The phenomenon you are referring to, commonly known as a "back kick" or "kickback," can occur in motorcycles, including bullet bikes, under certain circumstances. The back kick is typically associated with the sudden release of stored energy in the engine and drivetrain when specific conditions are met. Here are a few potential reasons for the occurrence of a back kick:
Engine braking: Bullet bikes and many high-performance motorcycles have powerful engines with significant compression. When you abruptly close the throttle while the engine is running at high RPMs, the engine braking effect intensifies. This sudden reduction in throttle input can cause the rear wheel to lock momentarily, leading to a kickback sensation.
Downshifting at high RPMs: Downshifting gears at high engine RPMs can generate a higher rate of engine braking. The rapid deceleration caused by this aggressive downshifting can induce a forceful back kick due to the sudden release of energy.
Improper clutch control: If the clutch engagement or disengagement is not smooth or precise, it can result in a sudden transfer of power to the rear wheel, causing a back kick. This can happen when releasing the clutch too quickly or engaging it abruptly without proper throttle control.
Wheel lock or traction loss: In certain situations, such as during hard braking or acceleration on a low-traction surface, the rear wheel can momentarily lose traction and then regain it abruptly. This can cause the bike to jerk or kickback due to the sudden change in forces.
It's important to note that experiencing a back kick on a motorcycle can be potentially dangerous, as it may affect the stability and control of the bike. To minimize the risk, it's essential to practice smooth throttle control, proper downshifting techniques, and maintain a good understanding of your motorcycle's behavior in various situations. Additionally, being aware of road conditions and practicing safe riding habits can help mitigate the chances of encountering a back kick.