How do i mix the gas/oil on a 25 cc 2 cycle craftsman weed eater

A 4-cycle engine requires regular gasoline whereas a 2-cycle engine requires oil to be mixed with the gas.
A 4-cycle engine requires regular gas in the gas tank and engine oil in another tank. Your owners manual will tell you what grade of oil to pour into the oil tank compartment of the weed-eater.
A 2-cycle engine requires regular gas plus a certain amount of 2-in-1 oil mixed with it. The oil that is mixed into the gas container and shaken together to "mix" the gas and oil before pouring into the gas/oil tank helps to lubricate the moving parts of the engine like the piston movement between the piston and the pistons' wall known as the cylinder wall. Also the oil aids in the creation of a tight seal which causes compression to occur that is responsible for optimum operation of the engine itself. It also provides lubrication to the piston rings and reduces friction as the piston rings push against the cylinder wall.
4-cycle engine oil can be purchased at any oil store like Canadian Tire/Sears/Napa Auto Parts. Just ask for oil for your weed-eater and let them know that your engine requires 4-cycle engine oil. I am sure the service clerk will point you in the right direction.
I hope this helps!Have a great day!

The ratio is 40:1 Just add 3.2 ounces of 2 cycle oil to one gallon of fuel. Be sure to cap off the tank and shake to distribute the oil throughout the fuel before adding to weed eater.

I found the manual for this model weed eater, according to the manual the mixture...
and I quote "This engine is certified to operate on unleaded gasoline. Before operation, gasoline
must be mixed with a good quality synthetic 2-cycle air cooled engine oil designed to be
mixed at a Ratio of 40:1 ...." and I quote once more from the manual "Helpful Tip. To obtain
correct oil mix ration, pour 3.2 ounces of 2 cycle synthetic oil into one gallon of fresh gas."

Hope that helps,
If you like I can send the manual via email if you need it.

:) happy weed thrashing

If you're talking about mixing two-cycle oil with gas for a two stroke motor, always mix it in a gas can then pour it in the weed eater. It's easier to put the oil in the gas can first then fill it with gas to get the two mixed well.

50:1 is 50:1 no matter whose 2 cycle mix you use. 50:1 is 2.6 ounces of 2cycle mix to 1 gallon (US) of gasoline. I recommend strongly to use a brand that contains fuel stabilizer. It will come in a 3.2 ounce bottle...still 50:1. The premium 2 cycle oils will be semi-synthetic or full synthetic and will claim "no smoke"

4 oz of a generic 2-cycle oil to a gallon of fuel is the typical mix.

I hope this helps.

I believe you have the wrong GAS AND OIL MIXTURE. MOST WEED EATERS are a Ration of 90:1 or even less 75:1 For WEEDEATER I would use a 50:1 or if you choose 32:1 should work. Use a good 2-stroke oil. DO NOT USE ANY OTHER OIL> You see the more oil you use the harder it is to start. Don't forget to Pump the fuel Bulb on the side before trying to start it.About 3 x should do it. GOOD LUCK and it is and does effect me when their is death by a LOVED ONE. My prayers are with you! From Mddoc13 ( BOB)

you shouldn't need to mix oil with gas on a four cycle engine. this is for two strokes.

FUELING ENGINE
WARNING: Remove fuel cap slowly
when refueling.
HELPFUL TIP
To obtain the correct oilmix
ratio, pour 3.2 ounces of
2--cycle synthetic oil into
one gallon of fresh gas.
This engine is certified to operate on unleaded
gasoline. Before operation, gasoline must be
mixed with a good quality synthetic 2-cycle
air-cooled engine oil designed to be mixed at a
ratio of 40:1. Poulan/Weed Eater brand
synthetic oil is recommended.Mix gasoline and
oil at a ratio of 40:1. A 40:1 ratio is obtained by
mixing 3.2 ounces (95ml) of oil with 1 gallon (4
liters) of unleaded gasoline. DO NOT USE
automotive oil or marine oil.

Unless it has a tag or decal on it saying it is a 4 cycle then it uses mixed gas/oil at about a 50:1 ratio. Straight gasoline will freeze the piston in the cylinder in mere minutes.