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Recommended Starting Procedure for ZDZ Engines
All ZDZ engines that use a rotary valve with fixed induction timing must use a unique starting
procedure as compared to their piston ported or reed valve inducted counterparts. The starting procedure
described below is most commonly referred to as the 5, 5 and 1 method. It is the preferred way to start
a ZDZ engine once the carb has been primed.
For brand new engines, a richer low speed needle setting of approx. 2-1/2 turns out is required for initial
fuel draw.
Step 1
With the Choke completely closed and the Ignition system OFF, advance the throttle to full open,
Flip the prop smartly 5 times.
Step 2
Open the Choke completely, Leave the ignition system in the OFF position, leave the throttle at full
open, and flip the prop smartly 5 more times.
Step 3
Reduce the throttle completely and advance the trim to a mid to high setting, turn the ignition system
ON, 1 smart Flip and the engine will start!