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20hp go-devil long tail problem
https://www.mudmotortalk.com/mmt_v2/viewtopic.php?f=6&t=5457		 Page 1 of 1
Author:  blacdj [ Mon Oct 19, 2009 1:50 am ]
Post subject:  20hp go-devil long tail problem
im new to this site and new to mud motors .I just bought a 2003 20hp go-devil ,and its on a 1436 almumacraft boat and love it ,it amazes me just how far it will go . boat runs around 20mph with myself,and around 17mph with 2 people .My question was that the boat floats fine when at a idle but it just doesnt seem to get up on a plane and i have to hold the motor down to keep prop in the water when going around a curve is this normal? And when on a plain the back of the boat is barely out of the water ,actually if i lean the wronge way when im turning running wide open the boat will take on alittle water . are there any adjustment to the motor that need to be made? it seems like the motor is pushing the back of the boat down and the nose up instead of running flat.

thanks
Author:  kibb [ Mon Oct 19, 2009 5:30 am ]
Post subject:  Re: 20hp go-devil long tail problem
Yes, bend the cavitation plate up. Only a little bit at a time. About 1/8" increments. That should keep the prop in the water.
Author:  drake11 [ Mon Oct 19, 2009 4:39 pm ]
Post subject:  Re: 20hp go-devil long tail problem
WOW, you’re running a 20 hp on a 1436. :o Isn't the max hp that the manufacture recommends on your 1436 Alumacraft 15 hp and that’s for an outboard. A new 4 stroke 15 hp Mercury weighs 115 lbs, your motor weighs 192 lbs. That’s a lot of weight for the transom on your boat. This might be the reason why you’re getting water over the transom. JMO

I also have a 1436 Alumacraft but I have a 9 hp GDLT on the back. It's not a speed demon but the few times I've run it I've never had a problem with water over the transom.
Author:  12ga [ Tue Oct 20, 2009 6:54 pm ]
Post subject:  Re: 20hp go-devil long tail problem
I have a 20hp on my 1436 rivited jon and she runs just fine. I only get about 18mph with just me, though im #250. Like it was allready stated bend the calv plate and you should be good to go.
Author:  WBG444 [ Tue Oct 20, 2009 7:02 pm ]
Post subject:  Re: 20hp go-devil long tail problem
Author:  b_coonass [ Tue Oct 20, 2009 7:10 pm ]
Post subject:  Re: 20hp go-devil long tail problem
its normal, you just need to bend the end of your cavitation plate up!
Author:  b_coonass [ Tue Oct 20, 2009 7:13 pm ]
Post subject:  Re: 20hp go-devil long tail problem
Author:  drake11 [ Wed Oct 21, 2009 7:19 am ]
Post subject:  Re: 20hp go-devil long tail problem
blacdj wrote,

"And when on a plain the back of the boat is barely out of the water".

I must of mistook that for a bad thing. What was I thinking?

But anyways, sounds like they gotcha squared away. Let us know how it works.
Author:  blacdj [ Fri Oct 23, 2009 1:38 pm ]
Post subject:  Re: 20hp go-devil long tail problem
thank's for all your help.one more question when bending the cavataion plate do i bend just the tip closest to the prop or do i try to bend the whole plate?
Author:  DeathMetalDukk [ Sat Oct 24, 2009 8:24 am ]
Post subject:  Re: 20hp go-devil long tail problem
Author:  bull_sprig [ Sun Oct 25, 2009 7:03 pm ]
Post subject:  Re: 20hp go-devil long tail problem
i'm running a 20 gdlt on a rivited 14/36. i dont have the prop problem, the guy i bought the from had a plate welded to the back, it's about 4" long and runs the width of the cav plate. the problem i have is when i'm turning at slow speeds and lean the wrong way i will swamp the boat really quick. i haven't had water come over the transome when i stop, or any other issues, except that rivited boats aren't made to run higher hp mud motors. i've had to reseat 12 or so rivits. i'm sure the oyster reefs played a big part of the leaking but with that much weight hanging off the back, it does take a toll on the hull. over all, i like the combo, super lite weight as far as mud rigs go, less than 500# loaded minus passengers. i'll keep running it until i finally wear it out or get ticketed for exceding the hp.
Author:  blacdj [ Thu Oct 29, 2009 12:23 am ]
Post subject:  Re: 20hp go-devil long tail problem
im in the process of relocating some weight in my 1436 to try to help with the weight issues. I have allready moved the battery to the front and want to move the gas tank next .I was wanting to know will the motor run with all the extra fuel line or do i have to add a fuel pump to get the fuel to the motor.
thanks for all the helpful info
Author:  earl33 [ Thu Oct 29, 2009 8:21 am ]
Post subject:  Re: 20hp go-devil long tail problem
Author:  blacdj [ Mon Nov 02, 2009 5:43 pm ]
Post subject:  Re: 20hp go-devil long tail problem
went out on a test run this weekend boat did alot better with battery in front and i moved the gas tank from the very back to up there next to me
put a gps on the boat .Me by my self cooler of drinks and normal safety equipment and got 20.8 mph went out the next day same load and added my 9yr old son and got 20.2 mph thats running wide open. Im happy with that
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