b. Remove ([fig. 50]). Before the timer shaft and base assembly can be removed, the circuit breaker timer head assembly must be removed. NOTE: If the timer head only, or timer wire, is to be replaced, it is not necessary to remove timer shaft and base assembly, and thus throw engine ignition out of time.
(1) Remove timer head cover.
(2) Unlatch cover retainer ends from holes in the timer head and remove.
(3) Disconnect spark control wire at timer lever.
(4) Lift the timer head assembly off base. The head seating tension (ground) spring (underneath shaft base) is also free, and can now be removed. NOTE: It is not necessary to disconnect timer to coil wire from timer head terminal post, unless head or wire is being replaced.
(5) Remove the two timer base mounting screws and lock washers. It will be noted that one screw grounds the timer to coil wire shielding.
(6) Timer shaft and base assembly can now be lifted out of engine gear case cover. Take care not to damage or misplace base gasket.
c. Install Timer Shaft and Base Assembly and Timing Ignition ([fig. 51]). This calls for retiming engine ignition as follows: (NOTE: Circuit breaker cam turns in clockwise direction):
(1) Unscrew and raise front cylinder inlet valve spring cover, using tappet wrench (41–W–3617).