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Mountainfreik
MMT Member
Joined: Mon Nov 04, 2013 8:15 pm
Posts: 12
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 20hp surfacedrive no speed!!!!! I have built a surfacedrive mud motor witch I thought would be a lot faster than it is. Any idea why it's not. I'm running a 20 hp vanguard brand new. I'm running a chain and sprockets only for cost cause I had it laying around. I'm running 17 tooth top and 17 bottom and a 9.5x9 hill marine prop. My motor is all stock and my boat is a 1448 riveted. Motor weighs about 160ish. When motor is sitting flat with my boat the propshaft is 3" above the bottoms of boat but also can trim way down. Boat goes 12 with me and a friend and the motor seems to be on the governor. If I push the linkage to bypass the governor it'll pick up about 3 mph. Any help to get more speed would be great. The boat get to speed quick then just stops
Thanks
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| Mon Nov 04, 2013 9:25 pm |
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poke_chop666
MMT Pro Member
Joined: Sat Apr 06, 2013 12:07 am
Posts: 487
Location: port barre,la
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Re: 20hp surfacedrive no speed!!!!! Im far from an expert but I believe it has to do with the teeth on ur sprockets. Normally its a bigger on top and way smaller on bottom. That way it turns the prop alot faster than motor. Id change them and see what happens.... sort of like a bike. Big tooth on drive section(motor) less teeth on propulsion section (prop).
_________________
25 yamaha pushing a 1642 welded flat
20 hp go-devil longtail for hunting.
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| Mon Nov 04, 2013 11:10 pm |
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Mountainfreik
MMT Member
Joined: Mon Nov 04, 2013 8:15 pm
Posts: 12
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Re: 20hp surfacedrive no speed!!!!! I ordered a few sprockets yesterday so I'll try that this evening. I don't know much about this so thank u for the help.
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| Tue Nov 05, 2013 7:01 am |
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mud slinger 69
MMT 1000 Club
Joined: Sun Aug 28, 2011 4:27 pm
Posts: 1194
Location: Utah
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Re: 20hp surfacedrive no speed!!!!! Ya want the bigger pulley on the bottom not the top. Try to move the wieght around in the boat. Run it alone and find the sweet spot. Also get a tach for your motor it will help alot.
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We ant just mormons and polyganists we got rednecks too
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| Tue Nov 05, 2013 7:23 am |
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Westi
MMT 1000 Club
Joined: Fri May 29, 2009 2:53 pm
Posts: 1006
Location: TEXAS
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Re: 20hp surfacedrive no speed!!!!! Post up some pics of this homemade rig. Always nice seeing what people come up with.
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| Tue Nov 05, 2013 1:18 pm |
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waterfowl1
MMT Pro Member
Joined: Sun Jul 17, 2011 12:02 pm
Posts: 335
Location: hayward, wi
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Re: 20hp surfacedrive no speed!!!!! u get yur sprockets set right. try a 10x6 or 10x8 prop.
_________________
Wish in one hand and shit in the other, see which one gets filled first.
If yur gonna be stupid, you might as well be smart about it.
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| Tue Nov 05, 2013 4:19 pm |
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Mountainfreik
MMT Member
Joined: Mon Nov 04, 2013 8:15 pm
Posts: 12
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Re: 20hp surfacedrive no speed!!!!! I changed the top sprocket from a 16 to a 19 and picked up a couple mph. It gets up to max speed in about a 100' I was running it with myself and a buddy and 3 dozen decoys. Burlap ect. Still if I push the governor it picks up speed. I think tomorrow I'm gunna try a bigger top sprocket. Ill post a picture of it tomorrow.
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| Tue Nov 05, 2013 10:34 pm |
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USCG4X4
MMT Pro Member
Joined: Fri Sep 14, 2012 5:00 pm
Posts: 281
Location: Brown Deer, WI
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Re: 20hp surfacedrive no speed!!!!! I'm running a belt setup but close to same idea. I have a large pulley on top and small on bottom. I have a 1442 riveted Jon with a 25. Getting 24-25 alone and high teens with two people and hunt load.
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Running a Alumacraft 1442 NCS with a 25 HP Orion surface drive. Not the best, but it works.
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| Tue Nov 05, 2013 10:41 pm |
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USCG4X4
MMT Pro Member
Joined: Fri Sep 14, 2012 5:00 pm
Posts: 281
Location: Brown Deer, WI
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Re: 20hp surfacedrive no speed!!!!!
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Running a Alumacraft 1442 NCS with a 25 HP Orion surface drive. Not the best, but it works.
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| Tue Nov 05, 2013 10:42 pm |
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Mountainfreik
MMT Member
Joined: Mon Nov 04, 2013 8:15 pm
Posts: 12
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Re: 20hp surfacedrive no speed!!!!! Looks good and thanks for the info. What size prop are u running?
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| Tue Nov 05, 2013 11:08 pm |
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waterfowl1
MMT Pro Member
Joined: Sun Jul 17, 2011 12:02 pm
Posts: 335
Location: hayward, wi
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Re: 20hp surfacedrive no speed!!!!! that sure is shinny. you ever use it. haha. what year is yours?
_________________
Wish in one hand and shit in the other, see which one gets filled first.
If yur gonna be stupid, you might as well be smart about it.
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| Thu Nov 07, 2013 4:13 pm |
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