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1. Remove the plug (drawing on the left), located on the clutch housing, so that the installation marks are visible (indicated by the arrow in the figure on the right) on the flywheel and the plate screwed to the crankcase.
2. Start the engine, warm it up to operating temperature, then turn it off.
3. Remove the vacuum hose from the ignition distributor and plug it.
4. Connect the stroboscope according to the instructions.
5. Start the engine in idle mode and direct the stroboscope at the marks. The flywheel timing mark should align with the mark on the plate, which indicates the degrees of offset of the ignition timing from top dead center (TDC).
6. If adjustment is necessary, loosen the distributor mounting nuts and slowly turn it until the corresponding marks are aligned.
7. After aligning the marks, tighten the distributor mounting nuts and recheck the ignition timing angle.
8. Increase the engine speed and make sure that the marks start to move towards a greater advance angle. This shows that the centrifugal advance angle regulator is working.
9. Install the vacuum hose in place and check the ignition timing at increased engine speeds. The marks should shift even more. This shows that the vacuum ignition timing regulator is working.