O.S. Engines GT55 - Manual (Page 11)

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Second and later starting of the day
Set the throttle stick on the transmitter at bottom or 1/8
(2~3 clicks) advanced from the bottom.
Make sure the choke valve is fully opened.
Turn on the ignition switch.
Tell the helper and onlookers that you will start the engine
now and have the helper hold the model securely.
Apply the electric starter.
Starting with a Chicken stick or gloved hand No.1
(Two different procedures are explained.)
(It is suggested to use an electric starter.)
First starting of the day
Flip the propeller until the fuel runs out of the carburetor,
then flip 3~4 times more (6~7 times in winter).
(In case of upright and side installation, flip 7~8 more time
after the fuel reaches the carburetor.)
Open the choke valve fully. With the throttle stick fully
open, flip 6~7 times to draw the fuel mixture into the
cylinder.
Set the throttle stick on the transmitter at bottom or 1/8
(2~3 clicks) advanced from the bottom.
Turn on the ignition switch.
Tell the helper and onlookers that you will start the engine
now and have the helper hold the model securely.
Usually the engine starts with 1~3 flips. If you have only
short runs or the engine does not start with more than 10
flips, most probably priming is not sufficient.
Repeat the procedure from the beginning.
Make sure the ignition switch is off.
Close the choke valve fully.
Fully advance the throttle stick on the transmitter.
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2.
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Make sure the ignition switch is off.
Close the choke valve fully.
Fully advance the throttle stick on the transmitter.
Flip a propeller 2~3 times (3~4 times in winter).
(In case of upright and side installation, flip 3~4 times.)
Open the choke valve fully. Flip the propeller 6~7 times to
draw the mixture into the cylinder with the throttle stick fully
advanced.
Set the throttle stick at bottom or 1/8 (2~3 clicks) advanced
from the bottom.
Turn on the ignition switch.
Tell the helper and onlookers that you will start the engine
now and have the helper to hold the model securely.
Flip the propeller with a Chicken stick or gloved hand to
start the engine.
Set the throttle stick on the transmitter at bottom or 1/8
(2~3 clicks) advanced from the bottom.
Make sure the choke valve is fully open.
Turn on the ignition switch.
Tell the helper and onlookers that you will start the engine
now and have the helper to hold the model securely.
Flip the propeller with a Chicken stick or gloved hand to
start the engine.
Note
If the engine does not start after more than 5 times repeat
the procedure, over-priming is suspected. Check whether
the plug is wet or not. If the plug is wet, replace it or wait
until it is dried. Then, flip the propeller swiftly (15~20
times) with the plug removed to eject the fuel in the
cylinder. Then, install the plug and repeat the starting
procedure.
Second and later starting of the day
Starting with a Chicken stick or gloved hand while the
engine is warm
Starting with a Chicken stick or gloved hand when the
engine is cold