Stihl MS 311 User Manual - Page 78
the carburetor
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1 2 12.6.6 Adjusting Screws 1 2 1 4903RA199 TG 4903RA196 TG : Fit the torsion spring (1) so that its leg locates against the lever (arrow). 12 : Attach the torsion spring to the lever (arrow). : Fit the lever (1) and tighten the screw (2) moderately - the lever must still turn freely. 4903RA197 TG 3 : Hold lever (1) and lever (2) together against the stop (arrow). : Tighten down the screw (3) firmly. 3 Grommet has been removed for the sake of clarity. There are three adjusting screws on the carburetor: H = high speed screw (1) L = low speed screw (2) LA = idle speed screw (3) 0001RA382 TG If the carburetor cannot be adjusted properly, the problem may be the adjusting screws. 4903RA200 TG - Check operation. - Reassemble all other parts in the reverse sequence. The high speed screw H has a limiter cap, which has to be removed before the screw is removed. - Remove the carburetor, b 12.5 - See also carburetor troubleshooting, b 3.6 2 4903RA198 TG 0001RA383 TG 1 : Hold the lever (2) steady. : Rotate the lever (1) clockwise until it butts against the stop on lever (2) and engages the end of the throttle shaft. 1 : Pull off the grommet (1). MS 311, MS 391 77