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Old 07-02-2011, 05:10 PM   #1 (permalink)
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40:1 vs 50:1 for yard trimmer & blower

I've got a string trimmer that specs 50:1 gas/oil mix and a blower that specs 40:1 ratio. Maintaining two gas cans is a pain. Seems like I remember reading a while back that 2-cycle mfgs were converging on 50:1 but I can't find it. I guess 40:1 would be safer if I just picked one.
You guys got any good answers/experience?
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Old 07-02-2011, 05:20 PM   #2 (permalink)
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I've used 1/2 pint per gallon for as long as I can remember. Now they come in small containers and I just dump one in a gallon of gas. To tell you the truth I've never looked at how much is in one.

Years ago I had a small engine repair guy tell me to run premium in all my small 2-cycle engines.
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Old 07-02-2011, 05:31 PM   #3 (permalink)
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1/2 pint is running a pretty rich oil blend. It should be more on the oreder of 1/2 cup per gallon to achieve the 40:1 ratio. If you are going to settle on 1 gas can you should opt for the 40:1 ratio. The weed trimmer will be a bit over lubed, but neither will seize for lack of lubrication.

I've done something similar for years, with no ill effects

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Old 07-02-2011, 05:39 PM   #4 (permalink)
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40:1 for both. More lube a tiny tiny bit. Will last longer.
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Old 07-02-2011, 06:09 PM   #5 (permalink)
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They say the memory is the first to go! I guess that's why I use the premeasured containers now.
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Old 07-02-2011, 06:20 PM   #6 (permalink)
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Quote:
Originally Posted by Mikey_P View Post
They say the memory is the first to go! I guess that's why I use the premeasured containers now.
And it's why I bought 4 cycle yard equipment.
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Old 07-02-2011, 06:28 PM   #7 (permalink)
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If you throw in my chain saw, you get to add 16:1. The three cans in my shed are a pain, but ....

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Old 07-02-2011, 06:30 PM   #8 (permalink)
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Smile small engine gas

Lawrence, at Lowes they sell a Briggs&Stratton Multi Ratio Blend. I have used it for the last couple of years. One gas can for my 32:1, 40:1 and 50:1 small engines.

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Old 07-02-2011, 07:02 PM   #9 (permalink)
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Thanks for all the replies, guys. I'd forgotten all about my chain saw, Ralph. I'll have to check the ratio on it. I'll take a look at the multi-ratio stuff, Dwight. Thanks.
I appreciate the info.
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Old 07-02-2011, 07:07 PM   #10 (permalink)
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It really depends more on the oil, than the engine. Buy 50/1 oil and forget about. There are no design differences between the engines that would matter. I use the same mix in everything, have for 20 yrs, never had an engine seize yet.
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Old 07-02-2011, 07:16 PM   #11 (permalink)
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I use one small container per gallon and use it on all my 2 stroke engines.

I have also recently switched to synthetic oil, to try to prevent the carbs from getting gummed up but haven't been using it long enough to see if it makes a difference.
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Old 07-02-2011, 08:20 PM   #12 (permalink)
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The newer stuff seems to be leaning towards the 50:1 ratio. 40:1 won't likely cause any problems. Provided you use a good oil, not the crap they sell at Wal-Mart. At the shop we use the Stihl HP Ultra for all our 2 cycle fuel needs.
The 2.6 oz. bottle yields a 50:1 ratio with one gallon of fuel. And you do want to use 89 octane for your mix.
The cheap oil tends to not burn as well and leads to clogged exhaust screens in the muffler or even clogged exhaust ports in the head.
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Old 07-05-2011, 07:23 PM   #13 (permalink)
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Howdy,

The more the better. Well, until you foul your plugs.

My Dad always used one gas can and put the fuel in his weed whacked and his push mower. Push mower lasted over 20 years.

