To simplify the engine and minimize charges, the V-twin ignition was built to run with just one set of details and no distributor. This is referred to as a twin fireplace ignition system, triggering the two spark plugs to fireplace no matter which cylinder was on its compression stroke, https://harleydavidson45555.anchor-blog.com/11343323/5-tips-about-harley-davidson-you-can-use-today