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 18hp duromax rat tail build 
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MMT Member

Joined: Sun Sep 22, 2019 8:27 pm
Posts: 3
Post 18hp duromax rat tail build
Hey all,

New to the forum and started a new project, so I've been soaking up some info. My 6.5hp Thailand longtail has worked well pushing my 14x36, but its time for an upgrade. I recently got this farm engineered rat tail for $200, it was set up as a chain/sprocket with a 5/8" keyed prop. I'm cutting it down and threading it to fit a 3/4" threaded BPS 9x5 tiger prop and swapping out to a u-joint assembly. Also replaced the some bearings and seals. Finally its being married up to a 18hp Duromax. I'm open to any and all feedback or pointers as this is my first build.

Thanks for the add!


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Fri Oct 11, 2019 10:50 pm
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MMT Member

Joined: Sun Sep 22, 2019 8:27 pm
Posts: 3
Post Re: 18hp duromax rat tail build
Little bit of an update. Whats with the lag time in posting on this forum?


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Wed Oct 16, 2019 6:03 am
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MMT 1000 Club

Joined: Sat Sep 30, 2017 7:10 pm
Posts: 1409
Location: Raceland, Louisiana
Post Re: 18hp duromax rat tail build
Looks like a cool little set up bro. If it gets you to the ducks, then it’s a success for sure bro!

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18x48 Jeremiah built bateau with 40 GTR XD Jeremiah Stage 2


Wed Oct 16, 2019 12:41 pm
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MMT Member

Joined: Sun Sep 22, 2019 8:27 pm
Posts: 3
Post Re: 18hp duromax rat tail build
Finally made a little progress. I cut the tappered 5/8 portion off the end of the shaft, then threaded it to 3/4 #10 to fit the BPS tiger 9x5. Still not sure how well the 18hp will turn that size prop on my 1436 flat bottom, but thats what the BPS website recommends.


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Sun Oct 27, 2019 4:29 pm
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