There can be several reasons why it may take multiple attempts to downshift a gear on a Kawasaki NS160 motorcycle. Here are a few possible explanations:
Clutch Issues: The clutch may not be fully disengaging when you pull in the clutch lever, which can make it difficult to downshift smoothly. This could be due to a worn clutch cable, improper adjustment of the clutch lever, or a problem with the clutch plates.
Gear Synchronization: Sometimes, the gears in the transmission may not be properly synchronized, especially when downshifting at higher speeds. This can make it challenging to engage a lower gear smoothly, and you may need to rev match or let the engine RPM drop before attempting the downshift again.
Improper Technique: Downshifting requires proper timing and technique. If you release the clutch too quickly while downshifting, it can cause the gear to grind or the engine to stall. It's important to match the engine RPM to the lower gear and smoothly release the clutch to achieve a smooth downshift.
Transmission or Gearbox Issues: If there are problems with the transmission or gearbox, such as worn-out gears or damaged synchros, it can affect the smoothness of gear shifting. This can result in difficulty downshifting, especially when the transmission is under load.
Riding Conditions: Downshifting can be more challenging under certain riding conditions, such as when you're riding at high speeds or when the motorcycle's engine is cold. These factors can affect the responsiveness of the transmission and make downshifting less smooth.
If you're experiencing persistent difficulties with downshifting on your Kawasaki NS160, it's recommended to have the motorcycle inspected by a qualified mechanic. They can diagnose and address any mechanical issues that may be causing the problem.