Yes, it is generally not recommended to downshift directly from 5th gear to 1st gear on a motorcycle while the motorcycle is in motion. Downshifting multiple gears at once can cause abrupt and potentially dangerous changes in engine speed (RPM) and can put excessive stress on the drivetrain components, particularly the clutch, transmission, and engine.
Downshifting through the gears sequentially (from 5th to 4th, then to 3rd, and so on) allows the engine speed to gradually match the speed of the lower gear. This gradual transition helps maintain control over the motorcycle and prevents sudden jolts or excessive stress on the drivetrain.
Downshifting directly from 5th to 1st gear, especially at higher speeds, can cause the engine RPM to spike suddenly. This rapid increase in engine RPM can lead to engine damage, loss of traction, rear-wheel skidding, or even loss of control of the motorcycle.
It is best to follow the recommended gear shifting sequence and downshift one gear at a time, gradually matching the engine speed to the appropriate gear and road speed. This approach ensures smoother and safer operation of the motorcycle while minimizing stress on the drivetrain components.