Obviously the circuit will work since it comes from a working commercial product. But there are a few things to be considered that are not spelled out. There are 3 series-connected capacitors involved but only the 22 pF is specified. There is the capacitive pickup which could be just some wire or foil wrapped around the high voltage ignition cable where the total surface area covered determines the value of the pickup capacitor. Haul out your physics text if you need to calculate the actual value of a tubular capacitor from its dimensions. Then there is the board capacitor formed by the copper foil on each side of the circuit board. Again, if you know the dimensions of the foil then you can calculate the value of that capacitor. Failing that, some experimentation will be necessary.
Just realize that you are trying to tap off a portion of what is probably a 20 kilovolt fast rise time pulse and feed it into a transistor without destroying the base junction. Too much or too little capacitance will be troublesome. In the motorcycle, is the pulse positive or negative voltage? This circuit assumes a positive pulse.
FYI, the DIY "inductive" pickup above is actually a capacitive pickup.