2003 Bombardier Rally 200 Service Manual, Page 135Get this manual
Subsection 08
Section 03 ENGINE (CYLINDER AND HEAD)
VALVE STEM DIAMETER mm (in) NEW MINIMUM EXHAUST INTAKE 3.96 mm (.1559 in) 3.97 mm (.1563 in) NEW MAXIMUM EXHAUST INTAKE 3.97 mm (.1563 in) 3.98 mm (.1567 in) SERVICE LIMIT EXHAUST INTAKE 3.940 mm (.1551 in)
Check valve face and seat for burning or pittings and replace valve or cylinder head if there are signs of damageEnsure to seat valves properlyApply some lapping compound to valve face and work valve on its seat with lapping tool (see VALVE GUIDE PROCEDURE below)Measure valve face contact widthNOTE: The location of contact area should be in center of valve seatMeasure valve seat width, using caliperVALVE SEAT CONTACT WIDTH mm (in) NEW EXHAUST INTAKE 1.25 to 1.55 mm (.049 to .061 in) 1.05 to 1.35 mm (.041 to .053 in) SERVICE LIMIT EXHAUST INTAKE mm (.078 in) 1.8 mm (.07 in)