2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 76Get this manual
MAINTENANCE Clean the valve shim contact area in the valve lifter with compressed air
Measure the shim thickness and record it
Seventy-three different shim sizes are available from 1.200 mm to 3.000 mm in intervals of 0.025 mm
Calculate the new shim thickness using the equation belowA(B-C)A: New shim thickness B: recorded valve clearance C: Specified valve clearance D: Old shim thickness NOTE: Make sure of the correct shim thickness by measuring the shim using micrometer Reface the valve seat if carbon deposits result in calculated dimension of over 3.000 mm 1.80 mm 1.825 mm 1.85 mm 1.875 mm