Where should they be turned to
, No.455 Rancher, 20″ Gas – Powered Chainsaw

Experienced gardeners share their insights in answering this question :
The fuel to oil ratio is 50 to 1. Both mixture screws will need to set somewhat richer, about 1/8 to 1/4 turn each CCW. Proper setting for H is so that a warm engine running full throttle will 4-stroke, but 2-stroke immediately when cutting. L should be set so that the engine idles fairly smoothly, but will ‘follow-the-throttle’ when accelerated. These mixture screws have special ‘D’ shaped heads that prevents owner tampering–only authorized service agencies have the proper tool (I made my own D head driver!). Hope this helps!

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But as a general guide, a fuel-to-oil ratio of 50:1 is recommended for Husqvarna products up to and including 75cc. That comes out to 2.5 fluid ounces of oil per 1 gallon of gas.
A fuel / oil ratio of 50:1 is recommended for all Husqvarna 2-stroke products.
The correct mixing ratio for your Husqvarna is detailed in the warranty handbook. As a general guide, a fuel / oil ratio of 50:1 is recommended in Husqvarna products up to and including 75cc. In certain heavy use applications, models above 75cc may be run on a mix of 33:1.
Use a 32:1 gasoline to oil ratio. One gallon of gasoline combined with 4 oz of two-cycle engine oil.
The fuel and oil mixture should always be 2% (50:1). We recommend that you use Husqvarna oil mixtures.
For a 50:1 ratio of gas to oil, use 2.6 fluid ounces of oil per gallon of gas.
Be sure to use 89 octane or higher unleaded fuel. For best results, use Husqvarna brand two-stroke engine oil that if FD certified. Always mix gasoline and oil in a clean fuel container, not in the chainsaw`s fuel tank. Fill half the amount of gasoline to be used.
Most modern chainsaws, string trimmers, leaf blowers and other small-engine two-stroke equipment recommend a 50:1 oil mix ratio, but some recommend 40:1 and older two-stroke equipment might even call for 32:1.
Mixing ratios

For a mixing ratio of 1 : 50 you need 5 litres of petrol and 0.10 litres (100cm³) of STIHL two-stroke oil.

1:25 = 1 part oil + 25 parts petrol, or 40 ml oil per litre of petrol when using other brands of oil. Any two-stroke engine oil you use in your petrol gardening tool must have the TC classification.
Husqvarna 450-PROMO 450 18-Inch 50.2cc Gas Chainsaw w/ 50:1 Pre-Mixed 2-Cycle Fuel + Oil, Quart, Case/6.
Tips for properly mixing fuel for a chainsaw:

Always mix the petrol and oil in a clean container intended for fuel. Always start by filling with half of the petrol to be used, then add all of the oil, mix (agitate) the fuel mixture and add the remaining petrol. Do not mix more than one month`s supply of fuel at a time.

The fuel and oil mixture should always be 2% (50:1). We recommend that you use Husqvarna oil mixtures.
Husqvarna 450-PROMO 450 18-Inch 50.2cc Gas Chainsaw w/ 50:1 Pre-Mixed 2-Cycle Fuel + Oil, Quart, Case/6.
A: Yes it`s mixed 50:1 and can be used in any 2 stroke engine.

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Husqvarna iz4817 change oil light needs to be reset
ANSWER : The oil change reminder will flash at 49 hrs for 2 hrs then reset itself. It will do this every 50 hrs.

How do u mix the 50/1 ratio oil and gas mixture
ANSWER : Mix 2 1/2 oz of 2 cycle oil into 1 gal of gas

Do I need gas and oil mix – Poulan Super 250a Chainsaw Plate
ANSWER : I think Poulan uses a 40:1 ratio to one gallon of gas, however I have always used 50:1 the same as my sthl saws with no issue. I would rather have more oil mix that to little.

What is ment by 50 to 1 mix
ANSWER : 50 to one is a ratio of fuel to lubricating oil. Typically 50 parts petrol/gasoline to one part two stroke oil.

Oil typically comes in a special plastic bottle that incoporates a measure. Simply squeeze the right ammount of oil into the little chamber and add to 5 litres of gas.

I need the gas mix oil ratio for the Poluan Pro 42…
ANSWER : 40:1 gas to oil ratio.

DCS520 PETROL/OIL RATIO
ANSWER : 40 to one is a good mix

What is the fuel to oil mixture ratio for my gas featherlight weedeater?
ANSWER : Hi,That oil/fuel mixture would be 50-1 or 2.8 ounces per gallon…heatman101

What is the oil and gas mixture ratio for a gas powered leaf blower?
ANSWER : Per http://www.echo-usa.com/faqs/ it 50:1, there is a chart at the site that shows how to mix it.