Mercury - Quicksilver 8M0219430 Ignition Coil TwoStroke 20hp Series Marine-Grade Ignition Module 8M0219430. Overview. Anyone who runs a small TwoStroke knows how much character these engines have - the punchy throttle response, the lightweight feel, the way they spring to life when everything's firing just right. But when the ignition coil starts to weaken, that personality turns into hesitation, rough idle and hard starting. The Quicksilver Ignition Coil 8M0219430 restores that sharp spark your