1. the two cylinders
2. combustion chamber
3. crank chamber
4. pistons
5. rods
6. crank pins
7. disk
8. crank shafts
9. thooted wheels
10. counter balance weights
11. pipe
12. needle valve / fuel valve
13. needle valve
14. spring
15. port
16. exhaust port^[1]
17. counter balance weights
18. sparking plug
19. throttle valve
20. (silencing) chamber
21. hole
    

30. lubricating tubes
31. oil traps
32. draw of cocks

1. ↑ There is only one exhaust port for the two cylinders

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