With the spark plugs removed and the high-voltage wire of the ignition coil grounded, turn the crankshaft until the oil pressure is detected by the sensor (if provided by design) or until the oil pressure warning light goes out.
Screw in the candles, put on the tips of the wires and the high-voltage wire of the ignition coil.
Make sure the carburetor throttle is closed, then start the engine. The engine should start immediately, after a short period of time necessary for filling the carburetor with gasoline.
Immediately after starting the engine, set the idle speed to high to ensure increased oil pressure in the lubrication system and quickly warm the engine to operating temperature. As the engine warms up, watch closely for oil or coolant leaks.
Switch off the ignition and check the oil and coolant levels.
Start the engine again and check the ignition timing and idle speed. Adjust if necessary.
Drive to low traffic areas, accelerate the vehicle from 50 km/h to 90 km/h by depressing the throttle pedal fully open. Then release the throttle pedal, braking the vehicle with the engine to a speed of 50 km/h. Repeat the cycle 10-12 times. In this case, the piston rings are worn to the cylinder walls. Check the oil and coolant levels again.
Drive 1000 km without putting too much stress on the engine (drive at low speed), by periodically checking the oil level. During the break-in period, increased oil consumption is possible.
After a run of 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 too much or too little load.
After 4000 km of run, change the oil and oil filter again, after which the engine is considered to have been run-in.