2004 Skidoo ZX Series Service Manual, Page 261Get this manual
Section 05 ENGINES (4-TEC) Subsection 06 (CYLINDER AND CYLINDER HEAD)
Crank the engine further until the second cylinder is positioned at ignition TDC rocker arm shaft screws no45 (discard screws) rocker arm shaft no42 with rocker arm assembly (exhaust side no43 and intake side no44)
Inspection
Spark Plug Tube Check seals on spark plug tubeIf seals are brittle, cracked or hard, replace spark plug tube.R1004motr74A
1Rocker arm (exhaust side) 2Roller ABore for rocker arm shaft
Measure rocker arm bore diameterIf diameter is out of specification, change the rocker arm assemblyR1004motr72A
ROCKER ARM BORE DIAMETER MINIMUM (NEW) MAXIMUM (NEW) SERVICE LIMIT 20.007 mm (.7877 in) 20.020 mm (.7881 in) 20.035 mm (.7887 in)
1Spark plug tube 2Seal to the valve cover 3Seal to the cylinder head