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Piston (Fig. 1) 1. Remove the intake valve as explained in Intake Valve. 2. Pull the cylinder (38) down, off the piston assembly. 3. Unscrew the piston retainer screws (25). Remove the piston parts from the displacement rod (36). 4. Clean all parts thoroughly, and inspect them for wear or damage. Replace parts as needed. 5. Place the gasket (49) and ball (16) on the piston retainer (43). Install these parts in the displacement rod. NOTE: The piston retainer (43) must not obstruct the ports in th