2003 Suzuki LT-Z400 Factory Service Manual, Page 17Get this manual
ADJ The clearance is the shim with thicker or tllinner shirn Remove the intake or exhaust camshafts0) Remove Ule and shim hand or with magnet
" Check the nurnbers printed on the shim, These numbers indicate the thickness of the tappet as illustrated Select tappet shim that will the proper clearanceshims are available in 25 from 2.30 to 3.50 mm to 0.14 in increments of 0.05 mrn shim at the valve stem end, with the numbers towards the Be sure to measure the shim with micrometer to ensure that it is of the proper sizeRefer to the shim selection table for details,
NOTE:Be sure to apply molybdenum oil solution to the and bottom faces of the shim,When the tappet shim, make sure that the side with the numbers face towards the tappet: