2005 Ski-Doo Tundra, Skandic, Expedition Shop Manual, Page 263Get this manual
Section 04 ENGINE (4-TEC) Subsection 06 (CRANKSHAFTDRIVE GEARS)
CAUTION: Ensure that top and second rings are not interchangedNOTE: Use ring expander to prevent breakage during installationThe oil ring must be installed by handCheck that rings rotate smoothly after installationSpace the piston ring end gaps 120 apart and do not align the gaps with the piston pin bore or the thrust side axisA A