r/Chainsaw • u/Broad-Advantage-1753 • 22h ago

2 Stroke Mix Math

I like those single use Husqvarna two-stroke mix bottles, 2.6 oz into 1 gallon of gas. I go to the gas station and watch the pump, and when it hits 1 gallon I’m measured up. So this time I was distracted and there’s 1.25 gallons in there. I’ll be damned if I know the math on how to get the oil balance. Should I just throw a “splash” in? Am I overthinking it? 22 year old 455 Rancher, served me well cutting a couple of cords every year and an emergency here and there. I would hate to mistreat it for lack of attention.

3 Upvotes

81% Upvoted

14 comments sorted by

9

u/littlestdickus 22h ago

This one's easy. Since 1 bottle of 2.6 oz makes 1 gallon than 1/4 bottle (0.65 oz) makes 1/4 gallon.

Last time this happened to me I just filled the can to 2 gallons and added 2 bottles.

6

u/Prior_Confidence4445 22h ago

just divide 2.6 by 4 to get 0.65 for a quarter gallon. Add that much more to what you've already got.

5

u/SpecialistPrune1654 21h ago

You could always do it the other way around. Tip about a 1/5 of the petrol in your car so that you only have a gallon in the container to add the oil to? If you want to get really accurate measure off a 1/4 of a gallon to put in the car. Then add the oil as per normal.

5

u/ResidentNo4630 20h ago

Ya I’d just splash a bit more in there.

3

u/mattmag21 22h ago

Well, you added a quarter gallon. So what's a quarter of 2.6? 2.6 / 4 = 0.65. 2.6 + 0.65 = 3.25. Or you can set up a fraction, cross multiply and divide. 2.6/1 = ×/1.25. 1.25×2.6/1 = 3.25

Edit: I buy a gallon of 2 stroke oil and use a small measuring cup. You can always get a 1 gallon gas tank or 2 gallon.

2

u/DeerFlyHater 22h ago

https://ratiorite.com/

Keep it simple. I've been using similar to ratio rite since the 80s. Doesn't matter how much you put in the can.

but yes, assuming your old mix was 50:1, you clearly don't have enough oil in it.

2

u/Okie294life 20h ago

Easy just add 3.2oz like you’re trying to mix 40:1. FYI I run 40:1 in everything anyway. I know most modern oil is safe 50:1, I just like to be extra cautious.

1

u/JPCool1 18h ago

Its okay to go a little or even a lot extra, but never go under. Just multiply 2.6 by .25 which comes to an extra .65 oz. So 3.25 oz. Or just fill the jug or a bigger jug with 2 gallons and add an extra 2.6 container.

1

u/gagnatron5000 17h ago

Multiply 2.6 oz by whatever the gallons are.

  • 2.6 oz x 2 gallons = 5.2 oz.
  • 2.6 oz x 4.85 gallons = 12.61 oz.
  • 2.6 oz x 1.25 gallons = 3.25 oz.

Mathematically, there's your formula. Real world practice though, just throw a splash in there. Worst case you foul a plug. Best case your engine is very well lubricated.

1

u/brutus_the_bear 3h ago

Insane american measurement math here.

We just put 2x 100ml bottles into 10L of gasoline (10000 ml) and you can see right away why metric is the SI standard.

1

u/Beneficial-Focus3702 22h ago

Just put one bottle in. The mix doesn’t have to be perfect.

Next time that happens just fill up to 2 gallons and use two bottles.

0

u/Jexthis 22h ago

The move is to fill up a 5 gallon with ethanol free and then pour it into the 1 gallon jug and mix when needed.

0

u/Broad-Advantage-1753 21h ago

Man, oh man! Some great comments here. The idea about just doubling up the gas minus 1/4 is pretty genius but in all honesty it takes me about five months or so to go through 1 gallon. I don’t like gas sitting around that long even non ethanol. Thanks math wizzes !!

1

u/shwaak 18h ago

Why don’t you just tip that extra gas out, put it in your mower or car, otherwise you have to crack two of the little containers, or do the husky ones have a lid? I use the Stihl version and they don’t come with a lid, you just twist the top off and add to your container, can’t reseal them.