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New Build....212cc 7 hp Predator longtail ( top speed? )
https://www.mudmotortalk.com/mmt_v2/viewtopic.php?f=6&t=48557		 Page 1 of 1
Author:  DuckyStyle [ Mon Dec 23, 2013 2:34 pm ]
Post subject:  New Build....212cc 7 hp Predator longtail ( top speed? )
Finally done!
Stock ( for now ) Harbor Freight 212cc engine
Direct drive 6ft shaft
7" SPS aluminum prop ( Dont hate unless you wanna buy me a stainless one!) :lol:
11 mph top speed by myself on a 14x36 Duracraft
10 mph loaded with 2 180lb guys and a spare 4 stroke engine
I may try a larger SPS prop, their cheap enough to experiment with!
Any mathmaticians on here that can determine if a bigger prop will help top end?

Appreciate all the info on here about homemade builds cause everybody don't have the spare $$$$$$
to drop on a store bought unit.
Author:  Joel907 [ Mon Dec 23, 2013 4:32 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
How did you get a 7inch sps prop to fit a 3/4 threaded shaft?
Author:  DuckyStyle [ Mon Dec 23, 2013 5:09 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
I had a machine shop make an adapter.
Author:  Mark F. Cheney [ Mon Dec 23, 2013 6:41 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
I run a 7x5 prop with that engine if it is a straight drive with out a reduction to the drive shaft.

Mark F. Cheney
Author:  Trousertrout [ Mon Dec 23, 2013 6:59 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
You will have a SS prop soon. You didn't hit any fish,turtles,frogs or leaves on your test run. I know from experience.Think your prop is oversized now. Need to know rpms
Author:  Joel907 [ Mon Dec 23, 2013 8:27 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
That's really neat so I take it screws on the shaft ?
What's the other end look like I might have one built for mine so I can keep a back up prop in the boat.
Author:  DuckyStyle [ Mon Dec 23, 2013 8:36 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
I guess I need to pick up a tachometer. Think 7" may be too large for 7hp?
It don't bog down at all. I find it kind of odd that it runs dang near the same speed
Loaded down or empty. I would love to see a few more mph out of it eventually.
Author:  DuckyStyle [ Mon Dec 23, 2013 8:56 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
Joel, the 3/4 shaft is smooth at both ends and through bolted with 1/4" grade 8 bolts and lock nuts. The pic of the adapter is before the hole was drilled.
Author:  Trousertrout [ Mon Dec 23, 2013 9:40 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
I would throw a 6 on there to see what happens. Like you said they are cheap so why not. The tach will tell all
Author:  dogyak [ Wed Dec 25, 2013 7:23 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
Author:  DuckyStyle [ Sat Dec 28, 2013 4:56 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
I will try a 6" and see how it goes. I may be expecting too much for a 212cc pushing a 1436 Duracrft!
What size boats are you pushing with a 6" prop? What's kind of speeds are you getting?
Author:  Trousertrout [ Sat Dec 28, 2013 6:08 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
I had a 7" on a 13hp pushing a 1542 around 15mph with 2 guys,dog and decoys
Author:  DuckyStyle [ Mon Jan 06, 2014 11:43 am ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
6" prop just came in! I hope to try it out this weekend and will post an update on speed rather
It be slower or faster. If nothing else, I got a spare now.
Author:  goose-em [ Mon Jan 06, 2014 2:46 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
I think you will find the 6 inch prop to small. Should have ordered the 6.5 inch.
Author:  ghetto [ Mon Jan 13, 2014 8:21 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
Author:  ghetto [ Mon Jan 13, 2014 8:42 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )


Author:  Trousertrout [ Mon Jan 13, 2014 9:08 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
Natty light tall boyz. Woooooooooooooooooooo. Got my 2nd DUI thanks to those back in he day
Author:  Will C [ Mon Jan 13, 2014 10:15 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
Looks good. What did you use for bushings and seals?
Author:  ghetto [ Tue Jan 14, 2014 5:50 am ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
Thanks. Seals and brass bushings from McMaster. Doesn't leak oil and shaft spins freely. I was going to change to bearings if the bushings didn't work but they work fine.
Author:  dillakilla12 [ Tue Jan 14, 2014 6:28 am ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
Author:  ghetto [ Tue Jan 14, 2014 8:33 am ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
My boat weighs 100 pounds. So that's probably a big factor.
Author:  DuckyStyle [ Sun Mar 09, 2014 3:19 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
Update....adjusted the throttle stop on the engine until right before the governor
Kicks in and added a Cheap straight through exhaust. Loud at high RPM .Same 1436 boat with same 7 inch prop with about 200 extra pound in the Boat including my 5 year old son in the front........same GPS.......15 mph...getting better......
Author:  mud slinger 69 [ Sun Mar 09, 2014 3:25 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
Have ran it my yourself since the changes?
Author:  DuckyStyle [ Sun Mar 09, 2014 4:57 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
That is today's speeds, 15 mph
Pissed all the Bass Fisherman off!
Sounds like a single cylinder Harley!
Author:  DuckyStyle [ Sun Mar 09, 2014 5:52 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
Mudslinger- Have ran it my yourself since the changes?

Ahhhh...by myself? No. I will have to try it when I don't have my son with me. Might see 16?
Author:  DuckyStyle [ Sun Mar 09, 2014 5:58 pm ]
Post subject:  Re: New Build....212cc 7 hp Predator longtail ( top speed? )
Oh, and nice build ghetto, I would love to try mine on a lighter/narrower boat and see what it does. I hope to evenually hit 20 mph
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