Stihl BR 420 Instruction Manual
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Stihl BR 420 Instruction Manual

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STIHL BR 420
Instruction Manual

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Summary of Contents for Stihl BR 420

  • Page 1 STIH) STIHL BR 420 Instruction Manual...

  • Page 2: Table Of Contents

    Guide to Using this Manual ....2 Safety Precautions and Thank you for choosing a quality Working Techniques ......3 engineered STIHL product. Assembling the Blower ..... 9 This machine has been built using Fuel ..........11 modern production techniques and Fueling ..........

  • Page 3: Guide To Using This Manual

    Engineering improvements in different ways: individual components. STIHL’s philosophy is to continually Note or hint which is not essential A bullet marks a step or procedure improve all of its products. As a result, for using the machine, but may...

  • Page 4: Safety Precautions And Working Techniques

    Always observe local safety regulations, tool model by STIHL or are technically in this manual. standards and ordinances. identical. If you have any questions in You must be rested, healthy and in good this respect, consult a specialist dealer.
  • Page 5 Open the fuel cap carefully to allow any Wear heavy-duty gloves, preferably pressure build-up in the tank to release made of leather. slowly and avoid fuel spillage. STIHL offers a comprehensive range of safety clothing and equipment. BR 420...
  • Page 6 – make sure you have a good view of the nozzle outlet at all times. To reduce the risk of tripping or stumbling, do not walk backwards. Always shut off the engine before taking the unit off your back. BR 420...
  • Page 7 Work calmly and carefully – in daylight conditions and only when visibility is good – ensure you do not endanger others – stay alert at all times. BR 420...
  • Page 8 The period of usage is shortened by: combustible fluids. dealer if in doubt. – Any personal tendency to suffer STIHL recommends the use of genuine from poor circulation (symptoms: STIHL spare parts. Such parts have frequently cold fingers, itching). been optimized for the machine and the –...
  • Page 9 – risk of fire due to the fuel. Check fuel cap regularly for tightness. Use only the spark plugs approved by STIHL – see Specifications. Inspect ignition lead (insulation in good condition, secure connection). To reduce the risk of fire due to ignition...

  • Page 10: Assembling The Blower

    (short), as far as lug (9), and rotate it in the direction of the arrow Insert the screw in the nut from the (clockwise) to lock. other side and tighten moderately – the elbow must still turn. see "Guide to Using this Manual" BR 420...
  • Page 11 Tighten down the clamp screw (11). (clockwise) to lock. Fit the nozzle (13) on the end of the blower tube (12) and rotate it clockwise to engage the bayonet coupling. see "Guide to Using this Manual" BR 420...

  • Page 12: Fuel

    MotoMix is not available in all markets. formulated for use in STlHL engines and guarantees a long engine life. If STIHL two-stroke engine oil is not Mixing Fuel available, use only quality two-stroke oil Unsuitable fuels or lubricants or mix designed for use in air cooled engines.

  • Page 13: Fueling

    English Fueling Mix Ratio Storing Fuel STIHL 50:1 two-stroke engine oil: Store fuel only in approved safety-type 50 parts gasoline to 1 part oil fuel canisters in a dry, cool and safe location protected from light and the sun. Other high-quality two-stroke engine...

  • Page 14: Information Before You Start

    The throttle cable reconnects itself any throttle opening between idle speed automatically when the setting lever is (lower stop) and full throttle (upper stop). moved to the idle position. Set the lever to idle position before switching off the engine. BR 420...
  • Page 15 Make sure you have a firm footing: Hold the unit with your left hand on Also use this position if the engine the housing and put one foot against has been running but is still cold. the base plate to prevent it slipping. BR 420...
  • Page 16 Allow engine to warm up clear the combustion chamber. As soon as engine runs: Move the setting lever to the lower stop – the engine settles down to idle speed. Open throttle slightly – warm up engine for a short period. BR 420...

