If your 110cc bike engine smells like burning tar after changing the engine oil, it could be an indication of a potential issue. Here are a few possible reasons for the burning smell:
Incorrect Oil Grade or Type: Using the wrong grade or type of engine oil can lead to excessive friction and heat generation, resulting in a burning smell. Ensure that you are using the correct oil recommended by the manufacturer and that it meets the required specifications.
Oil Leakage: Check for any signs of oil leakage around the engine, oil filter, or drain plug. If there is an oil leak, it could be dripping onto hot engine components and causing the burning odor. Inspect the seals, gaskets, and connections to identify and fix any leaks.
Overfilled Oil Level: Overfilling the engine oil can cause it to reach areas it shouldn't, such as the exhaust or hot engine parts. This excess oil can burn off, producing the burning smell. Ensure you are adding the recommended amount of oil specified in the owner's manual.
Oil Spillage During Oil Change: If there was an oil spillage or any oil dripped onto the engine or exhaust system during the oil change, it can lead to the burning smell. Clean any oil spills thoroughly and ensure that no oil is coming into contact with hot components.
Engine Issues: The burning smell could be a symptom of an underlying engine problem, such as a malfunctioning component or excessive friction. If the smell persists even after addressing the above possibilities, it would be advisable to have a mechanic inspect the engine for any potential issues.
Remember, unusual smells from the engine should not be ignored, as they can indicate problems that require attention. It is recommended to consult with a qualified mechanic or a service center to diagnose and address the issue properly.