ignition and advance engine

My first fully built model, its a single cylinder flat engine, powered by a bomb set off by a laser, it has a dual charge just to get it running, haven't developed a starter yet, due to the delay in laser setting out the bomb I have advanced the fuel timing, I was trying to create ignition timing as wheel, but I need to figure out a way to extend the signal time for the laser to allow it to full set off the charge, thanks for looking, its not much but its something! I'll make bigger and better soon as I get the new design elements of principa down!