Stihl BR 800 - Operating Instructions; During Operation; Replacing the Air Filter

BR 80024
If it drops, the reason may be:
– The inlet needle (15) is not sealing (foreign matter in
valve seat, sealing cone of inlet needle (15) is
damaged or inlet control lever (14) is sticking).
– The pump diaphragm (6) or the gasket (5) is
damaged.
– The metering diaphragm (17) or the gasket (16) is
damaged.
9.3 Disassembling the Carburetor
N Remove the carburetor, @ 8.2.
9.3.1 Removing the Pump Diaphragm and Strainer
N Take out the screws (1).
N Remove the end cover (2).
N Remove the spring (3).
N Remove the washer (4).
N Remove the gasket (5) together with the pump
diaphragm (6).
N Separate the pump diaphragm (6) and gasket (5).
If the pump diaphragm (6) is deformed / warped:
N Fit new pump diaphragm (6).
N Use a needle to remove the strainer (7) from the
carburetor (9).
9.3.2 Removing the Metering Diaphragm
N Take out the screws (19).
N Remove the end cover (18).
N Remove the gasket (16) together with the metering
diaphragm (17).
N Separate the metering diaphragm (17) and
gasket (16).
If the metering diaphragm (17) is deformed or hard:
N Fit new metering diaphragm (17).
9.3.3 Removing the Inlet Needle
N Remove the metering diaphragm, @ 9.3.2.
N Take out the screw (11).
The spring (12) may pop out.
N Pull the inlet control lever (14) with spindle (15) out of
the annular groove in the inlet needle (13).
N Remove the spring (12).
N Remove the inlet needle (13).
If there is an annular indentation (arrow) on the sealing
cone of the inlet needle (13):
N Fit a new inlet needle (13).
9.3.4 Removing the Adjusting Screws
N Unscrew the idle speed screw (36).
N Use screwdriver 5910 890 2307 to remove the low
speed screw (33).
N Use screwdriver 5910 890 2307 to remove the high
speed screw (32).
9.3.5 Removing the Throttle Lever
N Unscrew the idle speed screw (36), @ 9.3.4.
N Take out the screw (26).
N Pull off the throttle lever (27).
N Remove the spacer sleeve (29).
N Remove the ring (30) together with the sealing
ring (31).
N Pry the sealing ring (31) out of the ring (30).
N Remove the E-clip (28).
N Remove the pin (24).
N Remove the washer (25).
9.3.6 Removing the Throttle Shaft
N Remove the throttle lever (27), @ 9.3.5.
N Take out the screw (8).
N Remove the throttle shutter (9).
N Pull out the throttle shaft (38).
N Remove the ring (41) together with the sealing
ring (42).
N Pry the sealing ring (42) out of the ring (41).
N Pull off the bushing (40).
N Remove the spring (39).
9.3.7 Removing the Accelerator Pump
N Remove the throttle shaft (38), @ 9.3.6.
N Use scriber to pry out the end cover (43).
N Pull out the pump piston (44).
N Remove the sealing ring (45) from the pump
piston (44).
N Pull out the spring (39).
9.3.8 Removing the Choke Shaft
N Take out the screw (21).
N Remove the choke shutter (20).
N Pull off the choke knob (37).
N Take out the screw (35).
N Pull out the clip (34).
11
13
13
15 14
12
0000-GXX-6664-A1