If a scooter engine is running, the transmission belt is moving, but the scooter wheel does not spin even with full throttle, there could be several possible reasons for this issue:
Clutch Slippage: The clutch system in the scooter may be worn out or improperly adjusted, causing slippage. The clutch is responsible for engaging and disengaging the engine power to the transmission. If the clutch is slipping, it fails to transfer the power effectively to the wheels, resulting in a lack of acceleration. In this case, the clutch may need adjustment or replacement.
Transmission Belt Issues: The transmission belt may be worn out, loose, or damaged. A worn or loose belt can cause a loss of power transfer from the engine to the wheels. Inspect the belt for signs of wear, damage, or looseness. If necessary, replace the belt and ensure it is properly tensioned.
Drive Train Problems: The scooter's drive train components, such as the variator, rollers, or clutch pulley, may be damaged or worn, affecting power transmission. A malfunctioning variator or worn-out rollers can prevent the transmission from shifting to the proper gear ratio for acceleration. If the drive train components are faulty, they may need to be inspected and replaced as necessary.
Engine Issues: There could be underlying engine problems that are causing a lack of power. These could include issues such as low compression, fuel delivery problems, ignition system malfunctions, or carburetor issues. It's recommended to have a professional mechanic inspect the engine and its components to diagnose and address any potential engine-related issues.
Brake Binding: Check if the brakes are binding or sticking, as this can prevent the scooter from moving even with full throttle. Ensure that the brake calipers and brake pads are functioning correctly and not causing unnecessary friction or drag on the wheels.
It is advisable to have a qualified mechanic inspect and diagnose the specific problem with your scooter. They will be able to provide a more accurate assessment and suggest the appropriate repairs or adjustments to resolve the issue.