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Builtnotbought
MMT Member
Joined: Sun Sep 22, 2019 8:27 pm
Posts: 3
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 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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Builtnotbought
MMT Member
Joined: Sun Sep 22, 2019 8:27 pm
Posts: 3
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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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Wchauvin
MMT 1000 Club
Joined: Sat Sep 30, 2017 7:10 pm
Posts: 1872
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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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| Wed Oct 16, 2019 12:41 pm |
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Builtnotbought
MMT Member
Joined: Sun Sep 22, 2019 8:27 pm
Posts: 3
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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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bear river boomer
New Member
Joined: Sun Dec 15, 2019 7:02 pm
Posts: 1
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Re: 18hp duromax rat tail build OP, where did you find those bearing housings/couplers?
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| Sun Dec 29, 2019 9:19 am |
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mudpack
MMT Member
Joined: Tue May 05, 2015 5:21 pm
Posts: 8
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Re: 18hp duromax rat tail build Why is it so many of these interesting threads die such a quick death? ....usually just after three or four posts??
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| Sun Apr 05, 2020 8:07 pm |
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FRANKtheTAU
MMT 1000 Club
Joined: Thu Dec 29, 2011 10:30 pm
Posts: 1386
Location: West TN
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Re: 18hp duromax rat tail build Because that thing probably ran like a turd and he scrapped it.
_________________
40 Backwater SWOMP Lite / 1752 Alweld Mud
6.5 Backwater SWOMP Lite / 1440 PolarKraft
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| Wed Apr 08, 2020 1:34 pm |
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DyingBreed
MMT Member
Joined: Thu Sep 20, 2018 1:27 pm
Posts: 3
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Re: 18hp duromax rat tail build Pound For pound. Single cylinder clone engine duromax 18hp is king . Biggest big bore. and all gx390 hop ups fit. Im running 25 mph on a 1436 w/ modded 18hp mated to a cheap twister
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| Sat Feb 06, 2021 7:50 am |
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Wchauvin
MMT 1000 Club
Joined: Sat Sep 30, 2017 7:10 pm
Posts: 1872
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Re: 18hp duromax rat tail build That’s fast as fuck for that little rig. Good stuff bro
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| Sat Feb 06, 2021 9:08 am |
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