For the people how don't like to wind the coil.
All you need to modify - 1 (high power) transistor (BUV46) or N-FET (2SK2039) and a small ignitioncoil from a bike (6Volt).
Connect the output from the timerboard to the base/gate, the collector to the - from the coil, the emittor to ground.
Connect the + from the coil to the + from the battery and you are ready to spark.