I doubt anyone would guess. In neutral, on the side stand ticking over in the garage. Big metal hammering bang, then I couldn't spin the clutch freely. On stripping the whole motor, I found one roller, of one needle roller bearing, on one gear had a flat on it. The resultant damage caused by this picking up on the shaft and crunching 2 gears together removed 2 teeth from one gear and 1 from the other. Highlighted a bunch of other faults too though there from manufacture. And this is on an SPS which wasn't a cheap toy when new. SORRY FOR THREAD JACKING A BIT. :Shamefullyembarrased: