Q: How to set the working radius on the STIHL iMow RMI 422 mower robot after defining the starting point?

The STIHL iMow RMI 422 PC mower robot allows you to set a working radius around the starting points , between 3 meters and 30 meters . This radius is defined after programming (learning) the initial starting point. Operation of the working radius: When the robot mows starting from a starting point to which you have assigned a radius, it first mows the entire circular area defined by this radius around the starting point. Once this area is completely mowed, it continues mowing in the rest of the main area. Steps to set the radius after defining the starting point: Access the robot's touchscreen menu in the “Starting Point Settings” section (section 11.15 of the manual) Select the starting point to which you want to assign a radius (starting point 1, 2, 3, or 4) Set the desired radius between 3 m and 30 m according to the area to be prioritized Confirm your setting Important point: By default, no radius is assigned to the registered starting points. The delimitation of the overall mowing area remains defined by the peripheral wire that you install around the lawn, placed about 28 centimeters from the edge of the area to be mowed. The wire can measure up to a maximum length of 500 meters. The radius assigned to the starting point allows the robot to manage hard-to-reach areas (small sector, isolated zone, etc.) by prioritizing them when starting from this specific point, rather than modifying the general delimitation of the peripheral wire.

Q: How to change the spark plug on the STIHL RM 2 RT lawn mower?

Changing the spark plug on the STIHL RM 2 RT lawn mower: Your lawn mower is equipped with a KOHLER HD675 engine (149 cm³) that uses a spark plug NGK DCPR6E (or the equivalent Champion RA6HC). The electrode gap should be set to 0.76 mm (0.030 inches) according to the manufacturer's specifications. Before you begin: Completely stop the engine and wait for it to cool down if the mower has just been used. Disconnect the rubber cable (terminal) from the spark plug to prevent any accidental restart during the operation. To remove the old spark plug: Use a spark plug wrench of about 20 mm or 21 mm (often included with the mower). Insert the wrench onto the spark plug and gently unscrew it by turning to the left. Remove it without forcing. Preparation and installation of the new spark plug: Before installing the new NGK DCPR6E spark plug, check that the gap between the center electrode and the side electrode is indeed 0.76 mm using a gap gauge or a coin (a 1 euro coin is about 0.77 mm). If the gap is incorrect, gently adjust it by bending the side electrode. Hand-thread the new spark plug into the threads to avoid cross-threading, then tighten it with the spark plug wrench without excessive force (a hand-tight plus a quarter turn with the tool is sufficient). Finalization: Firmly reconnect the cable (terminal) of the spark plug until it is well seated. Test the mower's starting to check that everything works correctly. If the mower does not start or runs irregularly, check that the terminal is properly connected and that the gap is correct. Practical tips: Change the spark plug every 100 hours of operation or once a year. If you are not comfortable with this operation or do not have the appropriate tool, contact an authorized STIHL dealer or a workshop specialized in lawn mowers.

Question 1

How to set the working radius on the STIHL iMow RMI 422 mower robot after defining the starting point?

Accepted Answer

The STIHL iMow RMI 422 PC mower robot allows you to set a working radius around the starting points, between 3 meters and 30 meters. This radius is defined after programming (learning) the initial starting point.

Operation of the working radius: When the robot mows starting from a starting point to which you have assigned a radius, it first mows the entire circular area defined by this radius around the starting point. Once this area is completely mowed, it continues mowing in the rest of the main area.

Steps to set the radius after defining the starting point:

Access the robot's touchscreen menu in the “Starting Point Settings” section (section 11.15 of the manual)
Select the starting point to which you want to assign a radius (starting point 1, 2, 3, or 4)
Set the desired radius between 3 m and 30 m according to the area to be prioritized
Confirm your setting

Important point: By default, no radius is assigned to the registered starting points. The delimitation of the overall mowing area remains defined by the peripheral wire that you install around the lawn, placed about 28 centimeters from the edge of the area to be mowed. The wire can measure up to a maximum length of 500 meters.

The radius assigned to the starting point allows the robot to manage hard-to-reach areas (small sector, isolated zone, etc.) by prioritizing them when starting from this specific point, rather than modifying the general delimitation of the peripheral wire.

Question 2

How to change the spark plug on the STIHL RM 2 RT lawn mower?

Accepted Answer

Changing the spark plug on the STIHL RM 2 RT lawn mower:

Your lawn mower is equipped with a KOHLER HD675 engine (149 cm³) that uses a spark plug NGK DCPR6E (or the equivalent Champion RA6HC). The electrode gap should be set to 0.76 mm (0.030 inches) according to the manufacturer's specifications.

Before you begin: Completely stop the engine and wait for it to cool down if the mower has just been used. Disconnect the rubber cable (terminal) from the spark plug to prevent any accidental restart during the operation.

To remove the old spark plug: Use a spark plug wrench of about 20 mm or 21 mm (often included with the mower). Insert the wrench onto the spark plug and gently unscrew it by turning to the left. Remove it without forcing.

Preparation and installation of the new spark plug: Before installing the new NGK DCPR6E spark plug, check that the gap between the center electrode and the side electrode is indeed 0.76 mm using a gap gauge or a coin (a 1 euro coin is about 0.77 mm). If the gap is incorrect, gently adjust it by bending the side electrode. Hand-thread the new spark plug into the threads to avoid cross-threading, then tighten it with the spark plug wrench without excessive force (a hand-tight plus a quarter turn with the tool is sufficient).

Finalization: Firmly reconnect the cable (terminal) of the spark plug until it is well seated. Test the mower's starting to check that everything works correctly. If the mower does not start or runs irregularly, check that the terminal is properly connected and that the gap is correct.

Practical tips: Change the spark plug every 100 hours of operation or once a year. If you are not comfortable with this operation or do not have the appropriate tool, contact an authorized STIHL dealer or a workshop specialized in lawn mowers.

Question 3

How to adjust the cutting height of the blade on the STIHL RMA 339 C mower?

Accepted Answer

The STIHL RMA 339 C mower features a centralized adjustment lever that allows you to choose from 5 different cutting heights, ranging from 30 mm (Level 1, minimum height) to 70 mm (Level 5, maximum height).

Adjustment steps:

Step 1 - Release the lever: Press the height adjustment lever (1) to slightly pull it away from the mower until the lugs (2) completely release from the lever.
Step 2 - Adjust the height: Raise or lower the entire mower according to the desired cutting height. For a shorter cut, lower the mower. For a higher cut, raise it.
Step 3 - Lock the selection: Firmly press the height adjustment lever (1) towards the mower until the lugs (2) securely click into the lever.
Step 4 - Check the adjustment: The selected cutting height can be read directly at the front lug (3), which indicates the chosen level.

Height ranges: The RMA 339 C model offers 5 cutting levels ranging from 30 mm to 70 mm, allowing you to adapt the cutting height to your needs. Use the lower levels (30-45 mm) for well-maintained lawns, and the higher levels (55-70 mm) for taller or less regular grass.

Important recommendation: The minimum height (30 mm) should only be used on flat and well-maintained lawns to avoid damaging the mower. If the mower struggles to start in the grass, select a higher cutting height. Always ensure that the engine is off before changing the cutting height.

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