unloading

    I just bought this boat a week ago, and noticed the bow rail was damaged. I thought they had hit something, but the seller said you had to watch the winch roller when putting in. Not knowing what he was talking about we launched the boat, and low and behold the bow rail caught on the winch...
  8. H

    15hp mercury 4 stroke prop question

    I just bought a 2005 Sundance skiff, with a 2005 Mercury 15hp 4 stroke engine. This boat weighs 700 lbs (hull only), and is rated for 50 hp max, with 40 recommended. Needless to say, it is underpowered. The prop, which is probably stock, is aluminum and says A12 9P, which I think means the...
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