Why does my kawaski 2000 kx 125 click when in neutral and hard to push?

The clicking sound in your Kawasaki 2000 KX 125 while in neutral could indicate issues with the transmission or clutch, such as worn or damaged components. Difficulty pushing the bike may suggest that the clutch is not fully disengaging or that there is internal resistance in the transmission. It's advisable to check the clutch adjustment and inspect the transmission for any signs of wear or damage. If the problem persists, consulting a qualified mechanic would be a good step for a thorough diagnosis.