  • Page 17: Operating Instructions

    Turn choke knob to g away from sources of ignition, until you Release the screws (1) and pull need it again. off the filter cover (2). Storing for a long period: see chapter "Storing the Machine". BR 420...

  • Page 18: Adjusting The Carburetor

    Take the prefilter (4) out of the filter cover. If the prefilter is wet, dry it – then knock it out on the palm of your hand or blow out with compressed air. Always replace a damaged prefilter. BR 420...
  • Page 19 – until the engine runs and accelerates smoothly. Start and warm up the engine. Erratic idling behavior Idle setting is too rich: Turn low speed screw (L) clockwise – no further than stop – until the engine runs and still accelerates smoothly. BR 420...

  • Page 20: Catalytic Converter

    (if adjustable) and observance of the Install only suppressed spark plugs specified mix ratio of gasoline and two- of the type approved by STIHL – stroke engine oil are essential to see "Specifications". minimize harmful exhaust emissions and ensure a long catalyst service life.

  • Page 21: Engine Running Behavior

    Have the muffler checked for contamination (coking). STIHL recommends that all maintenance and repair work be carried out by an authorized STIHL dealer. On all spark plugs: If the engine is down on power or does Always press the boot (2) firmly on not run smoothly at maximum RPM, to the spark plug (3).

  • Page 22: Replacing Starter Rope And Rewind Spring

    Tie a simple overhand knot in the end of the new starter rope and then thread the rope through the top of the grip and the rope bushing (7). Refit the cap in the grip. BR 420...
  • Page 23 Use a screwdriver or suitable pliers to install the spring clip (3) on starter post and over the peg on the pawl – the spring clip must point clockwise – see illustration. Go to “Tensioning rewind spring”. BR 420...
  • Page 24 – start outside slowly so that it winds onto the rotor. and work inward. The starter grip must sit firmly in the rope guide bushing. If the grip droops to one side: Increase spring tension by one additional turn. BR 420...

  • Page 25: Storing The Machine

    Thoroughly clean the machine – pay special attention to the cylinder fins and air filter. Store the machine in a dry, high or locked location – out of the reach of children and other unauthorized persons. BR 420...

  • Page 26: Maintenance Chart

    All accessible screws and nuts (not Tighten adjusting screws) Check Anti-vibration elements Have replaced by servicing dealer Check Blower air intake screen Clean Safety label Replace 1) STIHL recommends that this work be done by a STIHL servicing dealer BR 420...

  • Page 27: Minimize Wear And Avoid Damage

    – Filters (air, fuel) precautions, operating and maintenance only by an authorized STIHL servicing – Fanwheel, shredder blade instructions in this manual. This includes dealer. STIHL servicing dealers are able –...

  • Page 28: Parts And Controls

    13 Air filter 14 Antivibration elements 15 Spark plug boot 16 Muffler (with spark arresting screen)* 17 Carburetor adjusting screws 18 Choke knob 19 Starter grip 20 Fuel filler cap Fuel tank Serial number see “Guide to Using this Manual” BR 420...

  • Page 29: Specifications

    English Specifications BR 420 Blower Data Noise and Vibration Data Noise and vibration data are measured Single cylinder two-stroke engine Air velocity at idling and maximum rated speed in a Displacement: 56.5 cm BR 420: 78 m/s ratio of 1:6.

  • Page 30: Special Accessories

    When repairing the machine, only use replacement parts which have been approved by STIHL for this power tool or are technically equivalent. Only use high-quality replacement parts in order to avoid the risk of accidents or damage to the machine.

  • Page 31: Certificate Of Conformity

    ANDREAS STIHL AG & Co. KG Measured sound power level: Badstr. 115 BR 420 107 dB(A) 71336 Waiblingen BR 420 (catalytic converter) 106 dB(A) certify that the new machine described Guaranteed sound power level: below BR 420 108 dB(A) BR 420 (catalytic converter) 107 dB(A)
  • Page 32 English BR 420...
  • Page 33 English BR 420...
  • Page 34 0458 373 0121 B englisch / English...

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