I am working on a Wico C on a John Deere H. The tractor including the mag was rebuilt about five years ago. The tractor is only used for parades and shows and runs great but cranking which is hand start has become a big problem I have decided spark is the problem so I have replaced points condenser and rotor. I have read somewhere you should have a good blue spark, I am getting a spark but it isn't blue and will not pull but about a quarter inch. Everything is clean with new wires what is going wrong what do I need to do to get a good spark I am tired of pulling the tractor to crank especially when everyone is watching at a show. Please help. Thanks