2008 Arctic Cat 400/500/650/700 ATV Service Manual, Page 166Get this manual
Servicing ValvesValve GuidesValve Seats If valves, valve guides, or valve seats require servicing or replacement, Arctic Cat recommends that the components be taken to qualified machine shop for servicing ! CAUTION
If valves are discolored or pitted or if the seating surface is worn, the valve must be replacedDo not attempt to grind the valves or severe engine damage may occur
ATV1082A
3Rotate the valve in the blocks4Maximum runout must not exceed specificationsMeasuring Valve GuideValve Stem Deflection (Wobble Method) 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
Measuring Rocker Arm (Inside Diameter) 1Using dial calipers, measure the inside diameter of the rocker arm2Acceptable inside diameter range must be within specificationsMeasuring Rocker Arm Shaft (Outside Diameter) 1Using micrometer, measure the outside diameter of the rocker arm shaft2Acceptable outside diameter range must be within specificationsInstalling Valves 1Apply grease to the inside surface of the valve seals; then place lower spring seat and valve guide seal over each valve guide