2007 Arctic Cat Y-12 90cc ATV Service Manual, Page 39Get this manual

2007 Arctic Cat Y-12 90cc ATV Service Manual, Page 39

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2 Using calipers, measure the valve stem diameter that it is within specifications NOTE: To produce the proper 60 cross-hatch pattern, use low RPM drill (600 RPM) at the rate of 30 strokes per minuteI