2004 Bombardier DS650/DS650 Baja/DS650 Baja X Shop Manual, Page 106Get this manual
Section 03 ENGINE Subsection 08 (CYLINDER AND HEAD)
Measure valve seat width, using caliperVALVE SEAT CONTACT WIDTH SERVICE LIMIT Exhaust Intake 1.8 mm (.07 in) 1.6 mm (.06 in)
Inspection
Inspection of valve stem seals is not needed as new seals should always be installed whenever cylinder head is diassembled
Installation
For installation, reverse the removal procedure
If valve seat contact width is too wide, too narrow or has spots, the seat must be ground or cylinder head replaced
VALVE GUIDE
Inspection
Insert new valve in valve guide until it contacts the sealNOTE: Clean valve guide to remove carbon deposits before measuringMeasure the maximum tilt clearance with dial gauge placed as shown in the following illustration