GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
No liability for printing errors. We reserve the right to introduce modifications.
04/2011
6
Running the engine for the first time
Before attempting to start the engine for the first time you should check that all external components are
firmly seated, including the carburettor, exhaust manifold and silencer. The engine is set up at the factory,
and should run without further adjustment.
Fuel
The fuel mixture should consist of a 1 : 25 blend of oil and petrol (i.e. petrol with 4% oil content). Fuel should
be Super or Super-Plus grade petrol. We recommend our Comp 2 Plus Silkoil, Order No. 6702.1L, as
lubricant.
Starting the engine from cold
Close the carburettor throttle flap and move it to the Idle position. Close the choke flap on the carburettor,
then press the priming pump on the carburettor until fuel is visible in the transparent bowl. Grasp the pull-
cord starter toggle and pull it repeatedly until you feel the first detectable resistance. Now pull the cord
strongly and vigorously until you hear the engine fire. The engine will generally stop again at this first
attempt. Open the choke flap and pull the starter again until the engine fires and continues to run.
NOTE:
never run the engine at full-throttle or high speed when it is cold; allow it to warm up for three or four minutes
before opening the throttle. The engine can be stopped at any time using the safety switch (shorting switch)
mounted on the outside of the hull
.
Starting a warm engine
Leave the choke flap open, press the priming pump, and pull the cord to start the engine. The engine is
stopped using the safety switch (shorting switch) on the outside of the hull.
Adjusting the carburettor
As supplied, the carburettor is set up correctly to suit
the local conditions at the time of adjustment, but
further minor alterations may be necessary according
to the silencer you are using and / or the ambient
conditions. The first step in setting up the engine is to
allow it to warm up to operating temperature. If there is
a delay in the engine’s response when you open the
throttle, then the mixture is too lean. In this case open
up the idle mixture screw L slightly by rotating it anti-
clockwise. If the engine stutters and emits clouds of
smoke as it picks up speed, then the mixture is
probably set too rich. In this case close the idle mixture
screw L by turning it clockwise by a small amount. To
adjust the high-speed setting you must first place the
boat on the stand (
IMPORTANT:
make certain that
nothing can obstruct or contact the propeller - extreme
injury hazard!), then start the engine and apply full-
throttle briefly. If the mixture is too lean, turn the full-
throttle mixture screw H slightly to the left; if too rich,
turn the screw a little to the right. The idle stop screw is
used to set the idle speed, which should be no lower
than 2500 rpm.
IMPORTANT:
don’t allow the engine to
run at maximum speed for more than a brief period in
its unloaded state (i.e. out of the water).
NOTE:
if you
make an adjustment to a carburettor setting, i.e. the
idle mixture screw L and / or the full-throttle mixture
screw H, you will generally need to adjust the idle stop
screw afterwards.
Basic carburettor settings
The following values represent a starting point for the basic carburettor settings. In most cases only fine-
tuning is required, but if you make major changes to the idle mixture screw L and / or the full-throttle mixture
screw H, you will need to start again from the beginning using the following procedure: carefully turn the two
screws L and H clockwise as far as they will go, then unscrew the idle mixture screw by 1.5 full turns, and the
