2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 324Get this manual
Measuring Valve Stem Outside Diameter
3Rotate the valve in the blocks4Maximum runout is 0.03 mm (0.001 inMeasuring Valve GuideNalve Stem Deflection (Wobble Method)
1Using micrometer, measure the valve stem
outside diameter2Acceptable diameter range (intake valve) is 4.9754.990 mm (0.19590.1965 in3Acceptable diameter range (exhaust valve) is 4.9554.970 mm (0.19510.1957 inMeasuring Valve FaceSeat Width
1Mount dial indicator and base on the surface plate; then place the cylinder head on the surface plate2Install the valve into the cylinder head; then position the dial indicator contact point against the outside edge of the valve faceZero the indicator
1Using micrometer, measure the width of the
valve face
ATV-1004
3Push the valve from side to side; then from top to
bottom4Maximum "wobble" deflection is 0.35 mm (0.014
2Acceptable width (0.035-0.043 in