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  1. H

    Intermittent high pitch whine at moderate throttle

    Tohatsu MFS6B 2010. started engine cold. I was running at medium throttle with a large load in the dinghy. i had been running for about 10 minutes when a loud hit pitched whine / screeching started. It seemed to be coming from under the cowling. I slowed, put in neutral and shut down. i did...
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    Leaky float valve

    2010 Tohatsu 6hp 4-stroke. Last season, we had one instance where the fuel was coming out of the carburetor when squeezing the primer bulb. Eventually, it recovered by itself. This season I started by cleaning the entire carburetor including the float, bowl, etc. I checked the float...
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    4-stroke 6hp hesitates on acceleration

    2010 6hp 4-stroke MFS6B This morning this little workhorse was running great getting my RIB with me and my wife onto a plane. We tied up at a dock. Two hours later when we went to return to our big boat - easy start, good idle to 1/4 throttle. Then when I accelerated to full throttle the...
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    Remote shift control is stiff

    I have a side mount Volvo Penta dual action remote control on my sailboat that has become harder to shift over the years, especially between reverse and neutral. The boat is a 2005 used seasonally in New England. There are no good part numbers on the shifter itself, just patent numbers. The...
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    Removing stuck zinc

    I have a 2010 Tohatsu MFS6B. The zinc has been changed before but not by me. The current one seems "ok", but I'd like to change it out so I know just how much is left. Unfortunately, after removing the bolt that holds it in place, I cannot remove the zinc. I tried gently prying around the edge...
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    Charging deep cycle with 60A stock alternator

    A friend has a 2019 Merc 150 4 stroke on his fishing boat. He has two deep cycle FLA batteries for his trolling motor and fish finder, plus a start battery. The boat has a charger that takes 120V for the deep cycle. The Merc charges only the start battery. On my sailboat I use a high output...
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    Dip stick position when checking oil

    I have an important but what may seem like a silly question wrt my MFS6B 6HP. The owner's manual says "Insert the dipstick to the hole completely." before removing to check the level. I have always taken this to mean screwing in completely before removing to check. Is that correct? I ask...
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    Cleaning portable fuel tank lines

    I have a Tohatsu 6HP 4-stroke. The three gallon tank and bulb are from Tohatsu. I am removing and cleaning out the carb for fuel residue. Is it advisable remove the fuel hose from the tank and use something to flush out the hose? If so, are SeaFoam or carb cleaner appropriate? I was concerned...
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    Lower unit pressure test Tohatsu MFS 6B

    ~ 2010 Tohatsu MFS 6B As I drained my gear oil I saw a thin line of milky color. Most of the oil was black. I've not noticed the milky line before when changing gear case oil though sometimes others do this service. I thought I would try a pressure test to verify whether one of the seals has...
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    Proper tank and vent procedures?

    I have a 2006 Tohatsu 6hp four stroke. I bought a Tohatsu tank and hose 18 months ago. I had to replace the engine side hose connector when the O-ring was damaged a month ago. All I had access to was an aftermarket connector. The tank side is the “coax” type. If I disconnect the hose from the...
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    Topping off with Rotella?

    I am out cruising and just checked my Tohatsu 6. With the oil dipstick screwed in the oil is at the bottom mark of the dipstick. The boat yard changed the oil last and I don’t know what was put in. I have some Rotella T 15W-40. Will adding a bit of this be worse than running at the current level?
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    Hard shifting

    My Tohatsu 6 4-stroke is becoming hard to shift. It happened once and I couldn’t get it out of forward. The next morning it was working fine again. It is now about a week later and it is difficult again. It says in gear fine. It still shifts but with a lot of difficulty. Forcing can’t be good...
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    Are Merc and Tohatsu fuel connectors interchangeable?

    I bought a new tank and hose for my Tohatsu 6hp last year from Defender. It is suppose to be OEM. The hose is 3/8. The o-ring seems damaged. Fuel leaks out when pressurizing and air gets in while running. I am in the Bahamas now with difficult access to Tohatsu parts. Even Merc are in limited...
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