Ounces per gallon 31 cc engine - Ryobi Backpack Blower 25.4cc

the manual shows for a 100 :1 mix the ratio is 4 ounces of oil to 3 gallons of fuel
there are two engines and one is 50: 1 ratio so that would be 8 ounces of oil to 3 gallons of fuel
there is a pdf version workshop manual at www.motoren.ath.cx and it gives the ratios for all of the 4hp suzuki outboards and the oil to use

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

if its 2 cycle the mixture can be several mixes. it should say on the machine. here are the following mixtures that I have- 16-1, 1 gallon of gas to 8 ounces of oil. 32-1, 4 ounces per gallon. 50-1
3 ounces per gallon and 100-1 2 ounces per gallon . most of my 2 cycles are 50-1. hope this helps.

Depends on what you have a gallon of. Water weighs 8.3453 pounds per gallon. Motor oil, being lighter than water, weighs only about 6 pounds per gallon. Other fluids will have varying weights. This is because a gallon is 128 fluid ounces, and a fluid ounce is a measure of volume, not weight.

Hi,

In the USA - 128 ounces = 1 gallon

3.2 US ounces per one US gallon or 4 UK ounces per one UK gallon.

Homelite Mighty Lite engines require the gas/oil ratio to be mixed at 50:1. That is 2.6 ounces of oil per gallon or 1.3 ounces of 2 stroke oil per half gallon of gas. I recommend using synthetic oil. It lubricates much better, allows the engine to run cooler and smokes less.

4 to 6 oz.is plenty

Yours is not a current model and I did not find a manual. The following is an excerpt from a 26cc MightyLite Blower/Vac UT08550/UT08951 "Operator's Manual":
This product is powered by a 2-cycle engine and requires pre-mixing gasoline and 2-cycle lubricant. Pre-mix unleaded gasoline and 2-cycle engine lubricant in a clean 1 gallon container approved for gasoline.
Recommended fuel: This engine is certified to operate on unleaded gasoline intended for automotive use.
Mix Homelite Premium Exact Mix lubricant with gasoline according to the instructions on the package. If Premium Exact Mix lubricant is not available, use a high quality synthetic 2-cycle engine lubricant, mixed at 2.6 oz. per gallon (US).
Do not use automotive lubricant or 2-cycle outboard lubricant.
NOTE: Premium Exact Mix fuel mix will stay fresh up to 30 days. DO NOT mix quantities larger than usable in a 30 day period.
PREMIUM EXACT MIX (50:1)
GasolineLubricant
1 gallon (US) 2.6 oz.
1 Liter 20 cc (20 ml)

1 quart fuel:3/4 ounces of oil = 1 Gallon fuel:3 ounces of oil or slightly less than 43:1. Not what a current manual recommends.
If properly adjusted your blower will operate fine on 50:1 regardless of what the manual reads. HTH
Lou

the correct ratio is 32:1. thats 4 ounces of oil for every gallon of gasoline. if your riding it hard or in very hot wweather, you can even go 28:1, or 5 ounces to a gallon. dont go any less, or you risk damaging your engine. and dont use more then 5 ounces per gallon, or you willl have poor performance. the manufacturers back then reccomended using very high amounts of oil, like a 20:1 ratio, but with our better technology and more advanced oils, that is not neccessary. just remember, either 4 or 5 ounces to a gallon, and both you and your bike will be happy.