It is important to use the correct ratio of oil to petrol in a 2-stroke engine to ensure proper lubrication and prevent engine damage. Using too little oil can result in insufficient lubrication, leading to increased wear and tear on engine components, while using too much oil can cause spark plug fouling and other issues.
Always refer to the owner's manual or manufacturer's specifications for the recommended oil-to-petrol ratio for your specific 2-stroke engine.