Repair manual

10 Maintenance
97 Carburetor setting
Due to the exhaust emission standards currently in effect, the L and H adjusting screws of the
unit are not accessible from the outside. After they were set at the factory, these holes were
sealed off with plugs. This prevents end customers from making any unauthorized changes to
the setting. To set the carburetor, you must first disassemble it. The end customer can still set
the S stop screw in accordance with the operator's manual.
If the cutting disc always rotates, check the clutch drum, clutch segments, and clutch springs.
Note: It is not possible to set the H adjusting screw by checking the maximum
engine speed, since the unit has a maximum rpm limitation built in the
ignition module. The setting of the H adjusting screw must not fall be-
low the minimum setting to prevent damage to the piston and cylinder
caused by a too lean fuel mixture in the engine.
If the cutting disc always rotates, check the clutch drum, clutch seg-
ments, and clutch springs.
Setting
BTS 930 L3
BTS 935 L3
BTS 1030 L3
BTS 1035 L3
H adjusting screw 1 1/4th of a revolu-
tion outward
1 1/4th of a revolu-
tion outward
L adjusting screw 1 1/4th of a revolu-
tion outward
1 1/4th of a revolu-
tion outward
S adjusting screw Cutting disc must
not rotate
Cutting disc must
not rotate