If a motorcycle engine is called the heart, the carburetor can rightly be called heart valves. Not only fuel consumption, but also the acceleration dynamics of equipment depends on its correct and timely adjustment.
It is necessary
- - wooden cork
- - drill
Instructions
Step 1
Adjust the position of the floats. To do this, remove the carburetor and turn it over, having previously disconnected the bottom of the float chamber. If the floats do not lie in the same plane, bend the base of one of them so that the discrepancy between them does not exceed 0.5 mm.
Step 2
Set the fuel level by bending the tongue of the float so that the distance from its remote edge is 26 mm. Note that this indicator is applicable for flat terrain where the altitude is not higher than 1000 m. At an altitude that is twice this level, the target is 28 mm.
Step 3
Adjust the trigger. Set the needle to the lowest position. Check how easily the shifter on the handlebars moves. If necessary, disassemble, lubricate and reassemble. Reinstall the carburetor.
Step 4
Warm up the engine to operating temperature before adjusting idle speed. Raise the throttle with the stop screw so as to increase the crankshaft speed. Screw in the mixture "quality" screw until the end, without applying significant force, and then unscrew it one or one and a half turns.
Step 5
Along the way, check the ease of movement of the throttle in the grooves, make sure there is no excessive play in the well. The U-shape of the throttle makes it possible to eliminate backlash to some extent by bending and unbending it.
Step 6
Place the motorcycle on the center stand, gradually lower the throttle valve with the “amount” screw. Ensure that the speed is reduced to the lowest stable rate. Then remove the “quality” screw until it increases. Again, in the same way, reduce and increase the speed, leaning the mixture.
Step 7
After setting the minimum speed, tighten the “quality” screw half a turn. This will make the engine idle more stable.
Step 8
Within the range of throttle movement from 1/3 to 3/4 (by turning the throttle handle or lifting height), the position of the needle has the greatest effect on engine operation. To determine how correct it is, after driving about 25 km, stop the motorcycle and remove the spark plugs.
Step 9
Pay attention to the color of the center electrode insulator. If it is pale gray, raise the dispensing needle; if black, put it down. A dark gray or light brown color is considered normal, indicating that the candle is not overheating.
Step 10
When the position of the needle is selected, it will be possible to take care of the greater economy of the carburetor. To do this, you will need to lower the needle one division.
Step 11
The last stage of adjustment is the correct selection of the main fuel jet. Measure the maximum speed with the standard jet installed. Place a drilled wood plug into the carburetor inlet. Its diameter should be 20% less than the diameter of the inlet. If the speed after this has decreased significantly, the performance of the jet is high, if it has decreased, the performance is low. If there is no significant change in speed, the jet does not need to be changed.
