stihl br 350 manual

The STIHL BR 350 is a professional-grade backpack blower designed for demanding commercial and residential use. It features a powerful 2-stroke engine, ergonomic harness system, variable speed throttle with cruise control, anti-vibration system, and a robust air tube and nozzle for efficient debris clearing. Below are key sections for safety, features, operation, maintenance, troubleshooting, and specifications.

Features at a Glance

Key components: 2-stroke engine, backpack frame with harness, throttle handle with cruise control, air tube, nozzle, and muffler with spark arrestor.

Safety Information

Read and understand all instructions before operation. Wear appropriate PPE.

1. Personal Protective Equipment (PPE): Always wear safety glasses, hearing protection, long pants, sturdy gloves, and non-slip boots.
2. Operating Area: Keep bystanders, pets, and children at least 15 meters away. Be aware of loose debris that may be blown.
3. Fuel Safety: Refuel in a well-ventilated area with engine stopped and cool. Use only STIHL MotoMix or properly mixed fuel (50:1).
4. Hot Surfaces: Avoid contact with muffler and cylinder during and immediately after operation.

WARNING! Risk of fire, explosion, and serious injury. Do not operate near flammable materials or in enclosed spaces. Carbon monoxide hazard.

Assembly & Preparation

Unpack all parts. Assemble according to illustrations.

1. Attach Harness: Connect shoulder straps and waist belt to backpack frame. Adjust for comfortable fit.
2. Install Air Tube: Push air tube onto engine housing outlet until it clicks securely into place.
3. Attach Nozzle: Slide nozzle onto end of air tube and secure with locking collar.
4. Fuel Mix: Use STIHL MotoMix (pre-mixed) or mix high-quality 2-cycle oil (STIHL HP Ultra) with unleaded gasoline (min. 89 octane) at a 50:1 ratio.
5. Starting Procedure: Place unit on flat ground. Set master control lever to cold start position (choke). Press purge bulb 5-10 times. Pull starter cord briskly until engine fires. Move lever to warm start position and pull to start.

CAUTION! Ensure all fasteners are tight before operation. Do not force parts during assembly.

Specifications

• Model: STIHL BR 350
• Engine Power: 1.3 kW / 1.8 bhp
• Displacement: 35.2 cc
• Idle Speed: 2,800 rpm
• Maximum Air Speed: 75 m/s (168 mph)
• Maximum Air Volume: 750 m³/h
• Sound Pressure Level (LpA): 96 dB(A)
• Sound Power Level (LWA): 112 dB(A)
• Vibration Levels (ah, ahv): 4.5 m/s², 9.5 m/s²
• Dry Weight (without harness): 8.6 kg (19.0 lbs)
• Fuel Tank Volume: 1.0 L
• Oil Tank Volume (for AutoMix): 0.1 L (if equipped)

Controls and Operation

Master Control Lever: STOP (0), Cold Start (Choke), Warm Start/Run (I). Throttle Trigger: Variable speed control. Cruise Control Lever: Locks throttle at desired speed. Purge Bulb: Primes carburetor.

Starting (Cold Engine): Set lever to choke. Press purge bulb. Pull starter cord until engine fires. Move lever to warm start. Pull cord to start. Allow brief warm-up.

Operation: Adjust harness for balance. Use throttle trigger for variable airspeed. Engage cruise control for prolonged use. Direct nozzle at debris at a low angle for best results.

Stopping: Release throttle. Move master control lever to STOP (0).

Fuel & Lubrication

Use only fresh, clean, unleaded gasoline with a minimum octane rating of 89 (RON).

1. Fuel Mix (if not using MotoMix): Mix at a 50:1 ratio. Use STIHL HP Ultra 2-cycle oil. Add oil to an approved fuel can, then add gasoline. Shake well.
2. Refueling: Stop engine and allow to cool. Clean area around fuel cap. Use a funnel. Avoid spilling. Tighten cap securely.
3. Lubrication: Gearbox is lubricated for life. No user service required.

WARNING! Gasoline is extremely flammable. No smoking. Store fuel in approved container away from heat and sparks. Use fuel within 30 days.

Maintenance Procedures

Perform maintenance with engine off and cool. Use only STIHL replacement parts.

1. Air Filter: Clean regularly. Remove filter cover. Tap filter clean or wash in soapy water. Dry completely before reinstalling.
2. Spark Plug: Check and clean every 50 operating hours. Gap: 0.5 mm (0.020 in). Replace if electrodes are worn.
3. Spark Arrestor Screen: Clean every 100 hours. Remove muffler cover. Carefully remove and clean screen with wire brush.
4. Fuel Filter: Replace annually or if clogged. Use filter pick to remove from tank.
5. Exterior Cleaning: Keep unit clean. Use a soft brush or cloth. Do not use high-pressure water.

CAUTION! Never operate with a dirty air filter or clogged spark arrestor. This can cause overheating and engine damage.

Storage Guidelines

Prepare unit for storage if not used for more than 30 days.

1. Drain fuel tank completely and run carburetor dry.
2. Remove spark plug and pour one teaspoon of engine oil into cylinder. Pull starter cord slowly to distribute oil, then reinstall plug.
3. Clean entire unit thoroughly.
4. Store in a dry, well-ventilated, and secure place, out of reach of children.
5. Cover unit to keep dust free.

Tip: Using STIHL MotoMix eliminates the need to drain the fuel system for seasonal storage up to 2 years.

Regulatory Information

This machine complies with relevant EU directives and US EPA Phase 3 emission standards. It features reduced sound and vibration emissions. The spark arrestor muffler is compliant with USDA Forest Service 5100-1c. For genuine parts and service, contact an authorized STIHL servicing dealer. STIHL is a registered trademark of Andreas Stihl AG & Co. KG.

Troubleshooting

Dealer Service: For repairs beyond basic maintenance, contact your authorized STIHL dealer.

Support: Visit www.stihlusa.com or contact your local STIHL dealer for manuals and parts.