Me and the neighbor are having a bear of a time to get a old B&S 5HP engine on a rototiller to start, I've tried multiple shots of starting fluid with no avail. We changed the original Champion RCJ8 with a NGK CS1(J19LM equivalent), no go. I pull the starter off and I noticed the flywheel was rusty and so was the coil. Should we replace the coil and clean the flywheel with a flap wheel? The carb's working fine, the plug smelled like fuel.