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    missing at mid throttle

    I have a 1986 150 that seems to be missing at about mid throttle .This problem is not present during wot or running slower. Only at mid range. It sound as if is running out out of gas but when I open it up or reduce throttle the miss dissapears and it runs fine. Any ideas ?
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    top carb on 90 merc

    Been messing with a 1983 90 hp for a while. Had it cranking and running good. Now when I pump the primer bulb it does not seems to get gas to the top carb. Before, during priming, it would show a little gas coming out the front of the carb and it would crank and sound great. Any ideas ?
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    question about Venture

    I have a 1983 Venture that I have been working with for a while. The engine is ready, now I am looking at the repairing the floor. I was expecting the entire floor to be suppored with wood, but found after cuting the soft section away from the middle that holds the wiring and hose is the only...
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    water in cylinder

    I been working on a '83 90 hp inline 6 off and on for the llast 8 months. One problem led to another. Put a complete water pump in it and the base assembly did not seem to seal at the bottem. After completing the job the motor crank right up and it started peeing but I found water coming out the...
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    xr4 carbs adjustment

    Have a 1988 xr4 that I rebuilt the carbs the spring of 2011. The manual said the carb adjustment was factory set. It is hard to tell if it running too lean because it has the flat plugs( no electro). Is there a traditional plug for this motor? The top of the pistons had a carbon stain with some...
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    flushing motor

    Been working on an1988 XR4. Doing a few extra things on the cooling.I have had problems with it over heating. After replacing the water pump the pressure is still low (3 to 8 psi). Thinking of a way to flushing from the top down. Can this be done by adapting a water hose to top where the water...
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    xr4 150 compression

    Working on a 1988 150. The compression when the motor is cold is 120 to 119 when the engine is cold. After warning the engine the compression drops to 110 to 100. Which is the most accurate?
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    head gasket?

    My 1986 150 has beening over heating off and on for the last 2 years. Put a water pump kit in it the beginning each spring. I took the spark plugs out and looked at the top of the pistons. One side looks to be too clean. It also will start blowing steam from the pee hole. Compression(119psi) on...
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    changing foot?

    I have a 1986 150 Black max. I believe the foot needs rebuilding. I can get a foot off a 1991 150 Force by Mercury. Will these interchange?
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    coil and switch board

    I have an 1983 90 hp inline six that shows a spark to the plugs one day and the next day has no spark. I can get the coils, switch box and stator from someone, but his motor is a 1996 xr4.Will these parts interchange?
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    failure to ground

    I bought a project boat with a friend. We have been working on it off and on togeather. The last couple of weeks I have been unable to work on it. He was trying to check the compression and did not ground the spark plug wires. He now tells me the motor has no spark to the plugs. this is a 1983...
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    reed valve

    What are some of the symptoms of a bad reed valve? A 1983 90 hp six cylinder will increase revs up and then back down to normal without moving the throttle.
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    engin will not shut off

    While trying to adjust the timing and the carbs on a 1983 90 hp the motor started to rev up and would not shut off after the switch was turned to the off position. Pulling the gas line was how we got it to shut off. We notice the it stopped peeing before it stopped. Any ideas why the motor kelpt...
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    thinking of buying an old boat

    I found an old boat(1983) that has not been in the water since 2008. The motor crank with a little work and sounded ok considering the carbs. What are some things I should check on the fiberglass hull?
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    leaky foot

    I was helping someone replace a water plump on a 1983 90 hp when we were puting the foot back on we noticed a small hole at the upper end of the foot leaking oil. Is this normal or is it a sign of trouble?
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    project boat

    I have bought a 1983 Venture bass boat for a winter project. I am familar with motors but not hull and body work. The boat seem to be in good condition except the floor seems to be a little weak when you stand on it. I am thinking of adding some epoxy or maybe building it up with fiberglass...
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    question about vin number

    I just bought a boat and i am having trouble getting it in my name.I am looking for a identification number or (vin). This is a Venture boat last used in 2007. I have the control number on the tag,but it does not help. Where is the identification number on this boat?
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    powerheads

    I have a problem with my 1986 150 hp overheating. 2 years ago it only ran hot at low rpms and cooled at high rpms. Replaced the stats(which I found it did not have), poppet valve, and waterpump last May. Last summer it would start to pee for about 5 min. and then stop peeing and steam starts to...
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    therostats

    What will happen if I run a 150(v6) without therostats?
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    xr4 over heating

    Having trouble overheating under 2500 rpm. the water pressure was showing 8-10 psi at wot. Replaced the water pump put new gaskets on the poppet valve but did not replace the spring in the poppet valve. Replaced the exhaust manifold gasket thinking a leak was causing the over heating problem...
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