2007-2009 Suzuki LTZ90 factory service manual, Page 20Get this manual
PERIODIC MAINTENANCE
Insert thickness gauge between the valve end the adjusting screw on the rocker arm If the clearance is out of specification, adjust it to the specified range09900-20806: Thickness gauge 09917-14910: Tappet adjust drive Valve clearance (when cold): IN: 0.05 0.10 mm (0.002 0.004 in) EX: 0.10 0.15 mm (0.004 0.006 in) Valve clearance adjuster locknut: 10 Nm (1.0 kgf-m, 7.0 lb-ft)