Stihl BR 550 Technical Guide - Page 12

Page 12 5.1.3 Basic setting without limiter cap Technical Information 08.2005 5.1.4 Securing the limiter caps H L 249TI007 KN . Starting from the tight position of the adjusting screws: Open H = 2 turns Open L = 3 1/2 turns Set the specified speeds within the tolerance range of +/- 200 rpm. 1. Set speed to 3,300 rpm with idle speed adjusting screw (LA). 2. Turn the low-speed adjusting screw (L) clockwise or anticlockwise to set the highest speed. If this speed is greater than 3,700 rpm, stop and start again with step 1. 3. Set the speed to 3,300 rpm again with idle speed adjusting screw (LA). 4. Set the speed to 2,500 rpm with low-speed adjusting screw (L). 5. Set the maximum speed with the high-speed adjusting screw (H): BR 500: 5,500 rpm BR 550: 6,100 rpm BR 600: 7,200 rpm If you make the setting too lean it will increase the risk of engine damage through lack of lubrication and overheating. 6. Continue with "securing the limiter caps". Used caps may not be reused, as they are damaged when pulled off. . Align the new limiter caps for the adjusting screws on the stop knob (arrow) and press on to the 2nd clearly locked position. Do not press on the limiter caps until they contact the carburetor housing since they would become damaged: Minimum distance a = 1 mm TI_08_2005_11_01_02.fm