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    Vapor Lock Help

    My 75 horse Mariner occasionly suffers from vapor lock. Does anybody out there have any tips on reducing vapor lock. I have fresh gas with Seafoam in it.
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    Can I increase my rpms?

    My 75 horse Mariner operates at 5000 rpm at wot. My tach redlines at 6000. Can I get more with some adjustment or is that as high as I should run it?
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    Idle Adjustment on rebuilt carb

    I just rebuilt my carbs on my 75 horse Mariner. What is a good setting to start with on my idle screws. This is the first one I've ever done so I am not sure where to start. There are 3 seperate carbs if that helps.
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    75 horse Mariner running rough and cutting off

    While driving out on the lake yesterday my motor just started running rough and cutting off when I put it in idle. I also noticed gas leaking out from under the motor cover. It was also very hard to start afterwards. I also noticed that the primer bulb would not get hard when I would try to...
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    Thermostat location and access on 75 horse Mariner

    Where are the stats located on my 75 horse mariner and how do I check to see if they are working?
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    Weak water stream from 75 horse Mariner

    My '88 75 horse Mariner sprays water from the pee hole instead of a definite stream. The spray is steady and the motor runs great. Do I need a new impeller or could it be something else? Please help.
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    Do I need new spark plugs???

    Yesterday I pulled the spark plugs on my 1988 75 horse Mariner. They were a little oily on the tops and on the threads. They are gapless plugs and are at least 3 years old or more. Is it time for a change and what difference will I see in performance. The motor runs pretty good but doesn't...
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    Best Spark Plugs

    I am looking to replace my spark plugs in my 1988 75 horse Mariner. I am currently using NKG BUWH 2. Is there a better kind for that motor and how can I tell if they need to be replaced by looking at them?
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    75 horse Mariner spraying water from strange place

    I was running my 75 horse Mariner and water was spraying from a small hole from the top of the engine right next to the top spark plug. The hole is in the middle of a raised round part on the back of the engine. The hole is about the size of a finish nail hole and the water stream is very...
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    75 Horse Mariner leaking from lower end

    My 75 horse Mariner is leaking what appears to be lower unit fluid from the water intake holes. Is there some kind of seal that just needs to be replaced or is it likely something more serious going on. Any suggestions out there?
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    75 Horse Mariner stalling and cutting off

    My 75 horse Mariner started to misfire all of the sudden after running great all day. I also noticed that it started dripping gas from under the motor cover at the same time. When running at full throttle it seemed to do fine but whenever I would take it out of gear to idle it would just cut...
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    old gas mix with new gas?

    My fuel tank has about a quarter of a tank of gas from last summer with some stabilizer in it. Should I try to siphon it out, run it out before adding new gas or just fill it up with new gas? My motor is a 75 horse oil injected Mariner
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    no water when using muffs

    My 1988 75 horse Mariner will not pump water when using muffs but pumps fine in the water. Is this normal?
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    carb cleaning

    My 75 horse Mariner starting shutting off after about a minute of wot. Can that be the result of a dirty carb. Can using old gas make the motor do that?When I clean the carb what is the best method?
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    75 horse Mariner wot problems

    I took my boat out for the first time yesterday. It ran great and sustained full speed the first part of the day. After a few hours of fishing when running it at wot it just shut off. It would start back up and after running for a minute or so it would do the same thing. Once it started back...
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    power trim motor removal

    I need to remove the power trim motor fom a 1988 75 horse mariner. Will I need to remove the motor from the transom althogether or will loosening the bolts be enough to get to the back mounting bolt that holds the trim motor in place with an allen wrench. Also is there anyone out there who has...
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    Best spark plugs

    What are the best spark plug to use on a 1988 75 horse 3 cylinder mariner?
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    Power trim not working

    I have a 1988 75 horse Mariner and the power trim is not working properly. When I attempt to trim it up or down it just clicks. In times past I could tap on the trim motor and it would start working. What I did notice is fluid leaking out where the shaft goes into motor. is there some kind...
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    Power Trim Pressure Loss!

    I have a 75 hp Mariner. When trimmed up it slowly comes back down. I noticed grease built up at the top of the cylinder where the shaft goes in. Is there a bad seal somewhere and if so how do I repair it?
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    Problem starting warm motor

    I am having trouble restarting my 75 horse Mariner once I have run it for a while. The first start of the day is always the easiest. After that I have to crank it several times and wait between tries. When it finally starts there is alot of smoke but it goes away and the motor runs great...
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