Stihl BR 340 BR 420 Instruction Manual

Stihl BR 340 BR 420 manual cover
Pages 74
Year 2005
Language(s)
English en
Spanish sp

Stihl BR 340 BR 420 Specification

The Stihl BR 340 and BR 420 are robust backpack blowers designed for demanding outdoor cleaning tasks. Both models feature a powerful two-stroke engine with a displacement of 56.5 cc, delivering reliable performance for efficient debris clearing. The engines are equipped with an electronic ignition system, ensuring smooth starts and consistent operation. The BR 340 and BR 420 are engineered with a high air velocity and air volume output, optimizing their effectiveness in moving stubborn leaves and debris. The BR 340 offers an air velocity of approximately 166 mph, while the BR 420 provides a slightly higher velocity, enhancing its capacity for more challenging tasks.

Both blowers incorporate a multi-function control handle, allowing operators to easily manage the throttle and other functions with one hand. This design reduces user fatigue and increases operational efficiency. The ergonomic harness system ensures comfort during prolonged use, featuring adjustable straps and a padded back panel to evenly distribute weight and minimize strain.

Fuel capacity for both models is approximately 1.56 liters, providing extended operation between refueling. The blowers are constructed with durable materials, ensuring longevity and reliable performance in various weather conditions. Noise reduction features are also integrated, although users should still adhere to safety guidelines regarding hearing protection.

The Stihl BR 340 and BR 420 are suitable for professionals and homeowners requiring a powerful and dependable solution for outdoor cleaning tasks. Their combination of power, ergonomic design, and durability makes them an ideal choice for maintaining large properties or commercial spaces.

Stihl BR 340 BR 420 F.A.Q.

How do I start the Stihl BR 340 or BR 420 blower?

To start the Stihl BR 340 or BR 420 blower, ensure the stop switch is in the "I" position, set the choke lever to the closed position, pull the starter rope until you hear the engine fire, then move the choke to the open position and pull the starter rope again until the engine starts.

What is the proper fuel mixture for the Stihl BR 340 and BR 420?

The Stihl BR 340 and BR 420 require a 50:1 fuel mixture ratio, which means 50 parts gasoline to 1 part 2-stroke engine oil. Always use high-quality oil and gasoline.

How often should I clean the air filter on my Stihl BR 340 or BR 420?

It is recommended to check and clean the air filter after every 10 hours of operation. More frequent cleaning may be necessary in dusty conditions. Replace the filter if it shows signs of damage or excessive dirt that cannot be cleaned.

What should I do if my Stihl BR 340 or BR 420 won't start?

First, check the fuel level and ensure the fuel mixture is correct. Verify that the spark plug is clean and properly gapped. Inspect the air filter for clogs and clean or replace it if necessary. Finally, check the ignition system for any faults.

How can I adjust the carburetor on my Stihl BR 340 or BR 420?

Adjusting the carburetor should be done by a professional as incorrect settings can damage the engine. However, if necessary, refer to the user manual for the specific procedures and settings. Ensure the air filter is clean before making any adjustments.

What maintenance should be performed regularly on the Stihl BR 340 and BR 420?

Regular maintenance includes checking and cleaning the air filter, inspecting and replacing the spark plug as needed, checking the fuel filter, and ensuring all nuts and bolts are tight. Also, inspect the blower tube and fan for debris buildup.

How do I store my Stihl BR 340 or BR 420 when not in use?

Before storing, clean the blower thoroughly, empty the fuel tank, and run the engine until it stops to clear the carburetor of fuel. Store in a dry, dust-free environment. Disconnect the spark plug to prevent accidental starting.

Why is my Stihl BR 340 or BR 420 losing power during operation?

Loss of power can be caused by a dirty air filter, a clogged fuel filter, or a fouled spark plug. Check each of these components and clean or replace them as necessary. Also, ensure the carburetor is properly adjusted.

How can I reduce vibration when using my Stihl BR 340 or BR 420?

Ensure that all parts are properly assembled and that the anti-vibration mounts are intact and in good condition. Regularly inspect the blower for any loose components and tighten them as needed.

What should I do if the blower tube on my Stihl BR 340 or BR 420 becomes clogged?

Turn off the engine and disconnect the spark plug for safety. Remove the blower tube and clear any debris manually. Check and clean the fan housing if necessary before reassembling the unit.