With the spark plugs removed and the high-voltage wire of the ignition coil connected to ground, turn the crankshaft until the oil pressure is registered by the sensor (if provided for by design) or until the oil pressure warning light goes out.
Screw in the spark plugs, put on the wire caps and connect the high-voltage wire of the ignition coil.
Make sure the carburetor throttle is closed; then start the engine. The engine should start after a short period of time, which is necessary for the carburetor to fill with gasoline.
Immediately after starting the engine, the idle speed should be set to high to ensure increased oil pressure in the lubrication system and rapid warm-up of the engine to operating temperature. As the engine warms up, watch closely for oil and coolant leaks.
Turn off the ignition and check the oil and coolant levels. Start the engine again and check the ignition timing and idle speed. Adjust them if necessary.
Drive on a section of highway with light traffic, accelerate the car from 50 km/h to 90 km/h by pressing the accelerator pedal all the way. Then release the accelerator pedal, braking the car with the engine to a speed of 50 km/h.
Repeat the cycle 10–12 times. This will help the piston rings become more comfortable against the cylinder walls. Recheck the oil and coolant levels.
Do not subject the engine to heavy loads during the first 1000 km of driving (move at low speed), checking the oil level periodically. During the break-in period, increased oil consumption is possible.
After 1000–1200 km, change the oil and oil filter, tighten the cylinder head bolts and check the clearances between the valves and rocker arms.
For the next few hundred kilometers, drive the vehicle normally, avoiding excessive or excessive loads.
After 4000 km of running, change the oil and oil filter again, after which the engine is considered to have been run in.