Evolution EVOE10GX Mode D'emploi page 11

Baseline Needle Valve Settings
Your engine comes from the factory with the
needles set at the first run baseline settings
(High-Speed: 2 1/4 turns out, Low-Speed: 5
3/8 turns out). No adjustment is necessary.
If you find you need to move the carbure-
tor back to the baseline settings follow the
procedure below.
Low-Speed Needle Valve Setting
The low-speed needle valve should be set
5 3/8 turns from closed when the carburetor
barrel is completely closed. The proper way to
determine this is to:
1. Disconnect your throttle arm from the
throttle pushrod. Insert the included 1.5mm
needle valve extension into the carburetor
and close the barrel until it is stopped by
the extension. The needle valve extention
establishes a 1.5mm opening as a baseline
for adjusting the low-speed needle.
2. While holding the throttle arm turn the low
speed needle clockwise until you feel it
trying to force the throttle arm to move and
open the carburetor barrel. Be careful here
and do not force it past this point.
3. Turn the low speed needle valve counter-
clockwise (open/richen) by 5 3/8 turns.
This setting will be within +/– 1/16 of a
turn from a proper low-speed needle valve
setting.
4. Reconnect your throttle pushrod to the
throttle control arm.
Starting and Operating the 10GX Engine
Now that you have the baseline needle valve
settings you are ready to start your engine for
the first time. With the 10GX it is very
important to allow the temperature to
stabilize above 170°F (75°C) before making
any adjustments; adjusting prior to the engine
warming up will lead you to inaccurate
settings. As the engine warms up you will
notice the rpms naturally rising.
If you do not have a temp gun or have sensors
installed on your engine then allow the engine
to run at half throttle for at least 45 seconds
before attempting to set the high-speed
needle. If you have accurately set the low-
speed needle as described you should not
need to adjust it.
Tip: The O-ring seal on both needle valves is
very tight and it can make the first
adjustments of your engine settings difficult.
If you find the seal too tight, the best method
to free it up is to actually open (counter-
clockwise) the needle valve a couple of turns
before trying to turn the needle in (clockwise).
High-Speed Needle Valve Setting
The baseline high-speed needle valve setting
for initial start-up is 2 1/4 full turns from
closed. The proper way to determine this is to:
1. Turn the high speed needle valve clockwise
until you reach its seat. Do not force it past
this point because you can damage the
needle and/or the needle seat.
2. Turn the high speed needle valve counter-
clockwise 2 full turns. This setting will be
rich by 1/4 to 1/2 turn but it will insure an
easy first start.
3. Our experience has been that the engine
likes to run between 1 1/2 and 1 3/4 turns
open once fully broken-in.
Priming
1. Make sure your ignition is off.
2. Open the throttle fully and either by hold-
ing a finger over the carburetor intake or
the muffler exhaust flip the propeller 4
times.
3. Remove your finger from either the carbure-
tor or muffler exhaust and flip the engine
another 6 times.
4. Close the carburetor completely with your
throttle stick and then open it two detents
from closed. This will allow the engine to
start at a high throttle setting.
Because each fuel system and installation
is slightly different you may find the need
to modify the above procedure for your
individual setup. The above procedure should
work for most installations.
EN
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