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Silencing a MK Fortrex?? #14130784 09/15/21 06:15 PM
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rkd Offline OP
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Not intending to start a MK vs MG vs Brand X debate. I have a 3 year old, 112lb Fortrex and am sticking with it. Prior TM was a MG Tour Edition so I am learning the new-to-me brackets/mounting system, prop, etc. My observation so far is the motor isn't exactly quiet. Shaft isn't bent and prop is just fine. Lots of creaking and grinding with normal usage. Are there any little tweaks I can apply to help lessen some of the noise? Specific spots to tighten and/or loosen? Soak the whole thing in PB Blaster? Thanks in advance for the ideas! (I'm ready for the "it'll be much quieter when you throw it in the trash and buy a ghost" comments)

Moritz Chevrolet - 9101 Camp Bowie W Blvd, Fort Worth, TX - Monte Coon (817) 696-2003
Re: Silencing a MK Fortrex?? [Re: rkd] #14130789 09/15/21 06:20 PM
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Earplugs are a dollar at Big Lots.


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Re: Silencing a MK Fortrex?? [Re: rkd] #14130791 09/15/21 06:21 PM
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Is this in calm conditions or only when the front end is bouncing around in waves?


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Re: Silencing a MK Fortrex?? [Re: rkd] #14130811 09/15/21 06:33 PM
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Make sure your skeg is aligned.


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Re: Silencing a MK Fortrex?? [Re: rkd] #14130830 09/15/21 06:54 PM
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rkd Offline OP
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It's the fish that need the ear plugs! They're burying their heads in the grass when I get close. It is a little noisier in the wind/waves but can still grind when it's calm. Happens a lot when I am trying to make a quick "maneuver" around a stump, etc.

Re: Silencing a MK Fortrex?? [Re: rkd] #14130847 09/15/21 07:08 PM
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Spray the spring, mounts and contact points with rem oil. Then align skeg. It’s fairly easy but would recommend watching a video on it. Should be pretty quiet after that.

Re: Silencing a MK Fortrex?? [Re: rkd] #14130868 09/15/21 07:22 PM
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Mine is loud too, they are louder than MG. The shaft doesn't bend when you hit stuff though like an MG.


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Re: Silencing a MK Fortrex?? [Re: rkd] #14130982 09/15/21 08:55 PM
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The first thing I would do with every new motor, is take it to Boras Marine and let him fine tune the motor and they know every trick in the book to make it run smoothly. Most of them that had a reverse back in the day shook the whole boat. They would go in and adjust the brushes to stop that noise also. The rubber cushions under each through the top cap bolt was another key to stop the grind.


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Re: Silencing a MK Fortrex?? [Re: rkd] #14131001 09/15/21 09:14 PM
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It’s the plastic bushings in the pivot joints. They last about a year and you’ll know when they’re REALLY bad when they fall out on the deck.

Re: Silencing a MK Fortrex?? [Re: rkd] #14131144 09/15/21 11:24 PM
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You can loosen the two screws that hold the rear of the motor housing to the main housing. Put the motor on constant speed, about 70%. While the motor is turning, carefully rotate the end housing clockwise and counterclockwise until you find the sweet spot that produces the highest speed and least noise. Many, many owners are not even aware that this adjustment is even possible, much less try to do it.
Two things!

1….don’t get your hands in the way of the prop!!
2….don’t forget to retighten the end housing screws afterwards.

You can also balance the prop using a lawn mower blade balancing stand. File a little off of the heavier blade until the prop is perfectly balanced.


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Re: Silencing a MK Fortrex?? [Re: rj74955] #14131152 09/15/21 11:34 PM
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Originally Posted by rj74955
It’s the plastic bushings in the pivot joints. They last about a year and you’ll know when they’re REALLY bad when they fall out on the deck.




^this, there’s a video on youtube on how to replace them. Horrible design with junk plastic.

Re: Silencing a MK Fortrex?? [Re: grout-scout] #14131190 09/16/21 12:26 AM
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Originally Posted by grout-scout
Originally Posted by rj74955
It’s the plastic bushings in the pivot joints. They last about a year and you’ll know when they’re REALLY bad when they fall out on the deck.




^this, there’s a video on youtube on how to replace them. Horrible design with junk plastic.

Noisiest trolling motor mount in history. The day I finally pulled them off for good was a dang good day, I had 4 of them in my shop and gave them all to a guy I work with, I probably should have paid him to take them.

Re: Silencing a MK Fortrex?? [Re: Donald Harper] #14131330 09/16/21 03:27 AM
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Originally Posted by Donald Harper
The first thing I would do with every new motor, is take it to Boras Marine and let him fine tune the motor and they know every trick in the book to make it run smoothly. Most of them that had a reverse back in the day shook the whole boat. They would go in and adjust the brushes to stop that noise also. The rubber cushions under each through the top cap bolt was another key to stop the grind.


Ha I’m surprised you ever have a troll motor that works after that.

Re: Silencing a MK Fortrex?? [Re: SteezMacQueen] #14131346 09/16/21 05:10 AM
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Originally Posted by SteezMacQueen
You can loosen the two screws that hold the rear of the motor housing to the main housing. Put the motor on constant speed, about 70%. While the motor is turning, carefully rotate the end housing clockwise and counterclockwise until you find the sweet spot that produces the highest speed and least noise. Many, many owners are not even aware that this adjustment is even possible, much less try to do it.
Two things!

1….don’t get your hands in the way of the prop!!
2….don’t forget to retighten the end housing screws afterwards.

You can also balance the prop using a lawn mower blade balancing stand. File a little off of the heavier blade until the prop is perfectly balanced.


This is good unfo. I also use grease on any points that pivot or slide against any other parts. I don't use spray oils, they wash off easy and usually leave things worse off than before you sprayed them. I will say, really check that the prop shaft isn't bent, they bend easier than people think. It only takes a small amount to make a bunch of racket

Re: Silencing a MK Fortrex?? [Re: rkd] #14131466 09/16/21 01:16 PM
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rkd Offline OP
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Thanks to everyone. I saw a Youtube of the process Steez is recommending. I think I can pull that one off. I am not remotely close to being a mechanic so replacing the plastic bushings sounds challenging. I'll look up the videos for it. I'll assume I can take it to someplace like AllStar (closest TM repair shop to me) and they could replace the bushings????

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