Checking the centrifugal governor
Connect stroboscope.
Remove the vacuum hose from the distributor.
Start the engine.
Direct the strobe lamp to the ignition setting mark (see below «Ignition timing check»).
The notch on the flywheel should move, and when you return to idle speed, return to the original mark again.
Checked the vacuum regulator
To check, remove the hose from the vacuum chamber and plug it with your finger.
Start the engine with the help of an assistant and accelerate to medium speed (about 300 rpm).
At the same speed, reconnect the hose to the vacuum chamber.
Since air is now sucked out of the intake pipe through the hose, the vacuum regulator must come into action in this load area, due to which the engine speed should increase noticeably without changing the position of the gas pedal.
If the engine does not run faster, then there is probably a leak in the hose or in the vacuum chamber.
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