2008 Arctic Cat 366 ATV Service Manual, Page 41Get this manual
2Remove the valve seal and the lower remaining spring seatDiscard the valve seal 2Acceptable diameter range (intake valve) must be within specifications3Acceptable diameter range (exhaust valve) must be within specificationsMeasuring Valve FaceSeat Width 1Using micrometer, measure the width of the valve face
ATV-1004
2Acceptable width must be at or above specificationsMeasuring Valve Face Radial Runout