2003 Bombardier Outlander 400 Factory Service Manual, Page 133Get this manual
Subsection 09
Section 03 ENGINE (CYLINDER AND HEAD)
Ensure 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 NEW EXHAUST INTAKE 1.25 to 1.55 mm (.049 to .061 in) 1.15 to 1.35 mm (.045 to .053 in) SERVICE LIMIT EXHAUST INTAKE mm (.078 in) 1.8 mm (.07 in)
CAUTION: Be careful when valve stem is passed through sealing lips of valve stem seal1 2
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1Thrust washer 2Sealing lips of valve stem seal
If valve seat contact width is too wide or has dark spots, replace the cylinder head
To ease installation of cotters, apply oil or grease on them so that they remain in place while releasing the springAfter spring is installed, ensure it is properly locked by tapping on valve stem end with soft hammer so that valve opens and closes few timesCAUTION: An improperly locked valve spring will cause engine damage