Fast idle adjustment
Checking should be carried out on the installed carburetor, adjustment - on the removed one.
1. Warm up the engine and set the fast idle lever to the second step of the stepped cam as shown in the illustration below.
Separate elements for adjusting fast idle
1 - adjusting screw; 2 - fast idle cam; 3 is an enlarged view of the fast idle cam
2. Start the engine and check the RPM with the tachometer. The value must lie within 2300±200 rpm.
3. If the value is not correct, remove the carburetor and adjust the fast idle.
4. Set the fast idle lever to the second step of the stepped cam.
5. Using a drill, measure the gap between the edge of the throttle valve of the first chamber and the carburetor hole. If the value is outside 0.63±0.07mm, adjust the screw (1) (see illustration above).
6. Install the carburetor and check the RPM as described above.
Float adjustment
1. To adjust or check the float level, the carburetor must be removed. Start the engine before adjusting the float level. Check the fuel level on the side of the carburetor through the sight glass. The fuel level should lie on the control line.
2. Otherwise, do the following:
3. Remove the carburetor.
4. Remove the carburetor cover with the float located in it.
5. Turn the carburetor cap over so that the float is positioned as shown in the illustration below.
Separate elements for adjusting the float
1 - float; 2 - float stop; 3 - needle valve float; 4 - float seat
6. Use a drill to measure the size "H". It should lie within 9.5-10.5 mm.
7. If the value does not match the required value, bend the stop tab (4).
8. Now carefully lift the float to the place indicated by the arrow in the illustration above so that it rests and measure the size "h" between the contact surface of the cover and the upper edge of the float.
9. If the size is outside 43.0-44.0 mm, carefully bend the stop of the float (2).
Throttle damper
1. To check the operation of the throttle damper, run the engine at idle. The idle speed and CO content must comply with the requirements.
2. Connect the tachometer in accordance with the instructions.
3. Move the throttle rod by hand until the tip of the damper touches the stop lever. At this point, the speed should be 2500±200 rpm.
4. If required, loosen the damper locknut and turn the adjusting screw until the number of revolutions is correct. Tighten locknut again (see illustration below).
To throttle damper adjustment
1 - throttle damper
2 - adjusting screw