EtOH100

I got a Indy 500 Classic that only gets run 2-3x/yr when the local snow is enough to allow. Went out yesterday to start for 1st time this season. Put in new fuel and new plugs(NGK iridium) w/proper gap. before starting, I just laid the plugs on top of the block to look at the spark. The one was a nice bright blue, but the other was a small dim orange color. Still started up ok, but was just wondering if I should go buy a spare "whatever". I'm not too electrically inclined, but mechanically handy. Would this be a CDI or stator problem? or due to the fact that the battery has been dead for years and I usually just pull start it manually. Any advice would be greatly appreciated.