Why Does the Motorcycle Stall When Shifting Gears?

[McEleanor]

Motorcycle stalling when shifting gears may be caused by issues such as the stand not being retracted, the clutch not being pulled, or low oil viscosity. Stand Open: For motorcycles equipped with a side stand safety switch, the engine will stall when shifting gears if the stand is open. This is designed to prevent accidents where the rider forgets to retract the stand and rides off, causing the stand to scrape the ground on uneven roads or during left turns, leading to a crash. Clutch Not Pulled: If the stalling is not caused by an open stand, it may be due to the clutch not being fully engaged. The motorcycle may start normally in neutral but stall when shifted into gear because the clutch fails to fully disengage. At idle speed, the engine lacks sufficient power to overcome the vehicle's mass and stalls. Using Low-Quality Oil: Another scenario involves using low-quality oil during summer, especially if the motorcycle has been unused for half a year. When attempting to ride in winter, the engine may start but stall when shifting gears. Poor-quality oil thickens significantly as temperatures drop, preventing the clutch from disengaging properly.