Valve Springs: Removal

Remove valve cover and spark plug on cylinder to be serviced. Be sure piston is at top of stroke with both valves closed. Install air line with adapter in spark plug hole. Apply minimum of 140 psi (9.8 kg/cm² ) line pressure.
NOTE: If air pressure fails to hold valve closed, remove cylinder head for inspection.
Remove required rocker arm and push rod. Use spring compressor to compress valve and remove retainer locks, spring retainer (or rotator) and valve spring. Remove and discard oil seal. Do not remove air pressure or valve will fall into cylinder (if piston has been moved to bottom of stroke).
Check valve spring for out of square with 90° straight edge. Out of square service limit is 1/16". Check valve spring compression pressure. Replace any spring not within 10 lbs. (0.454 kg) of specified load.

NOTE: Valve rotators cannot be disassembled. Replacement is required only when they fail to rotate valve. Rotation may be in either direction.