Use a cleaning reamer to remove carbon deposits on the valve guides.
Insert new valve. The end of the valve stem must not protrude from the guide.
Warning: Due to different stem diameters, use inlet valves in inlet guides only and outlet valves in outlet guides only.
Using a linear movement indicator, measure the amount of movement of the valve disc as it swings.
Wear limit: inlet valve guide - 1.0 mm, exhaust valve guide - 1.3 mm.
If the travel is larger, have the valve guides replaced by a workshop.
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