If your new motorized bike engine is not starting despite having spark and fuel, there could be several possible reasons for this issue. Here are a few common troubleshooting steps you can take:
Check the Fuel Mixture: Ensure that the fuel mixture you are using is correct and properly mixed. Motorized bike engines typically require a specific fuel-to-oil ratio, and using an incorrect mixture can prevent the engine from starting. Consult the engine's manual or manufacturer's recommendations to ensure you have the right fuel mixture.
Fuel Flow: Verify that fuel is reaching the engine properly. Check the fuel line for any blockages or restrictions. Ensure that the fuel valve is in the "on" position, allowing fuel to flow to the carburetor. If there's a fuel filter, make sure it is clean and not clogged.
Carburetor Issues: The carburetor plays a crucial role in mixing fuel and air for combustion. It may be necessary to clean or adjust the carburetor if it is dirty or misadjusted. Check for any clogs in the carburetor jets or passages that may be obstructing fuel flow.
Spark Plug Condition: Even though you mentioned that there is spark, it's still worth checking the spark plug. Remove the spark plug and inspect its condition. If the spark plug is fouled, damaged, or excessively worn, it may need to be replaced. Additionally, ensure that the spark plug gap is correctly set as per the manufacturer's specifications.
Ignition System: Verify that the ignition system is functioning properly. Check the wiring connections from the magneto or CDI (Capacitor Discharge Ignition) unit to the spark plug. Look for any loose or damaged wires that may be affecting the spark.
Compression: Low or insufficient compression can also prevent the engine from starting. Ensure that the cylinder head and gasket are properly seated, and there are no leaks or compression losses. A compression test can help determine if this is an issue.
Air Filter: Check the air filter for any dirt or blockages that may restrict airflow to the engine. A clogged air filter can affect the fuel-air mixture and hinder the engine's starting.
If you have checked all these factors and the engine still doesn't start, it may be necessary to consult a professional mechanic or contact the manufacturer for further assistance. They will have specific knowledge about the engine model and may be able to provide additional guidance for troubleshooting and resolving the issue.