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Calico · Posted: Fri Apr 17, 2009 8:10 pm Post subject: Mariner/Yamaha motors

Hey y'all what do you know about the Mariner outboards made in Japan by Yamaha? The 20hp in particular? I came across one that I think I might run on one of the little boats.
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Coleman_Kayak1 · Posted: Sat Apr 18, 2009 11:36 pm Post subject:

Year?

I have a 1998 40 Yamaha, and aside from a few minor maintenance issues (eg water pump and starter), it has been every reliable. Don't know how much it has in common with the 20 but they seem to be well-built engines in my opinion. Very Happy

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1969 Aluminum V-Hull
1964 Evinrude Lightwin 3hp (Been in family since new)

1985 Gregor Octapon Pontoon Boat
1998 Yamaha C40

Under Construction: Motorized Sufboard
(Hopefully) 10hp Evinrude Powerplant

lark2004 · Swabby Joined: 21 Dec 2005 Posts: 374

how old is it and has it run in Salt water?
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Calico · Posted: Sun Apr 19, 2009 4:16 pm Post subject:

I don't know the year, late 70s-early 80 is my guess... I'll get some numbers. Never seen salt. I've never seen a saltwater motor around here either, there are plenty of nice freshwater motors though Very Happy

I put it on my Shell Lake yesterday and went for a picnic. With the three of us in the boat she really flew! The motor is not too heavy and starts on the first pull. It idles fast and sneezes though. I'd like to find the instructions for timing and mixture adjustments and linc and sinc.

I'll take a GPS and camera next time, I think I'll run this motor all Summer or longer.
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Calico · Posted: Sun Apr 19, 2009 5:17 pm Post subject:

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Pony · Swabby Joined: 18 Dec 2005 Posts: 1191 Location: Wisconsin

Geez....a 20hp on the Shell Lake, I bet you flew.
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lark2004 · Swabby Joined: 21 Dec 2005 Posts: 374

Should be a good motor. They went really well when they were new....so it should still go well.

The only reason I ask about salt is that these motors disolve when exposed to saltwater over a few years.

I had a freind with the 18hp model and the leg just disintergrated when we went to change the water pump. It was scary how easy pieces broke off..... more amazing was that it didn't fall apart when was being used the week beforehand.
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Calico · Posted: Tue Apr 21, 2009 9:16 pm Post subject:

I'm glad I don't have to worry about saltwater eating up my stuff, ice on the other hand...

The boat laid down a nice flat wake at whatever speed I was doing (I don't want to guess). Now I think I could make use of a couple of strakes. Best part, no more spray off the bow!
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Merc_Nut · Posted: Wed Apr 22, 2009 6:58 am Post subject:

Should be a nice little motor Calico. The year is closer to 1976 based on that serial number.

Some Mariner/Yamaha did have corrosion issues in salt water for sure, but you're meticulous in everything you do so no doubt it will last forever for you.

I bought a little late-80's 8hp Yamaha last year, and love it.

lark2004 · Swabby Joined: 21 Dec 2005 Posts: 374

Oh come on... that 30 isn't all that bad. I'm sure you could patch it up with some JB Weld..... Mr. Green

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Wimperdink · Swabby Joined: 18 Dec 2005 Posts: 2328

JB?

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Merc_Nut · Posted: Thu Apr 23, 2009 6:31 am Post subject:

Ha... maybe that's why he is so stiff. He's hardened from being exposed to the atmosphere.

Calico · Posted: Sat Apr 25, 2009 8:52 pm Post subject:

Yikes! Go check your zincs if you leave your boat in the water long.
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Calico · Posted: Sun May 03, 2009 9:31 pm Post subject:

I ran the boat with a GPS today. It went 20mph no problem with wife/kid/picnic/fishing gear/etc. in pretty rough water. I hit top speed of 22.5 without pushing it. I'd like to try different trim angles to find the sweet spot when the water is warmer and I can play around on the river some more. The Shell Lake handles the power pretty well.

The motor idles really poorly though. Idle speed is much too high and it sputters and sneezes quite a bit. I'll have to go through the linkages and carb adjustments to see if I can smooth it out. If that doesn't work I'll rebuild the carb, probably should anyway.

If anyone has access to a manual I'd like to see the linc and sync instructions for this motor.

A couple things I don't like about the motor are the idle quality and the lack of a 'troll' tilt position like my merc has. That comes in really handy idleing over sandbars and for leaving the skeg down as a rudder while running the electric trolling motor. I could probably figure something out to come up with a half-tilt position if I have to.
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Wimperdink · Swabby Joined: 18 Dec 2005 Posts: 2328

consider trying some small trim tabs to get the back end of the shell lake up and on top of the water a bit more. I'll bet you'd hit more like 25 mph on smooth water. I'm confident you could make them either appealing or removeable.

You run shallow enough that every inch counts. It might surprise ya.
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Calico · Posted: Fri May 08, 2009 7:58 pm Post subject:

I've thought about trim tabs or some sort of afterplane a few times but this boat is really not a good planing hull. It is round chined. I think strakes would give me more overall lift than anything else would. Tabs could become a problem drifting backwards in the current if they get caught in the sand or something else. It is pretty common to motor up to the top of a stretch of river and drop the trolling motor to slow drift and work a bank floating backwards dcownstream. It's also pretty common to fall off the back of the boat if it bangs into a stump or log and stops suddenly Laughing

I could bolt the YaMariner to the back of my 12' aluminum if I want to go fast with it Mr. Green

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Wimperdink · Swabby Joined: 18 Dec 2005 Posts: 2328

Calico · Posted: Fri Nov 13, 2009 9:49 pm Post subject:

During the Summer I had done a light tuneup on this motor. New plugs, clean up and adjust the linkages and carb. It runs much smoother now. I don't think it's the motor for the Shell Lake though since it does not have the 'troll' tilt position and it pushes my boat too fast at idle. I like to crawl along as slow as possible sometimes without resorting to the trolling motor when I'm moving from place to place in current. The merc 110 is hard to beat for trolling slow. I think I am going to sell (or trade) the Mariner 20 pretty soon here so if anyone is looking for a motor...
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