Vehicle frequently stalls or engine stops suddenly. Engine will "knock" and suddenly stall when engaging the clutch while providing throttle to begin riding. It will stall when engaging the clutch to downshift into lower gears while coming to a stop. This has happened at busy roadways at red lights, stop signs, and even when slowing down to navigate a turn. Engine may stall while in neutral and throttle is applied. Typically a short rattle or what sounds like valves knocking, is followed by a backfire, prior to stalling. There is no way to prevent stalling/engine stopping unless RPM's are kept over 3,000. I have fallen over or crashed offroad several times, when navigating obstacles or negotiating tight turns or turn-arounds in the trails, dirt roads or forest. Bike stalled when attempting to navigate over a small log, resulting in bike crashing and pinning me underneath. Dealer performed update to most current fuel/mapping software but this did not make a difference.