Stihl Km 131 R Parts Diagram (2024)

FAQs

What is the fuel mix for a Stihl 131r? ›

All STIHL gasoline-powered equipment uses a 50:1 gas and oil mixture.

First, locate the three adjustment screws on the carburetor body. Turn the "L" screw clockwise until it lightly seats, then back it off counterclockwise one and a half turns. Repeat the same process with the "H" screw. Finally, turn the "LA" screw clockwise until the engine runs smoothly at idle, but doesn't stall.

Your engine requires a mixture of gasoline and engine oil. For health reasons, avoid direct skin contact with gasoline and avoid inhaling gasoline vapor. STIHL recommends the use of STIHL MotoMix.

STIHL recommends that customers use a minimum of 89 octane fuel. If a customer chooses to use a 91 or 93 octane fuel, no damage to the engine will result. However, using an 87 octane fuel could lead to serious engine damage.

Set idle speed adjusting screw, clockwise to increase rpm, counter-clockwise to decrease rpm. Idle rpm range should be 950 to 1050 rpms. Adjust idle mixture by turning idle mixture screw slowly clockwise until the engine runs poorly. Note position.

Runs on a fuel oil mix just like a 2 stroke, but offers the benifits of 4 stroke power. STIHL 4 MIX® engine technology provides fast acceleration, more power, added torque, lower noise, reduced emissions and increased fuel efficiency.

The Stihl KombiSystem is a powerful engine with a choice of KombiTool attachments - whether it's trimming hedges, edging lawns, turning borders or sweeping paths the Stihl KombiSystem will take the effort out of those tough garden jobs.

For professional trimmers, the “R” indicates a loop handle, and all other trimmers have bicycle-style handles.

Where is the serial number on a Stihl FS 131 R? ›

Where do I find my serial number? On homeowner trimmers, it is located on the bar code label on the fan casing. On professional units and brushcutters it is on the bar code label and stamped in the top of the cylinder or main crank case.

Use a 32:1 gasoline to oil ratio. One gallon of gasoline combined with 4 oz of two-cycle engine oil.

If your manufacturer recommends a 50:1 fuel/oil mix, it means you need 50 parts of gas to one part two-stroke oil. To mix one gallon of fuel at 50:1, add 2.6 ounces of two-stroke oil to one gallon of gas, as shown in the chart below.

We recommend a 50:1 mix ratio (20mls oil per 1 litre fuel) when using STIHL 2-Stroke oil. If you're using a different brand of 2-Stroke oil, you'll need to mix at 25:1 (40mls oil per 1 litre fuel).