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Old 07-05-2011, 08:52 PM   #14 (permalink)
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IMHO, the only 2 stroke oil to use is Yamalube-R. NOT the regular Yamalube. It can be mixed between the 40 and 50:1 ratios just fine, but a retune depending on oil content is probably warranted. I mix mine closer to the 40:1 ratio just to be "safe". As long as my stuff cuts and blows, I'm happy. I don't need to find that last .065 horsepower!

The reason that some tools specify as high as 15:1 is because they were around when all that was available was bean oil based 2 stroke oil. The synthetics can be mixed much thinner and still be safe. This also gives you more power and better "milage" because less oil means more space for fuel, and therefore a leaner mixture to get the correct burn. Even if it's labeled 15:1, you can, most likely, run it at 40:1 with the newer synthetics. My quads specified 20:1 and had absolutely ZERO issues running about 45:1 with the Yamalube R.

The octane of the fuel required, like in a 4 stroke is fully dependent upon what the compression ratio is. All my Stihl equipment seem to run fine on 87 and have for years and years.
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Old 07-05-2011, 10:35 PM   #15 (permalink)
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The only thing I'd like to add is if you switch from, say, 32:1, to 50:1, your may need to re-jet the carb due to having more fuel in the mix and therefore, will run rich. When I first learned this it was contrary to my initial thoughts. That being, I have less oil...why am I fouling plugs? The plugs are fouling from more gas is why. A smaller main jet is required most times

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Old 07-05-2011, 11:08 PM   #16 (permalink)
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About 10 years ago, I was doing a very through clean up on a Tecumseh 2-cycle lawn mower. I ordered a new gas tank and some other parts along with a new decal to replace the one that said: 32-1. They sent me a decal (correct part #) that said 50-1.

As Rich said earlier, it's probably the newer 2 cycle oil that does a better job.

That 2 cycle mower, I repaired, was brought into my Tech Ed. shop as a throw away mower about 12 years ago. No internal rebuild and it's still the best hi-torque mower I have that will cut grass up to a foot tall. Slowly.

In most modern gas powered lawn equipment, you can't change the jets, they are fixed.

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Old 07-06-2011, 12:34 AM   #17 (permalink)
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You mix it by what is on the oil can. If its syn oil.. you put less oil in the gas.
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Old 07-06-2011, 12:56 AM   #18 (permalink)
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Go with the one you don't want to screw up. Like has already been stated. More oil means less gas and you will run lean. Less oil will make you run rich.
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Old 07-06-2011, 01:53 AM   #19 (permalink)
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When I lived in Alaska and the mosquitoes were terrible, I found I could sit the the exhaust of my chain saw (16:1 ratio) and it would keep the bugs away. It may have effected my brain cells also, but I can't remember.

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Old 07-06-2011, 02:00 AM   #20 (permalink)
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Quote:
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More oil means less gas and you will run lean. Less oil will make you run rich.
I'm thinking out loud here but won't the oil burn too and help to keep combustion at a lower temperature then if it were a pure leaner gas mixture?

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Old 07-06-2011, 04:33 PM   #21 (permalink)
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50:1 with the Stihl 2.6 oz bottle here. The reason I do it is because 1) I just bought a new Stihl weed eater and it uses 50:1. My blower wants 40:1. 2) With the tiny carbs these things have and the even smaller orifices for the fuel/oil, more oil may build up or block the orifice and then you're screwed.

In reality, I don't think a small motor is going to care about 40:1 or 50:1. Just mix it to 45:1 and call it a day.
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Old 07-06-2011, 05:08 PM   #22 (permalink)
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50:1 with the Stihl 2.6 oz bottle here. The reason I do it is because 1) I just bought a new Stihl weed eater and it uses 50:1. My blower wants 40:1. 2) With the tiny carbs these things have and the even smaller orifices for the fuel/oil, more oil may build up or block the orifice and then you're screwed.

In reality, I don't think a small motor is going to care about 40:1 or 50:1. Just mix it to 45:1 and call it a day.
I just went through the EXACT same situation, and the same solution. New Stihl weed eater and a well broken in leaf blower. The blower is now easier to start, and runs better.

The Stihl oil is synthetic if that maters
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