I've had my bike for about 6 months now and changed the oil and filter at 600 miles I have 1300 miles on it and now the engine sounds clickedy (I know made up word) theres no power loss just the sound I run around 6000 rpm, anyone else notice this is it normal or should I take it in to the dealer(have 6 more months under warranty). also only in 5th gear it whistles don't know why any input would be appreciated.