2003-2006 Kawasaki KFX400 service manual, Page 52Get this manual
PERIODIC MAINTENANCE
VALVE CLEARANCE
Inspect initially at month and every months thereafterExcessive valve clearance results in valve noise and insufficient valve clearance results in valve damage and reduced powerCheck the intake and exhaust valve clearances at the distances indicated above and adjust the valve clearances to specification, if necessary Remove the seat( 6-4) Remove the fuel tank top cover (L&R)