2008 Can-Am DS450 EFI, DS450 EFI X Shop Manual, Page 110Get this manual
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Section 03 ENGINE Subsection 07 (CYLINDER HEADCYLINDER)
0.15 to 0.40 mm (.0059 to .0157 in) 1.00 mm (.0394 in)
SERVICE LIMIT
PISTON RINGS
Piston Rings Removal