How to repair a carburetor: comprehensive analysis and practical guide
As the core component of a traditional fuel engine, the carburetor's maintenance directly affects vehicle performance. This article will combine the hot topics on the Internet in the past 10 days (data are shown in the table below) to systematically explain common carburetor faults and repair methods to help car owners quickly solve the problem.
| hot topics | Discussion popularity | Correlation failure |
|---|---|---|
| Carburetor Oil Leak Emergency Treatment | 82,000 times | Float chamber seal failure |
| Cold start difficulty solution | 65,000 times | Choke failure |
| Reasons for sudden increase in fuel consumption | 58,000 times | Main measuring hole blocked |
| Repair tips for unstable idle speed | 43,000 times | Idle oil passage blocked |
1. Working principle of carburetor
The carburetor atomizes the fuel through the Venturi effect, mixes it with air, and sends it into the cylinder. The main structure includes: float chamber, main measuring hole, idle oil passage, choke valve, accelerator pump and other components.
| Part name | Function description | Failure performance |
|---|---|---|
| float room | Maintain constant oil level | Oil spill/insufficient oil supply |
| Main measuring hole | Control main oil flow | Power loss/black smoke |
| Idle oil passage | Maintain low speed operation | stall/speed fluctuation |
2. Common fault repair methods
1. Oil leakage troubleshooting
Steps: ① Check the float needle valve sealing ② Test the float height (see the table below for standard values) ③ Replace the aging gasket. NOTE: Wear protective gloves when using carburetor cleaner.
| car model | Float height (mm) | Adjustment method |
|---|---|---|
| 125cc motorcycle | 18.5±0.5 | Bent float arm |
| 1.6L car | 15.0±0.3 | Replace adjustment shim |
2. Difficult to repair during cold start
Key inspections: ① Choke linkage mechanism ② Fuel injection amount of accelerator pump ③ Low temperature starting oil circuit. Practical data: When the choke is fully closed, the air intake cross-section should be reduced by 60%-70%.
3. Troubleshooting abnormal fuel consumption
Use compressed air to clean the main measuring hole (recommended pressure is 0.3-0.5MPa). Please refer to the following table for inspection contents:
| Check items | Standard value | Tools |
|---|---|---|
| Main measuring hole diameter | φ1.2-1.5mm | Needle gauge set |
| Oil needle wear | <0.1mm | Micrometer |
3. Maintenance suggestions
① Clean the carburetor every 5000km ② Use unleaded gasoline ③ Drain the fuel when parked for a long time. Note: Carburetor cleaner cannot be used in the electronic injection system.
4. Maintenance precautions
1. Mark the position of each oil pipe before disassembly
2. It is prohibited to use wire flux holes
3. The idle speed needs to be adjusted after assembly (see the table below for standard speed)
| Engine type | Idle speed (rpm) |
|---|---|
| single cylinder motorcycle | 1400±50 |
| four cylinder car | 750±25 |
Through systematic maintenance, 90% of carburetor failures can be solved on site. If you encounter complex problems, it is recommended to use a professional vacuum detector to measure the mixing ratio parameters under various working conditions.
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