Drivetrain
The drivetrain or drive system consists of the chain which transmits power from the gearbox to the wheels, and sprockets which mesh with the chain.
1. Incorrect chain tension: If the tension in the chain is too high, it causes the clutch to slip and damage it. If it is too low, it leads to decreased power supply to the rear wheel.
2. Chain comes off the sprockets: This could be due to low chain tension, or broken sprocket teeth. If it is the latter, it can cause vibrations in the gearbox and rear wheel, which in turn can cause huge problems later on.