2005 Ski-Doo Tundra, Skandic, Expedition Shop Manual, Page 233Get this manual
Section 04 ENGINE (4-TEC) Subsection 05 (CYLINDER AND CYLINDER HEAD)
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
R1004motr72A
1Spark plug tube 2Seal to the valve cover 3Seal to the cylinder head
Measure rocker arm bore diameterIf diameter is out of specification, change the rocker arm assemblyROCKER ARM BORE DIAMETER MINIMUM (NEW) MAXIMUM (NEW) SERVICE LIMIT 20.007 mm (.7877 in) 20.020 mm (.7881 in) 20.035 mm (.7887 in)