2002 Bombardier Quest 650XT Service Manual, Page 112Get this manual
Subsection 08
Section 03 ENGINE (CYLINDER AND HEAD)
Inspection
Check valve spring for rust, corrosion or other visible damagesIf so, replace valve springCheck valve spring for free length and straightnessReplace valves if not within specifications
Removal
Remove valve springPush valve stem then pull valves no40 and no41 out of valve guideR610motr122A
AValve spring length
VALVE SPRING FREE LENGTH NEW NOMINAL SERVICE LIMIT 45.45 mm (1.789 in) 43 mm (1.693 in)