How to Adjust the Carburetor for Fuel Efficiency?
2 Answers
There are several methods to adjust the carburetor for fuel efficiency: 1. Appropriately lower the fuel level in the float chamber. 2. Reduce the diameter of the main jet. 3. Lower the carburetor's main needle. 4. Actively reduce the fuel supply. Here is more information about the carburetor: 1. The main jet comes in two types: fixed and adjustable with a screw needle. 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 all the way in, then turn it counterclockwise about one and a half turns. 2. Reasonably lowering the mixture concentration should prioritize engine stability. The car should not experience hesitation during acceleration or carburetor backfire. Multiple adjustments may be needed to reach the optimal level. 3. The throttle opening within two-thirds is the leanest and most fuel-efficient state for the mixture. 4. Generally, avoid pressing the accelerator all the way down to achieve fuel efficiency.
I've been repairing cars for many years, and the key to carburetor fuel efficiency lies in precise mixture adjustment. After starting the engine and warming it up, first adjust the idle screw to stabilize the RPM at around 800. Too high wastes fuel, too low causes stalling. Then loosen the mixture screw until the idle becomes unstable and tighten it half a turn to find that sweet spot. Remember to clean the carburetor passages to prevent deposits from blocking air intake. For tools, using feel is sufficient, or borrow a vacuum gauge for more accuracy. Don't overlook driving habits: gentle throttle, maintaining steady speed, and avoiding sudden braking can save even more fuel. Regular checks of spark plugs and filters are also essential, with maintenance about every six months.
