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Old 05-14-2012, 01:23 PM   #1
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2 Stroke Outboards

I am presently using a Yamaha 25hp, 2 stroke outboard. I would like to purchase a new 15 hp, 2 stroke. Mainly the reason is weight. I am trying to lighted the chores for me and the admiral to launch the dinghy.
I like the Yamaha, but everywhere I look, they only show the 15hp engine as a 4 stroke. It's still 100 lbs. plus. Any suggestions?
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Old 05-14-2012, 01:38 PM   #2
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Mercury still make 2 strokes. All the OB I have owned have been Merc 2 stroke. Still have the original 1970 Merc OB 140 HP., and its still running strong. I tend to mix the oil on the heavy side which does fowl the pugs quicker but prevents wear.
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Old 05-14-2012, 01:39 PM   #3
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I shopped for a Yamaha 2 stroke in the fall of 2010 and there were some available at a dealership in Florida. I don't recall the name of the place but it kept comming up in dealership searches.
I was fortunate enough however to find a used Yamaha 15 locally (in Ct via Craig's list) that had 5 hours on it for 1800 and I snatched it up.
Keep searching, one will come up.
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Old 05-14-2012, 03:36 PM   #4
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Conventional 2-stroke engines cannot meet the new EPA clean air regulations. The Mercury website only lists 4-strokes in the smaller size.
See: Outboard Engines | Mercury Marine
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Old 05-14-2012, 03:59 PM   #5
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Go south. Yamaha 15 hp 2 strokes are all over Central and South America. You can get Tohatsu 2 strokes in the Caribbean. We see a few Mercury's but parts and service aren't as readily available.
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Old 05-14-2012, 05:22 PM   #6
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Conventional 2-stroke engines cannot meet the new EPA clean air regulations. The Mercury website only lists 4-strokes in the smaller size.
See: Outboard Engines | Mercury Marine
^^^^^^THIS^^^^^

It is not cost effective to put all of the computer stuff on the small 2 strokes when they can make a 4 stroke without it and still be clean.

I think the law went into effect 1/1/10. I found a brand new one in 2/10 with a build date of 12/09...$2200...sold!!!
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Old 05-14-2012, 05:42 PM   #7
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Could someone explain to me (a real rookie when it comes to engines) why 2 stroke vs 4 stroke is desired? I have only 4 stroke tools at home (mower, chipper, snowblower) and know that the oil and fuel are separate systems.

thanks,

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Old 05-14-2012, 05:46 PM   #8
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Could someone explain to me (a real rookie when it comes to engines) why 2 stroke vs 4 stroke is desired?
1. Weight.
2. Can be stored in any position.
3. Weight.
4. Weight.
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Old 05-14-2012, 05:48 PM   #9
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Originally Posted by scarletbison View Post
Could someone explain to me (a real rookie when it comes to engines) why 2 stroke vs 4 stroke is desired? I have only 4 stroke tools at home (mower, chipper, snowblower) and know that the oil and fuel are separate systems.

thanks,

scarletbison
Weight and simplicity....and you never have to change the oil!!!....part of the simplicity I guess. While 2 strokes can be ornery sometimes, they seem to last forever probably because the "oil delivery system" is so consistent....and they are more tolerant of lower compression. I have a leaf blower I can hear the piston banging around in there....piston slap I think it is referred to. And it has run forever and likely will continue to.

2 strokes produce more power out of less displacement because they have a power stroke on each down stroke....one of thereasons they are lighter...and can tolerate lower compression.
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Old 05-14-2012, 05:54 PM   #10
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I love my 4-stroke dinghy. I only ever had a 2 but wouldn't go back. As for weight... think hydraulic deck crane.

