my rst is fluffing more than missing! IT DOESNT SEEM TO BE ELECTRICAL OR FUELLING,BUT WITH THE ROCKER COVER REMOVED I HAVE NOTICED THAT NUMBER 3 EXHAUST VALVE IS NOT OPENING AS FAR AS THE OTHER EXH VALVES. WHEN I REMOVED THE THE ROCKER ARM AND TURNED IT OVER BY HAND THE HYDRAULIC TAPPET DOES NOT LIFT OUT OF ITS POT AS MUCH AS THE OTHER TAPPETS. IT DOES NOT RATTLE WHEN RUNNING THOUGH!! COULD THIS BE THE CAMSHAFT AT FAULT??????