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Ideal for distributing liquid or solid insecticides, fertilizers or herbicides, the STIHL SR 450 easily converts from misting to dusting applications without special tools or additional equipment. A larger and more powerful engine provides a wider spray range that is 20% greater than previous models, taking 20% less time to spray the same area depending on the application.

The STIHL SR 450 Backpack Sprayer is powered by a low-emission, fuel-efficient engine and comes equipped with a large fuel tank, allowing for longer run times during use. Built for efficient operation, the SR 450’s one-hand control handle includes engine controls as well as product feed controls, allowing for superior command during use, and air speed can be easily adjusted during use for greater application and less product waste. The SR 450 can also be used as a backpack blower for debris cleanup.

Standard Features:

  • Larger and more powerful engine that provides a larger spray range as compared to previous models
  • Low-emission (meets/exceeds EPA minimum emission standards)
  • Fuel-efficient engine and large fuel tank offer long run times
  • Easily-converts from misting to dusting applications without special tools or additional equipment
  • More powerful than the STIHL SR 420
  • Anti-vibration system reduces fatigue
  • One-hand control handle includes engine controls and the product feed controls
  • Air speed can be adjusted on the fly for greater application control and reducing product waste
  • Simplified three-step starting procedure
  • View standard features common to all STIHL blowers

Optional Accessories:

  • Pressure Pump Kit (w/ULV Nozzle Set)
  • Set of ULV Nozzles

Additional Features(blower)

  • Adjustable Blower Tubes — BR 500 has 2 positions, BR 550 and BR 600 have 3 positions.
  • Heavy-Duty Pleated Air Filter
  • Superior Balance and Design help reduce fatigue and make handling easy.
  • Replaceable “In-Tank” Fuel Filters lower cost and are easy to maintain.
  • Smooth, Clean Design has no rough edges to snag on clothing or brush.
  • Long-Life Cylinders give maximum wear life, better cooling and lubrication, and more power output per cubic centimeter of engine displacement.
  • Electronic Ignition provides easier starting and smoother running.
  • Heavy-Duty Crankshaft for durability.
  • IntelliCarb™ Compensating Carburetor measures air on clean side of air filter and adjusts metering diaphragm in carburetor. Maintains RPM levels even when filter begins to clog.
  • Easy-Access Carburetor Adjustment Screws let you adjust the carburetor for local cutting conditions and altitude.
  • Anti-Vibration System helps reduce operator fatigue.
  • 2-Ring Pistons improve engine efficiency and hold compression longer than 1-ring pistons. They also transfer heat from the piston to cylinder better, helping engine stay cooler and last longer.
  • Protected Throttle Trigger helps prevent damage.
  • ElastoStart™ Handle has a built-in shock absorber for smoother starting.


  • DISPLACEMENT - 63.3cc (3.86 cu. in.)
  • POWER - 2.8 kW (3.9 bhp)
  • WEIGHT - 12.8 kg (28.2 Ibs.)
  • FUEL CAPACITY - 1700 cc (57.5 oz.)
  • CONTAINER CAPACITY - 14.0 l (3.7 gals.)
  • AIR VOLUME (with tube) - 920 m3/h (542 cfm)
  • AIR VELOCITY - 90 m/sec. (201 mph)
  • SPRAY RANGE (IDEAL CONDITIONS) - Vert.:13 m (43 ft) Horiz.: 14.5 m (48ft)

Common Features(blower)

  • Foot Pad for stability when starting.
  • Translucent Fuel Tank allows operator to easily check fuel level before starting work.
  • Protected Fuel Tank helps prevent damage.
  • Upright Fuel Tank for easy filling.
  • Easy-to-replace starter assembly.
  • Protected Choke Knob helps prevent damage.
  • Protected Spark Plug is secure yet easy to change.
  • Adjustable Straps have dual adjustments for comfort with STIHL logo on harness.
  • Lightweight Polymer Frame is padded.
  • High-Tech Polymer Housings are lightweight, withstand greater impact and are corrosion-resistant.
  • New Nozzle with increased wear area.
  • Adjustable Tube lets the operator choose the length that is right for them.
  • Joystick-style Handle has throttle control and stop/run switch.
  • Protected Control Cables shield wires.

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