Was riding the other day and heard a small pop then bike went down to what feels like 2cyl. No CEL or any other noises. I'm hoping it's not a valve issue but was wondering if anyone else has experienced this? Could it just be coils or plugs (Long shot but I'm hoping)? Bike has 10,900 miles and when I drained oil I have no metal flakes in the oil, oil looks clean and drain plug did not have any abnormal metal shavings.