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Base Carburetor Start-Up Settings from the Factory
If you find that your engine will not run properly it is advised that you return the carburetor settings to their
factory settings. This is done by slowly screwing the needles in clockwise until you feel resistance. You will know
that the needle is bottomed out. Then follow the specs below for both the High- and Low-Speed Needle. This will
get you to a point that you can start over again.
High-Speed Needle—2
1
/
2
turns out from the bottom
Low-Speed Needle— 2
1
/
2
turns out from the bottom
About Glow Plugs
The glow plug is like the ignition system in your automobile. The coiled element in the center of the plug glows
red hot when connected to a 1.5-volt battery (located in the igniter). This is what ignites the fuel/air mixture when
compressed in the cylinder. After the engine fires, the heat generated by the burning fuel
keeps the element hot. Common reasons for the engine not starting are the 1.5-volt battery
being weak, the glow plug being wet with fuel, or the element burned out. Use a spare glow
plug to check the igniter. If the igniter makes the element glow, remove the plug from the
engine to check it in the same manner. A wet glow plug means there is excess fuel in the
engine. To eliminate this, with the glow plug removed and the model on the starter box put a
rag over the head and turn the engine over a few seconds. This will remove the excess fuel in
the engine. Reinstall the glow plug, making sure you have the brass gasket on it. The engine
should start now. We recommend the Dynamite
®
DYN2495 Glow Plug as this is the best glow plug for this engine.
The DYN2495 Glow Plug has been designed to deliver an ideal balance of performance and longevity.
Testing the Temperature
Although the DX3S radio offers temperature readout, the following is a handy backup method. The ideal operating
temperature for the engine will vary with the air temperature but in general it should be in the 190 to 230° F
(88 to 110° C) range. A simple way to check the engine temperature is to put a few drops of water on the top of
the head/heat sink. It should take 3−5 seconds for the water to evaporate. If it boils away quickly the engine is
overheating and the high-speed needle needs to be richened (turned counterclockwise) at least “two hours.” With
the DX3S radio you will notice the engine runs cooler when the vehicle is being driven. This is obviously true as
air is passing through the fins on the head cooling the engine. In order to obtain an accurate temperature reading
from the engine, stop the car in a safe area, and let the engine idle for 10 seconds. You will notice that your engine
temperature on the radio will increase and then stabilize. Once the temperature stabilizes, this is your true engine
temperature.
DYN2495 Shown
