Contents: Adjusting idle speed and CO 🠛 Idle speed adjustment 🠛 Installing the float 🠛 Opening the throttle valve 🠛
Adjusting idle speed and CO
1. Refer to the specifications for the idle speed of the various models. Of particular note is the difference in idle speed when the 28x36 carburetor is installed on the engine. Before making any adjustments, measure the idle speed using the tachometer and CO meter.
2. The air damper must be fully open.
3. Set the correct ignition timing.
4. Determine the valve clearances.
5. Connect the tachometer and CO meter according to the manufacturer's instructions.
6. Install the air filter on the carburetor.
7. Warm up the engine until the thermostat opens. You can also drive a short distance for this purpose.
8. Determine the engine idle speed using a tachometer and compare it with the specified value.
9. Determine the CO content. The value should be 1.5±0.5%, regardless of the type of carburetor. The idle mixture adjustment screw is closed with a plastic plug. This screw is used to set the CO content and the plug should always be changed if the screw was opened for adjustment. Under normal conditions, it is sufficient to adjust the idle speed with a special screw.
Idle speed adjustment
10. Turn the throttle adjustment screw until the specified idle speed is established. Increase the speed several times and let the engine idle.
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11. Turn the screw until maximum idle speed is reached.
12. Repeat both adjustments until the adjusted idle speed is held by the screw.
13. To make the working mixture leaner, screw in the adjusting screw until the engine shaft speed reaches 20-25 rpm. The final adjustment is always made by tightening or loosening the other screw.
14. Set the CO meter according to the manufacturer's instructions. If the value is not 1.5±0.5%, turn the screw accordingly.
15. Once again determine the engine speed at idle using a tachometer and measure the CO content. If the adjustment is performed in accordance with the standards, install a new seal on the screw.
Installing the float
16. Place the carburetor cover so that the weight of the float is sufficient to close the needle valve without pressing on the sphere in the seat.
17. Measure the float travel between the seal and the float and, if necessary, change the travel by 7 mm by bending the float lever so that it does not interfere with the tongue.
18. Carefully move the float outward to check its additional travel. It should be 8 mm, i.e. the sum should be 15 mm in total. Once the adjustment is complete, bend the tab.
Opening the throttle valve
19. Close the air flaps completely and make sure that the screw is against the upper projection of the starting valve cover. To check the throttle valve clearance, insert a flexible rod with a diameter of 0.8 mm between the throttle valve of the first chamber and the carburetor hole. The clearance can be adjusted with the screw.