Repair Engine and Upper Machine Components
wc_tx001546gb.fm 49
4.11 Tillotson Carburetor (BS 500/600/700/650 only)
See Graphic: wc_gr001308rm
Recommended Tools
Ratchet Wrench
Torque Wrench
Hex Key or Hex Socket: 4 mm, 6 mm
Screwdriver
Loctite 243 (blue)
The Tillotson carburetor uses a fixed low and high speed fuel jet. The
only adjustment is to set the engine idle speed.
Refer to section Technical Data for the correct idle and operating rpm.
For best accuracy, use a tachometer when making carburetor
adjustments.
NOTICE: The engine is lubricated by the fuel mixture; running the
engine too lean could cause it to overheat.
High Altitude Operation
The WM 80 engine used in the rammers is designed to operate most
efficiently at normal altitudes (1524 meters) (up to 5000 ft.). At high
altitudes (1524 meters) (above 5000 ft.) minor modifications to the
carburetor can be made to improve its performance. All modifications
must be performed by an authorized WACKER dealer. Contact
WACKER Corporation for more information.
High altitude operations involve modifications to the engine air/fuel
mixture. At normal altitudes, these modifications can be damaging to
the engine components. When returning the rammer to normal altitude
operation, remember to reset the carburetor to its standard
specifications.
Setting Idle Speed Adjustment
4.11.1 Start the engine and allow it to warm up to operating temperature.
4.11.2 Set the engine idle speed with the engine running at idle and the choke
(a) fully open. Adjust the idle speed screw (b) in or out to obtain the
correct idle speed.
NOTICE: DO NOT turn the adjusting screw in too tightly or you may
damage the carburetor.
Removing the Carburetor
4.11.3 Remove the three socket head cap screws holding the carburetor
guard to the engine. When reinstalling the carburetor guard, apply
Loctite 243 and torque the screws to 23 Nm (17 ft. lbs.).
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