Radne Raket 120, Руководство пользователя

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User Manual
as the choke. The purpose of the choke is to enrich the fuel during start by
restricting the air flow and increasing the vacuum in the venturi. When you
intend to start your Raket engine, you normally close the choke and pull the
starter rope. After one or two pulls the engine will start. As the fuel-mixture
with closed choke is very rich, the engine will normally stop soon. Then you
open the choke, open the throttle a little and pull the starter again. Now the
engine shall normally start on the first pull and run smoothly.
Installation
Apart from connecting the carburettor to the fuel tank, you also connect
the lever of the throttle shaft to your accelerator pedal or other device that
controls the speed of the engine. Note that on the carburettor there is an
idle speed adjustment screw that allows you to set the rpm when the engine
idles. The correct setting is found in combination with the setting of the
low speed needle valve. When idling you shall be able to open the throttle
without any tendencies for the engine to stop or stall. When you make this
adjustment you normally let the engine run at a speed a little over the nor-
mal idle speed by turning the inlet speed adjustment screw a little clockwi-
se. Adjust the low speed needle valve so that the engine responds directly
when the throttle is opened, both slowly and quickly. When you have found
the best setting, turn the low speed adjustment screw counter clockwise
until the correct idle speed is found.
Service
Actually, there isn’t much that can go wrong. If your fuel mixture is clean so
no deposits clog up the interior of the carburettor you will have a problem
free operation. We recommend you to change the two diaphragms and the
gaskets once every year. If you haven’t used your engine for some time, the
diaphragms may have hardened and you may change them if you notice
the engine is more difficult to start or it doesn’t run smoothly at low rpms.
If you are troubled with unstable operation, i.e. sometimes the engine stops
at idle speed, sometimes it revs up and you have to adjust the setting of
the low speed needle valve. Then, it may be the inlet needle valve that is
causing you problems, and we recommend you to change the inlet needle
valve (part No 32025).
NOTE. If you find that you have problems with deposits in the interior of
your carburettor due to contaminated fuel, we recommend you to install a
small fuel filter in the hose between the tank and the carburettor.
If none of the hints above solve your problems, and you still have problems
with low power or unstable idle speed, check the condition of all gaskets in
the carburettor and between the carburettor, heat shield (part No 32065)
and the cylinder. If this doesn’t solve your problems, we recommend you to
disassemble the carburettor from the engine and have it cleaned by Radne
Motor or one of our service agents. You may also find professional help at a
service station for power chain saws, snowmobiles or garden tools.