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1. Hole in the sprocket for chain lubrication; 2. Main channel in the camshaft; 3. Channel in the camshaft cam; 4. Annular groove on the middle bearing neck of the camshaft; 5. Oil filler neck; 6. Channel in the camshaft bearing journal; 7. Inclined channel in the cylinder head; 8. Channel for supplying oil to the gas distribution mechanism; 9. Main oil line in the cylinder block; 10. Sensor control lamp oil pressure; 11. Oil supply channel to the main bearing; 12. Oil supply channel to the connecting rod bearing; 13. Oil sump; 14. Oil filter; 15. Bypass valve; 16. Cardboard filter element; 17. Anti-drainage valve; 18. Oil pump; 19. Oil supply channel from the pump to the filter; 20. Channel for supplying oil from the filter to the main oil line; 21. Oil supply channel to the oil pump drive gear bushing; 22. Front crankshaft oil seal; 23. Oil supply channel to the main bearing and to the oil pump drive shaft; 24. Oil pump drive shaft and ignition distributor; 25. Inlet pipe; 26. Throttle valve of the second chamber of the carburetor; 27. Throttle valve of the first chamber of the carburetor; 28. Air filter; 29. Exhaust ventilation manifold; 30. Flame arrester; 31. Hose for suction of crankcase gases into the throttle space of the carburetor; 32. Exhaust hose; 33. Oil level indicator; 34. Oil separator cover; 35. Oil separator; 36. Drain tube; I. Engine crankcase ventilation scheme