Stihl BR 550 Technical Guide - Page 8

Page 8 Technical Information 08.2005 2. Specifications 2.1 Engine Displacement Cylinder bore Piston stroke Idle speed Operating speed with nozzle Maximum air flow Air flow with nozzle Air velocity Sound pressure level Lpeq according to EN ISO 11201 1) Sound power level Lweq according to ISO 37441) Vibration acceleration to ISO 86621) aeq Idle speed at max. RPM Weight BR 500 5,500 rpm 1,380 m³/h 810 m³/h 81m/s 86 dB(A) 95 dB(A) BR 550 64.8 cm3 50 mm 33 mm 2,500 rpm 6,100 rpm 1,490 m³/h 900 m³/h 89 m/s 92 dB(A) 103 dB(A) BR 600 7,200 rpm 1,720 m³/h 1,210 m³/h 90 m/s 96 dB(A) 105 dB(A) 1.7 m/s2 1.4 m/s2 9.9 kg 1.5 m/s2 1.6 m/s2 9.7 kg 1.7 m/s2 1.8 m/s2 9.5 kg 1) Weighted equivalent level includes idling, full load and racing with the same duration of exposure 2.2 Fuel system Carburetor All-position diaphragm carburetor with limiter caps on the high-speed adjusting screw (H) and the lowspeed adjusting screw (L) and integrated fuel pump. Standard setting with limiter caps Low-speed adjusting screw L: 3/4 turn open (max. to stop) High-speed adjusting screw H: 3/4 turn open (max. to stop) Basic setting without limiter caps Low-speed adjusting screw L: 2 turn open High-speed adjusting screw H: 3 1/2 turn open Fuel tank capacity 1.4 l (1400 cm³) 2.3 Ignition system Ignition module: Microprocessor- controlled with adjustment of the ignition timing Spark plug (suppressed): NGK CMR 6 H Electrode gap: 0.7 mm TI_08_2005_11_01_02.fm