2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 30Get this manual
0B-6 Maintenance and Lubrication: 8) Insert the thickness gauge between the tappet and the camIf the clearance is out of specification, adjust it to the specified rangeNOTE The valve clearance specification is different for both intake and exhaust valvesSpecial tool (A): 0990020803 (Thickness gauge) Valve clearance (When cold) IN 0.10 0.20 mm (0.004 0.008 in) EX 0.20 0.30 mm (0.008 0.012 in) 3) Check the figures printed on the shimThese figures indicate the thickness of the shim, as illustrated 300
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4) Select replacement shim that will provide clearance within the specified rangeFor the purpose of this adjustment, total of 25 sizes of tappet shim are available ranging from 2.30 to 3.50 mm in steps of 0.05 mm