Function Overview; Type Plate/Product Serial Number; Fuel - Husqvarna 531RB Workshop Manual

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6.1 Type plate/Product serial number

The product serial number is given on the type plate.
Supply the model name and the article number when
you send an order for spare parts.

6.2 Fuel

6.2.1 To use fuel
CAUTION: This product has a two-stroke
engine. Use a mixture of gasoline and two-
stroke engine oil. Make sure to use the correct
quantity of oil in the mixture. Incorrect ratio of
gasoline and oil can cause damage to the
engine.
6.2.2 Husqvarna alkylate fuel
CAUTION: Do not use gasoline with an octane
number less than 90 RON (87 AKI). This can
cause damage to the product.
CAUTION: Do not use gasoline with more than
10% ethanol concentration (E10). This can
cause damage to the product.
CAUTION: Do not use leaded gasoline. This
can cause damage to the product.
We recommend Husqvarna alkylate fuel for best
performance. This fuel gives less dangerous exhaust
fumes compared to regular fuel. It keeps the engine
clean and increases the engine life. Husqvarna alkylate
fuel is not available in all commercial areas.
Always use new unleaded gasoline with a minimum
octane number of 90 RON (87 AKI) and with less
than 10% ethanol concentration (E10).
Use gasoline with a higher octane number if you
frequently use the product at continuously high
engine speed.
Always use a good quality unleaded gasoline/oil
mixture.
6.2.3 Two-stroke oil
For best results and performance use Husqvarna
two-stroke oil, which is specially formulated for our
two-stroke engines.
If Husqvarna two-stroke oil is not available, you may
use another two-stroke oil of good quality that is
intended for air cooled engines.Contact your dealer
when you select an oil.
Do not use two-stroke oil intended for water-cooled
outboard engines, also referred to as outboard oil.
Do not use oil intended for four-stroke engines.

12 - Function overview

6 Function overview
Gasoline, litre
5
10
15
20
6.2.4 To make the fuel mixture
Note: Always use a clean fuel container when you mix
the fuel.
Note: Do not make more than 30 days quantity of fuel
mixture.
1. Add half of the gasoline quantity.
2. Add the full quantity of oil.
3. Shake the fuel mixture to mix the contents.
4. Add the remaining gasoline quantity.
5. Shake the fuel mixture to mix the contents.
6. Fill the fuel tank.
6.2.5 To add fuel
Always use a fuel container with an antispill valve.
If there is some fuel on the container, remove the
unwanted fuel and let the container dry.
Make sure that the area near the fuel tank cap is
clean.
Shake the fuel container before you add the fuel
mixture to the fuel tank.
6.2.6 To add fuel to the fuel tank
1. Stop the product.
2. Put the product on a flat surface.
3. Loosen the fuel tank cap to release the pressure in
the fuel tank.
4. Remove the fuel tank cap.
5. Fill the fuel tank to 80%.
6. Tighten the fuel tank cap fully.
7. Make sure that there is no leak in the fuel tank.
Two-stroke oil, litre
2% (50:1)
0.10
0.20
0.30
0.40
935 - 001 -

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