2. Insert a paper clip from the wire side into contact 1 of the tachometer connector (Fig. 3.9).
Fig.3.9. Location of the tachometer connector
3. Connect the tachometer wire to the paper clip installed in the connector.
Warning: Do not use the MUT-II device. If the MUT-II device is connected to the diagnostic connector, it will show the current ignition timing angle, not the main one.
4. Connect the strobe light according to its operating instructions.
5. Start the engine and let it idle.
6. Check the idle speed
Engine crankshaft speed at idle: 750±100 min⁻¹
7. Turn off the ignition.
8. Remove the waterproof plug from the brown main ignition timing adjustment connector.
9. Connect the jumper to the clamp with the contact for adjusting the main ignition timing angle of the connector and use the clamp to connect the jumper to the ground (Fig. 3.10).
Fig. 3.10. Installing a jumper to check the main ignition timing angle
Note: Connecting this connector pin to ground switches the engine to the main ignition advance mode.
10. Start the engine and let it idle.
11. Check the basic ignition timing.
Main ignition advance angle: 5±2° before TDC
12. If the main ignition timing angle does not correspond to the required one, loosen the ignition distributor mounting bolt and, by rotating the ignition distributor, set the required main ignition timing angle.
13. After adjusting the main ignition timing angle, tighten the distributor mounting bolt.
Tightening torque: 12 Nm
14. Turn off the engine and remove the jumper from the main ignition timing adjustment connector (brown) and replace the waterproof plug.
15. Start the engine and check the ignition timing.
Ignition timing: approximately 10° before TDC
Note
(1) The ignition timing angle setting varies within ±7° even under normal engine operation.
(2) The ignition timing advance angle is automatically increased by approximately 5° to 10° as the altitude increases.