I have a 2006 TW with 2000 miles and have shimmed the needle, 130 main, 2 1/2 out on the pilot, adjusted the valves to the correct TDC setting on the gear. I still have a slight tapping noise at idle and high rpm. I would like to try to change the timing setting. Is there a way to advance/retard the timing setting? The timing chain looked tight when I took the cover off and no adjustment on the auto tensioner. I run non ethanol super premium.