Technical Information 08.2005 Page 13
TI_08_2005_11_01_02.fm
5.2 Standard setting with limiter caps
The limiter caps must not be removed when making
the standard setting.
. Turn the high-speed adjusting screw (H) and
low-speed adjusting screw (L) anticlockwise as
far as possible (max. 3/4 turn).
See instructions for use, "Setting the carburetor," to
set the carburetor for users.
5.3 Accelerator pump
The carburetor is equipped with an accelerator
pump.
The pump piston (1) is located in the cylinder bore
(a) behind the throttle shaft (2) and is held in the idle
position by a compression spring (3).
When opening the throttle shutter, fuel is also sent
through the main nozzle into the the air cone
(Venturi valve) providing fast and spontaneous
acceleration.
5.4 Valve clearance
The valve clearance must be checked once after
approx. 139 hours of operation and adjusted if
necessary.
The valve clearance may only be checked and
adjusted when the engine is cold. Kit 4282 007 1001
"Parts for adjusting valve clearance" must be used
for this purpose. The kit comprises a setting gauge,
O-ring and gasket.
5.4.1 Preparatory steps
. Remove the shroud with rewind starter
. Remove the lines from the ignition module
. Remove the air guide shroud.
. Unscrew spark plug
. Clean area around valve cover
. Remove screw (1)
. Remove O-ring (2), valve cover (3) and
gasket (4)
. Determine top dead centre
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