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Old 06-02-2011, 13:43   #31
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I am a huge fan of my Mercury 4 stroke, so quiet, starts every time - first pull, not super heavy either.
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Old 06-02-2011, 14:00   #32
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Originally Posted by CSY Man View Post
Agreed, HP is HP, that is why I am curious why the Yamaha 4 is considerable more powerful than the Evirude 4:

A 3 knot difference in top speed should equal one or two HP...?

Any other Yamaha 4 owners have the same (pleasant) experience?

It should be mentioned that the latest model of Yahama 4 is a different animal and it shares the innards with the 6 HP and weighs more..My model was new in 2009 and as far as I know, only comes as a 4..
Wow. That's a really big difference when you are talking about such small motors.
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Old 06-02-2011, 14:35   #33
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I really like my 15hp 2-stroke Merc. It is the same basic engine as the 6,8, and 9.9 of its day and weighs "just" 75lbs. (the 6 weighed 73lbs). Because manufacturers will commonly use one design for multiple hp ratings it pays to do some research; in this case the Merc had one of the heaviest 6hp engines and the lightest 15hp engine.

I think we have to move beyond some of the reputation issues. In the more distant past Mercury made all of their own power heads. Then they started using Tohatsu for the smaller engines. The last time I checked the Merc 4-strokes had Yamaha power heads inside them - so it is a bit rich to say that one or the other manufacturer has a better engine...

I too look forward to the day that clean-running fuel injected 2-strokes are available in the smaller sizes...
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Old 06-02-2011, 14:36   #34
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Wow. That's a really big difference when you are talking about such small motors
That is what I said too when I opened up the new motor after the break-in.

Still wondering why or how.

The old Evinurde 4 was peppy enough and I had expected less of a 4-stroke, not more..

The 4 stroke starts easy if being used every day.
If it sits for 4 to 5 weeks before starting it takes a bit more effort.
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Old 06-02-2011, 15:21   #35
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I really like my 15hp 2-stroke Merc. It is the same basic engine as the 6,8, and 9.9 of its day and weighs "just" 75lbs. (the 6 weighed 73lbs). Because manufacturers will commonly use one design for multiple hp ratings it pays to do some research; in this case the Merc had one of the heaviest 6hp engines and the lightest 15hp engine.

I think we have to move beyond some of the reputation issues. In the more distant past Mercury made all of their own power heads. Then they started using Tohatsu for the smaller engines. The last time I checked the Merc 4-strokes had Yamaha power heads inside them - so it is a bit rich to say that one or the other manufacturer has a better engine...

I too look forward to the day that clean-running fuel injected 2-strokes are available in the smaller sizes...
My Merc, which is an 03, has a Tohatsu power head in it
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Old 06-02-2011, 16:27   #36
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Is that one of the small engines, which have been made by Tohatsu for a long time? I was referring to the 9.9hp and up sizes being by Yamaha.
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Old 06-02-2011, 16:36   #37
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Yeah ive heard lots or negative comments about merc however we have owned two mercs and they have both run flawlessly since we got them. the 3.3 blew up but that was me running it without oil and really had nothing to do with the motor, in fact im surprised it ran for 3 months after the no oil incident.

On the other hand we had a Honda 50hp four stroke that was so problematic we pulled it off the boat after a year and sold it. We suspect the previous owner had swapped it but we cant prove this.

after buying new motors we have never had a problem since.
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Old 06-02-2011, 19:30   #38
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Regarding the OP.

Don't give up on your 2 stroke. The problems you are having are not because it is a 2 stroke.

My little Merc 2.5 was one that someone had given up on. It was still shiney new when someone laid it down with salt water in it. The salt water ran up to the cylinder and locked it up tight.

I didn't even need to disassemble it. I simply pulled the plug and the carb and dumped some gas/oil mix in. Then I got the piston broken free by working it back and forth just a little until it spun. I then re-installed the spark plug to see how the compression felt. For some stupid reason I connected the plug wire before pulling the start cord. I didn't put it in water because I didn't plan on it running. It started on the first pull with NO carborator until the residual gas was gone. I still didn't even replace the impeller and have been running it for years now. I don't think I've ever remembered to properly run it out of gas and it may take 2 pulls to start if I let it set for a couple of months.

Point is, my badly neglected little weed whacker 2 stroke starts first time/every time. Yours is supposed to as well.
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