From what I remember there are some numbers on the rockers,but they are not relevant.But there are two types of rocker arm and will only fit in one place or the other.In the ideal case,for the wear surfaces to be the same,the correct rocker should be mated with the same cam lobe.When I install the rocker shafts and the rockers,I always turn the engine over until the cam lobes for say the inlet 1 and 2 are pointing down, then I slide the shaft through both rockers at the same time...with plenty of fresh oil.I always tension the cam chain when there are no rockers fitted,rather than 15 degrees after 1 & 4 timing mark with #1 on compression.
The markings that are relevant are the cam carrier caps as they are line bored at the factory during manufacturing.
Most 4 cylinder Jap bikes do run with was it commonly termed as a wasted spark system.This is normally recognised as those with only two coils for 4 cylinders.
Any coil has a certain rise time during which energy is transferred from the primary coil,which is that energy stored in the condenser on a standard SOHC 4,into the secondary wiring via an EMF,that being induced energy.The amount of time required for the transfer to fully energise the secondary windings is the rise time.As the output of standard Honda coils is relatively weak ie.about 6000 volts or 6kv,this is why a worthwhile modification is to install uprated Dyna coils.
Cars used to have a single coil together with a distributor system so would not utilise the wasted spark system.
Some more recent Jap fours utilise the 'coil-in-the-cap' system so as to save space in the frame for a bigger airbox.This is where the primary signal,derived from the ECU,is delivered to the coil on the top of the spark plug.
I had Andrews coils fitted to my 750/823 F2 and together with NGK D8EV plugs it made it very worthwhile.
The firing sequence on the Honda fours is the same as for the majority of modern Jap fours...as in 1-2-4-3. The bike that comes to mind that does not fire in this order is the new R1 that has the 'cross-plane' crankshaft.