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Old 05-14-2012, 08:35 PM   #11
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Mercury 15hp is the same weight as a 9.9 mercury. I have a 25 hp Yamaha 4 stroke on one dingy and the 15 Mercury 2 cycle on the other. The Mercury pull starts easier is faster and has more out of the hole torque and it weighs about 75lb , close to half the weight of the Yamaha. Imagine my surprise when I purchased a new dingy and couldn't register it as an outboard without having a new approved 4 cycle outboard to declare as its power. I ended up registering it as a row boat and got around the DMV, It has oars right. I told them I already had a outboard and was just trying to register the boat. California wouldn't allow me to register the new boat with my old outboard. So if California is taking this stand it will effect every other state before long. I think the Yamaha is more fuel efficient but I'm really not sure of this as the Mercury is so much lighter. The Mercury has throttle handle shifting which when compared to the separate shift lever on the Yamaha is much more convenient. Also with the Yamaha you have to consciously move a release to have the Yamaha tilt or kick back with grounding and the move it again to engage the tilt lock for reverse. That was handled automatically with the Mercury. Expect to pay a premium if you can find a Mercury 15. Think need a hydraulic crane to lift the motor!! My 25hp Mercury 2cycle was lighter than my 25 Yamaha and at least twice as powerful.
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Old 05-14-2012, 08:48 PM   #12
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My buddy just gave away his small merc...that's the same thing I've seen and heard for the last 50 years...

Sorry to merc owners...but never have had any luck with the smaller mercs...say under 75hp.

My yamaha has spent 2 nights underwater (separate occasions) in the last 5 years...still starts on the 1st or second pull. My buddies merc needed to go to the shop every time he wanted it tro start and run smooth.

OK..OK..sorry again to you merc guys...but for every success story your gonna tell me...I got dozens of the opposite.

Years ago the small Johnson/Evinrudes were hard to beat too....nowadays...I go Yammie for 25 and under and there's one of the other brands that I forget for now that is the Yammie supplier or vice versa.
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Old 05-14-2012, 08:59 PM   #13
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Five HP in a compact package:

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Old 05-14-2012, 10:52 PM   #14
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I've had both Yamaha and Merc 15hp. The Yamaha has been a better engine. Basically just more tolerant of the crappy gas we get nowadays. But the Merc was not a bad engine. But I did have to fight with it. The Yamaha has been perfectly reliable.

And FYI...almost all manufacturers' 9.9 and 15hp2 stroke motors are the same weight...they are the same engine with a different fuel system set up. There are conversion kits for the 9.9s I do believe.
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Old 05-14-2012, 10:58 PM   #15
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I am with you on the 2 vs 4 stroke on smaller outboards... especially if it is on a inflatable... the power to weight ratio is a real plus. I had a 10hp yamaha that went under water on many occasions.. even while running wide open and always started easily after a rinse of fresh water. Over 25 hp and the four strokes are in their element. Find a used yamaha smoker that has done light duty in fresh water ... rebuild it if you think necessary and enjoy.
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Old 05-14-2012, 11:02 PM   #16
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I'm getting great service from a 25 year old Evinrude 4.5HP.

Mark, the leak on that motor and utilitarian design screams British design to me. What make is that old 5HP in your picture?
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Old 05-14-2012, 11:14 PM   #17
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Is it not a Seagull???
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Old 05-14-2012, 11:18 PM   #18
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Is it not a Seagull???
one of the more cantankerous outboards ever made... if they weighed a bit more they would of made better anchors than motors!
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Old 05-15-2012, 12:01 AM   #19
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Is it not a Seagull???
Thanks Baker. I just googled "Seagull outboard" and saw that it was British

I guess a picture is worth a thousand words
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Old 05-15-2012, 01:07 AM   #20
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Mercury Reliability

The Yamaha may be more reliable but I hate it. The mercury 15 I have had for 18 years 1 set of plugs. I have a 3,3 Mercury that's 20 years old and it's had a few sets of plugs and a fuel shut off valve. The 25 Mercury I had for about 15 years and it suffered 1 fuel pump diaphragm. The Yamaha I've had 3 years and it has been reliable but it doesn't have anywhere near the power of the 15hp Merc. It will not plane four adults and two dogs in a twelve foot Achilles rib. It barely manages two adults and the two dogs. The Merc will plane the same load easily. The only thing the Yamaha does better is idle quietly. Which it will do for hours. No doubt it's a better trolling motor. I will say I've had the good fortune to all of these above sea level.
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