There can be several reasons why a motorcycle engine revs but the motorcycle doesn't move. Here are a few possibilities:
Clutch Issues: The clutch may not be engaging properly, preventing power from transferring from the engine to the wheels. This can be caused by a worn-out clutch plate, broken clutch cable, or a hydraulic clutch system malfunction.
Transmission Problems: Issues with the transmission can also cause the motorcycle not to move. It could be due to a broken gear, a worn-out gear linkage, or problems with the transmission fluid.
Chain or Belt Issues: If your motorcycle has a chain or belt drive system, a broken or loose chain/belt can prevent power transfer to the rear wheel.
Gear Shifting: Improper shifting technique or gear selection can cause the motorcycle to rev without moving. Make sure you are in the correct gear and that the gear engages properly.
Drive Shaft Problems: Motorcycles with a drive shaft can experience issues such as a broken drive shaft or faulty universal joints, leading to a lack of power transmission.
Clutch Cable or Hydraulic System Failure: If the clutch cable is loose, broken, or improperly adjusted, it can prevent the clutch from engaging. Similarly, in motorcycles with hydraulic clutch systems, a malfunction can cause the same issue.
Engine Problems: In some cases, the engine itself may have a problem that prevents power from reaching the wheels. This could include issues such as a worn-out or slipping belt in a belt-driven system, a malfunctioning throttle, or a damaged engine component.
It is recommended to consult a professional motorcycle mechanic to diagnose and fix the specific issue with your motorcycle. They will be able to inspect the motorcycle thoroughly and provide an accurate diagnosis.