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What is 50 to 1 oil mix compared to 40 to 1 - Craftsman 25cc Gas Line Trimmer

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Hi,
here is a calculator to figure that out...

http://www.csgnetwork.com/oilfuelcalc.html

heatman101

Posted on May 24, 2011

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ST175G, 2 cycle engine, I lost the manual and I cant remember the percentage of the mixing oil and gas. It has been a few years since I did it. Please help. Thank you, Roger


the type of oil to use is 2 stroke oil ( not ordinary engine oil as for cars )and the ratio is 40:1
the engine type is a homelite engine and the ratio can be 40:1 or 50: 1
I prefer to set the ratio as to the smoke produced so if 40:1 produces too much smoke at full rpms , drop it back to 50:1
The correct mix is when there is JUST visible smoke at rpms
definitely no e fuels.

Jun 25, 2016 | Garden

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What happens if you use 40:1 fuel to oil mix in a 50:1 echo pb251 leaf blower engine?


it is always better to use to much oil than not enough, using not enough will cause major damage to the engine. The oil in the gas mix is what lubes the cylinder/rings against the cylinder walls. 40:1 is way lean of oil for a 50:1 mix engine

Aug 12, 2014 | Garden

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Would it be possible for you to let me know what oil /fuel ratio can be made for a CR125cc 2004 HUSQVARNA. well the previous owner had 40:1 yet he may have been trail riding how can i alter my performance...


Yes 40 - 1 mix is a common race mix and if you dont do weekly maintenance and regular rebuilds you would be better at 32-1 33-1 mixes as this is more oil to fuel mix so better lube and lower burn temperature inside the motor.
when changing to higher oil mix make gradual changes to the fuel mix 1 tank at a time and record your ration as your bike will respond to the changes sometimes well sometimes bad but if you do small steps and record the result you will know what mix is best for your area and bike
In short the more oil you can give it and still ride well the better fore engine life (within reason) but you will lose some performance compared to less oil mix like 40 - 1 ratio (race mix)

May 22, 2011 | 2004 Husqvarna CR 125

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What percentage of gas and oil do we mix into craftsman gas trimmer


You don't state how old your unit is. Most of the older units use 40:1 (3.2 oz. oil /gallon of gas or 1.6 oz oil/half-gallon gas). Newer models have tighter tolerances built into the carburetors (per EPA Emissions Standards) and are made to run 50:1 (2.5 oz oil/gallon of gas or 1.3 oz oil/half-gallon gas).
To be safe, I would run the 40:1 mix and use a synthetic 2 stroke oil or at least a blend. If it calls for 50:1 and you use 40:1, the extra lubrication won't hurt a thing.

Apr 22, 2011 | Garden

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Not a problem, just a question: What is fuel/oil mix ratio on this unit? What type of oil? Unleaded gas ok, I'm assuming. thnx!


everything i have seen says 40:1 mix. most saw are 50:1 or 40:1. use 2 cycle oil and mixing instructions are on the bottle. unleaded is ok

Nov 13, 2010 | McCulloch 16 Inch Gas Chain Saw MCC1635AK

1 Answer

Homelite gas trimmer ut20602 from 1998 need oil mix ratio...is it 40:1 or 50:1


Use the 50:1 ratio oil mix.the oil bottle will tell you how much oil that you will need to mix with how much gas you have,40:1 will make the trimmer smoke too much and it will foul plugs prematurely but won't hurt the machine.

Jul 30, 2010 | Homelite Mighty Lite Lawn Trimmer

1 Answer

I just purchased a Stihl 041AV chainsaw and need to know what the gas to oil ratio is. Thanks.


The quick/easy answer: Use Stihl (or comparable) two-stroke engine oil at 40:1. A good name brand gas is less likely to gunk up your engine.

Background:
The old manual recommended Castrol SAE 40 mixed at 20:1 with regular gas.

All the modern Stihl chainsaw manuals recommend using 90+ octane unleaded gasoline mixed with Stihl two-stroke engine oil at a 50:1.

Since this is an older saw that runs at a lower RPM than modern saws, you probably don't want to run it quite as lean as 50:1. 40:1 is going to be about the right mix

If you want a printed manual for your chainsaw, you can request one here.

Chainsaw collectors corner has some other useful specs here.

If this answer was useful, please give it a vote! Thanks.

Jun 14, 2010 | Garden

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I need to know the gas mixture ratio for a craftsman weedwacker


Hello mcguilmd:

>>All Two Stroke Engines will use a 50 to 1 Ratio using Today's Two Stroke Oils. I once had an Old Chainsaw probably from the 1950s, maybe Earlier 70s that had a sticker on it that said to use a 25 to 1 Fuel/Oil Ratio, but that would have been using Two Stroke Oils of the Time Period the Chainsaw was Manufactured. I was having a Problem with Oil Coming Out of the Muffler and Started Decreasing the Oil in the Gas. I Reduced the Oil Until it was a t a 45:1 Ratio and Decided to be Safe, I would Use a 40:1 Ratio Mix. In that Chainsaw I used 50 to 1 Ratio with no problems. Today's Two Stroke Oils compared to Yesteryears are more Efficient at Lubricating. It is like comparing Today's Synthetic Motor Oil to Motor Oils of Decades ago. All the Equipment I use in Landscaping, anything from a Weed Eater, Leaf Blower, Chainsaw, Hedge Trimmer, use 40 to 1 ratio, and I use all types of makes and models, Stihl, Homelite, Husqvarna, Shindaiwa, and Echo, Sears. I mix up a 5 Gallon Fuel can and use it in all of the Equipment for my Customers and for my Landscaping. I like my Fuel/Oil Ratio a Little Heavy, so I use a 40:1 Ratio. The Following was Copied and Pasted here from and MTD E-mail to me when I Asked for the OEMs Suggested Mixture for this Unit. The mixture, as described by the engine manufacturer, is a 50:1 ratio when using the approved types of 2-cycle engine oils.
50:1 ratio is a mix consisting of 2.5 ounces of 2-cycle oil per 1 gallon of gasoline.
The 2-cycle oil used should be approved and have one or more of the following specification titles: NMMA TC-WII, TC-W3, JASO FB, or JASO FC. NOTE: If unsure of the 2-cycle oil specifications, or the oil is not approved, use a 32:1 fuel to oil ratio. This ratio consists of 4 ounces of oil per one gallon of fuel.
NOTE: Always mix 2-cycle fuel oil and fuel in an approved gasoline safe container prior to filling the engine. Make sure to use a separate gas can for this 2-cycle fuel mixture and label it accordingly. Keep in mind that the fuel capacity of these engines normally is less than a gallon, therefore you will have to use this extra oil mixture for multiple fuel fills. Adding a fuel stabilizer will also help to increase the shelf life of fuel.
>>I Suggest Using a 40:1 Ratio and if Oil Starts Coming Out the Muffler then go to a 50:1 Ratio.
Please, Do Not Hesitate, If I Missed Something or you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.

Good Luck

Respectfully

jbridger (John)

May 13, 2009 | Craftsman Garden

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