STIHL BR 340 Parts Manual

The STIHL BR 340 is a professional-grade backpack blower designed for demanding commercial and residential use. This parts manual provides detailed diagrams, part numbers, and ordering information for all components of the BR 340, including the engine, carburetor, fuel system, ignition, cooling system, blower tube, harness, and controls. Below are key sections for identification, engine parts, blower assembly, controls, maintenance parts, and ordering.

1. Product Identification & Serial Number 2. Engine Assembly Parts 3. Carburetor & Fuel System Parts 4. Ignition & Electrical System Parts 5. Cooling System & Fan Housing Parts 6. Blower Tube & Nozzle Assembly 7. Harness & Control Parts 8. Maintenance Parts & Kits 9. Exploded Views & Diagrams 10. Parts Ordering Information 11. Torque Specifications

Product Identification & Serial Number

Locate the serial number plate on the blower housing. Record this number for all parts inquiries and warranty service.

Component	Location / Description
Model Number	BR 340 (stamped on housing)
Serial Number Plate	Affixed to main blower housing near throttle trigger
Engine Type	STIHL 2-Mix engine, single cylinder
Displacement	35.2 cc
Power Output	1.4 kW / 1.9 hp
Fuel/Oil Mix	50:1 (STIHL HP Ultra oil recommended)

Engine Assembly Parts

Cylinder, piston, crankshaft, connecting rod, bearings, and seals.

Cylinder: Part # 1128 020 2001 - Includes cylinder and decompression valve port.
Piston: Part # 1128 030 2001 - 35.2cc, with piston rings and wrist pin.
Crankshaft: Part # 1128 040 2001 - Complete crankshaft assembly.
Crankcase: Part # 1128 050 2001 - Upper and lower halves.
Bearings & Seals: Main bearings (Part # 9503 003 1340) and crankshaft seals (Part # 1128 084 1400).

WARNING! Engine disassembly requires specialized tools and training. Refer to service manual for procedures.

Carburetor & Fuel System Parts

STIHL Zama C1Q-S carburetor, fuel lines, filter, tank, and cap.

Carburetor Assembly: Part # 1128 120 0601 - Complete C1Q-S carburetor.
Carburetor Repair Kit: Part # 1128 007 1003 - Includes diaphragms, gaskets, needle valve.
Fuel Filter: Part # 0000 350 3501 - In-tank filter.
Fuel Line: Part # 1128 358 0500 - 3.5mm ID fuel hose.
Fuel Tank: Part # 1128 350 0501 - 1.3 liter capacity.
Fuel Cap: Part # 0000 350 0502 - Venting fuel cap.

CAUTION! Use only STIHL-approved fuel system parts to prevent leaks and engine damage.

Ignition & Electrical System Parts

Ignition Module: Part # 1128 400 1301 - Electronic ignition coil.
Spark Plug: BOSCH WSR6F or equivalent (Part # 0000 400 1305).
Stop Switch: Part # 1128 419 0500 - Engine kill switch.
Wiring Harness: Part # 1128 497 0500 - Main wiring assembly.
Throttle Trigger Switch: Part # 1128 419 0600 - Interlock safety switch.

Cooling System & Fan Housing Parts

Fan, housing, shrouds, and heat shields.

Fan: Part # 1128 141 0500 - 6-blade plastic fan. Fan Housing: Part # 1128 145 0501 - Main blower housing. Muffler: Part # 1128 145 0800 - With spark arrestor screen. Heat Shields: Part # 1128 145 0900 - Cylinder heat shield. Air Filter: Part # 1128 140 0500 - Pre-cleaner and foam filter element.

Blower Tube & Nozzle Assembly

Tube sections, couplings, nozzle, and locking mechanisms.

Turn off engine and allow to cool before disassembly.
Release locking levers on tube couplings.
Twist and pull sections apart.

Parts: Main tube (Part # 1128 790 0500), curved tube (Part # 1128 791 0500), nozzle (Part # 1128 792 0500), locking levers (Part # 1128 793 0500), rubber couplings (Part # 1128 794 0500).

Harness & Control Parts

Backpack harness, straps, buckles, throttle cable, and control handle.

Harness Assembly: Part # 1128 850 0500 - Complete backpack harness with padding.
Shoulder Straps: Part # 1128 851 0500 - Padded straps with quick-adjust buckles.
Waist Belt: Part # 1128 852 0500 - Padded waist belt with buckle.
Throttle Cable: Part # 1128 853 0500 - Control cable from handle to carburetor.
Control Handle: Part # 1128 854 0500 - Handle with trigger and safety lockout.
Vibration Dampeners: Part # 1128 855 0500 - Rubber isolators between engine and harness.

WARNING! Inspect harness and controls regularly for wear. Replace damaged parts immediately.

Maintenance Parts & Kits

Air filter service kit, spark arrestor screen, fuel filter kit, diaphragm kit.

Exploded Views & Diagrams

Reference diagrams show part relationships and assembly order.

CAUTION! Use diagrams during disassembly to note part locations and orientations.

Parts Ordering Information

Order parts through authorized STIHL dealers using part numbers listed. Provide model and serial number. Warranty may apply to certain components.

Torque Specifications

Component	Torque (Nm)	Thread Size	Notes
Cylinder bolts	10-12 Nm	M6	Use crisscross pattern
Muffler bolts	8-10 Nm	M6	Replace gasket
Fan housing screws	4-5 Nm	M5	Plastic threads - do not overtighten
Carburetor nuts	3-4 Nm	M5	Even pressure
Spark plug	20-25 Nm	M14	Hand tight plus 1/4 turn

Service: Contact authorized STIHL servicing dealer. For dealer locator: 1-800-467-8445 or www.stihlusa.com