2004 John Deer Buck Utility ATV 500, 500EX and 500EXT Service Manual, Page 101Get this manual
For installation, reverse the removal procedurePay attention to the following detailsColored area of the valve spring must be placed on top Valve Seat Contact Width mm (in) New Exhaust Intake Service Limit 1.25 to 1.55 mm (0.049 to 0.061 in 1.45 to 1.75 mm (0.057 to 0.069 in
Remove valve spring no13Push the valve stem then pull valve no16 out of valve guide
Exhaust Intake
2 mm (0.078 in 1.8 mm (0.07 in
If valve seat contact width is too wide, too narrow or has spots, the seat must be ground or cylinder head replacedValve: Inspect valve surface, check for abnormal stem wear and bendingIf so, replaceValve Stem and Valve Guide Clearance: Check valve stem and valve guide for wear or friction surfaces, if so, replace partsMeasure valve stem and valve guide in three places, using micrometer and small hole gauge