How to Adjust the Carburetor Needle for Fuel Economy?
1 Answers
Carburetor needle adjustment methods are as follows: 1. Float chamber: The fuel level in the float chamber should be adjusted slightly lower. Fuel in the float chamber enters the carburetor throat through the main jet and mixes with air to form a combustible mixture. Appropriately lowering the liquid level reduces pressure difference. 2. Main jet: For fixed main jets, you can wrap one or two thin copper wires inside the jet to reduce fuel flow. For adjustable types, first screw the needle valve all the way in, then rotate it counterclockwise about one and a half turns. The key to properly reducing mixture concentration is maintaining stable engine operation - the vehicle should not experience hesitation during acceleration or carburetor backfire. Multiple adjustments may be needed to reach optimal levels.