21. The 1750 TBi gasoline and 16V Multijet diesel engines feature hydraulic tappets with roller rocker arms . 22. The new cylinder heads also featured stud-mounted rocker arms , a change from the shaft-mounted LA arms. 23. From 1991, the GSF400V received variable inlet timing via solenoid-controlled rocker arm engaging with supplementary cams. 24. Each exhaust valve on the J37A4 corresponds to one primary and one secondary exhaust rocker arm . 25. The intake and exhaust rocker shafts contain primary and secondary intake and exhaust rocker arms , respectively. 26. The rocker arm oil supply pipe was steel, and would fracture from vibration ( later improved ). 27. A user would place his feet on the pedals and swing the rocker arms back and forth. 28. Therefore, there are a total of twelve primary exhaust rocker arms and twelve secondary exhaust rocker arms. 29. When a cylinder is deactivated, solenoid-controlled oil pressure releases a locking pin between the two rocker arms . 30. Therefore, there are a total of twelve primary exhaust rocker arms and twelve secondary exhaust rocker arms .
