Why would a harley 6 speed make a crashing noise going into gear when shifting up or down?

A Harley's 6-speed transmission may make a crashing noise when shifting up or down due to several factors, including improper clutch engagement, worn or damaged gears, or insufficient lubrication. If the clutch isn't fully disengaging, it can cause the gears to grind during shifts. Additionally, if the Transmission Fluid is low or contaminated, it can lead to poor gear engagement. It's important to diagnose the issue promptly to prevent further damage to the transmission.