Anyone know the fuel mix ratio for a Ryobi Supreme 720.

incorrect fuel / oil ratio
refill with 50 :1 mix
best to use stihl 50:1 oil as that is designed to cover all ratios from 20:1 up to 50:1 mixes

Check on Parts tree.com

the mix is 50:1 so the weight to volume will not matter
if you have a 1 gallon tin the amount of oil will be 1/50 of the gallon
1 gallon =128 oz so a ratio of 50: 1 would be 1 gallon of fuel to 2.6 oz of oil or 1/50 of the gallon calculate the oil required by dividing 128 by the recommended ratio figure (128 divided by 20 or 30 or 40 or 50 to get the oz amount of oil)
the thing is that the mix doesn't have to be exact as long as it is not tool short on the oil
so a mix ratio of between 30:1 to 50:1 will run in 2 stroke engines but a mix of 60:1 will cause problems
A good mix is when you can see a faint oil smoke when operating
too muck smoke and there is too much oil and no smoke too little oil
the major factor is--- do not use e-mix fuels

Hi marius65..
Use the normal mixture for 2 cycle engines
50 to 1 mixture...1 pint of 2 cycle oil to 6 gallons of gasoline
Please rate me
Bud

Most Ryobi products made in the past 5 years use a 50:1 fuel mix. Check the fuel cap to see if it is listed there. The older Ryobi product used a 32: 1 fuel mix ratio and it was usually listed on the sticker that shows you how to work the choke. If in doubt, go with the 32:1 ratio. The only thing it will cause is premature fouling of the spark plug. Too little oil in the mix will cause premature engine wear.

50:1 is 2.6 ounces of 2 cycle mix to each gallon (U.S.) of gasoline.
32:1 is 4.0 ounces of 2 cycle mix per gallon.

I recommend to use a 2 cycle mix that is specifically designed for lawn equipment and contains fuel stabilizer. The ones with stabilizer will usually be .5 ounces larger.

Good luck!

Check the fuel/oil mix ratio you are using. Some Ryobis use a 32:1 mix and some use a 40:1 mix. There isn't much difference there. To be on the safe side, if you machine is possibly running or tuned a little "lean" I would start off with about 4 oz/gallon oil to gas mix. Use synthetic 2-stroke oil also. Your machine will perform much better.

I found a manual for this unit and it states that you use 2.6 ounces of oil mix to 1 gallon of fuel. Did a Google search for fuel and oil mixture ratio and with this calculator it came out to 50:1 mix. Do a Google search yourself and see if this is what you come up with.

Start with 40:1. If it smokes, go to 50:1. Good luck...Lee

standard mix get small botel mix one bottele to 1 gal. gas

50:1