Increased idle speed
1. Connect the tachometer to the engine. Warm up the engine to operating temperature.
2. Remove the air filter and plug the air temperature control vacuum hose.
3. Auto choke should be fully open.
4. Use a screwdriver to fully open the choke on the carburetor, but leave the choke lever in its original position.
5. Start the engine and check the fast idle speed, compare with the data in Specifications. Adjust the coupling lever if necessary.
Engine brake damper (Keihin I)
6. Open the choke control fully.
7. Create a vacuum of 400 mbar in the engine braking unit (photo), then use a drill to check that the gap between the lower edge of the choke and the wall of the carburetor corresponds to the data in the Specifications. Adjust the control lever if necessary.
Engine brake damper (Keihin II)
8. Open the choke control fully.
9. Press the linkage linkage in the engine brake unit, then use a drill to check that the clearance between the bottom edge of the choke and the carburetor wall is within specifications. Adjust the control lever if necessary.
10. The engine braking unit can be checked after removing the tappet and vacuum seal. If the pushrod and inner diaphragm are defective, replace them.
Main Throttle Camera 2 Installation
11. Adjusting screw (photo) is set at the factory and usually does not require adjustment. If the adjustment has been violated, perform the following procedures.
12. With the carburetor removed, fully open chamber 2 throttle, leaving chamber 1 throttle closed.
13. Loosen the nut and turn off the adjusting screw so that there is clearance between the lever and the stopper, then turn the screw clockwise until it touches the stopper. Then turn the screw three-quarters of a turn clockwise. Then tighten the screw using thread blocking fluid.
14. Check up frequency of idling after adjustment.
Camera lock lever gap 2 (Keihin II)
15. With the carburetor removed, fully open the throttle so that the throttle valve is closed.
16. Guided by fig. 3.12, check the installation is correct. If not, adjust as required. Install the new plug in place.
Accelerator pump performance
17. With the carburetor removed, fill the float chamber with fuel to the correct level and test the carburetor over a calibrated container.
18. Fully open the damper. Fully close the throttle valve of chamber 1 by unscrewing the screw.
19. On the Keihin II carburetor, check that the accelerator pump lever touches the plunger - no play is allowed.
20. Open the throttle lever slowly and fully ten times for at least three seconds each stroke.
21. Measure the amount of fuel poured out in ten strokes and compare it with the amount given in the Specifications. Adjust the limiter if necessary.
Throttle channel heating (Keihin II)
22. Unscrew the heating element and turn on the ignition.
23. Connect a diode test lamp between the yellow/black wire and the carburetor body. The lamp should be on.
24. Connect a test lamp between the body of the heating element and the carburettor body. The control lamp should be on.
Overrun block (models with manual transmission)
25. Warm up the engine to operating temperature, then turn it off.
26. Connect the tachometer to the engine.
27. Start the engine, increase the speed to 4000 rpm, then release the engine. The engine speed should slowly drop to 1800 rpm, then quickly drop to idle. If not, check:
- (A) Throttle positioner
- (b) Voltage for control valve
- (V) control valve
Throttle positioner
28. The throttle positioner is located below the damper of the engine braking unit. In an engine at normal operating temperature, connect the vacuum pump to the positioner and generate 350 mbar (Keihin I) or 400 mbar (Keihin II).
29. The engine speed should be 1200-1250 rpm. If not, adjust the provided screw.
30. Check vacuum pipes for leaks.
Control valve voltage
31. Warm up the engine to operating temperature, then turn it off.
32. Connect the tachometer to the engine.
33. Disconnect the connector from the control valve, connect a voltmeter to the two clips in the connector.
34. Start the engine at idle speed. The voltmeter should show battery voltage. If not, check the battery voltage using the black wire on the connector. Connect a voltmeter between the brown/red wire and the positive battery terminal in the same way. Lack of voltage indicates a break in the wiring.
35. Slowly increasing and then decreasing the engine speed, check the switching of the control unit with a voltmeter connected across the two clamps. Above 1900 rpm the voltmeter should show zero, but below 1750 rpm it should show battery voltage. Replace the control unit if necessary.
Control valve
36. Remove the air filter, then start the engine at idle speed.
37. Disconnect the control valve wiring and remove the vacuum tube.
38. On the Keihin I carburetor, disconnect the vacuum hose from the vacuum brake booster hose.
39. Remove the control valve breather cap and attach a piece of hose to the control valve. Blow into the hose and check that it is closed.
40. Connect the wiring to the valve and blow into the hose. The valve must allow air to pass through.
41. On the side of the vacuum chamber, the valve must always be open.
Increased idle speed (models with automatic transmission)
42. Warm up the engine to operating temperature, then turn it off.
43. Connect the tachometer to the engine.
44. Apply the handbrake well, then start the engine at idle speed.
45. Turn on the heated rear window, high beam headlights and heater fan at maximum speed.
46 Depress the brake pedal and select position 'D'. In this position, the throttle positioner should open the throttle slightly. If not, check the vacuum chamber for leakage and check the control valve as follows.
47. Disconnect the wiring from the control valve and connect the test lamp to the clamps in the connector.
48. Turn on the ignition and select position 'N'. The control lamp should be on.
49. Select 'R', 'D', '2' and '1', in these positions the control lamp should not light.
50. Check the control valve as described in points 38-41 inclusive.
Visitor comments