have had this bike all its life, maintenance always up to date, oil change every 3000km. went for a ride today and all of a sudden started running weird, lots of engine chatter near the clutch. red oil pressure came on and the bike stalled. every time I start the bike it does this loud wild squealing noise and then shuts off after about 7 to 8 seconds. if anyone has any input or wisdom as to what this might be? Sprag? Bearing? it was running fine until today.