1. Twin-Cooled models: Remove lines and fittings from cylinder head. See C.5 COOLING SYSTEM REPAIR, Upper Coolant Line Removal.
2. Before proceeding with the disassembly procedure, determine if valve reconditioning is necessary. Use either of the following procedures:
a. Raise valve ports of cylinder head to strong light source. If light is visible between valves and seats, the cylinder head and valves require reconditioning.
b. Fill ports with solvent. Wait ten full seconds and check for leakage past valve seats. Recondition cylinder heads and valves that leak.
3. See Figure 3-38. Secure cylinder head for service.
a. Thread 12 mm end of CYLINDER HEAD HOLDING FIXTURE (Part No. HD-39786) (1) into cylinder head (2) spark plug hole.
b. Clamp tool in vise at a 45 degree angle or one that offers a comfortable working position.
4. See Figure 3-39. Release valve spring compression.
a. Place VALVE SPRING COMPRESSOR (Part No. HD-34736-B) (2) over cylinder head. Center blunt end on the valve head. Seat adapter at end of forcing screw on the valve spring retainer.
b. See Figure 3-40. Rotate forcing screw to compress valve spring until keepers (1) can be removed from the valve stem (11).
c. Rotate forcing screw to release the valve spring compression.
5. Remove the spring retainer (2) and valve spring (3).
6. Slide the valve (11) from the valve guide (5).
7. Remove valve seal assembly.
8. Mark the valve head F(ront) or R(ear) for identification. Also, separate and tag tapered keepers, valve spring and spring retainer so that they are installed on the same valve at time of assembly.
9. Remove the remaining valve and components.
10. Remove fixture tool from spark plug hole.
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