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Traxxas replacement carburetor is constructed of aluminum. Comes assembled. Rotary style throttle control. Twin-Needle with high and low speed adjustment. Barrel adjustable screw.
Pro .15 Engine
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needle valve settings
HIGH-SPEED MIXTURE SETTING
The high-speed mixture screw controls how much fuel enters the engine during mid and high-speed operation. Turn the high-speed mixture screw clockwise, by hand, until it stops (Do not tighten or the needle may be damaged). Now, turn the mixture screw counter-clockwise 2 1/2 complete turns.
SETTING THE IDLE SPEED
The idle screw regulates the throttle opening to control the idle speed. The throttle opening at idle should be set as shown in the drawing. The opening should be 1 to 1 1/2 millimeters at the widest point in the opening. Make sure that the throttle trim on the transmitter is adjusted correctly so that the throttle arm actually rests against the idle stop screw. Do not attempt to control your idle speed with the throttle trim control on the transmitter. The idle speed may need to be readjusted after the engine is warm.
LOW SPEED MIXTURE SETTING
This screw meters the fuel at low speeds. The low-speed mixture screw is located in the end of the carburetor, inside the throttle arm. This screw controls how much fuel enters the engine at idle and low throttle. This adjustment will smooth the idle and improve acceleration to mid-speed. Make this adjustment with the throttle closed, after setting the idle. To get the low speed mixture into the correct range of adjustment, turn it in or out until the head of the screw is flush (even) with the end of the throttle arm assembly. This will be the starting point for break in.