Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Technically correct (loose electrical connections are always bad, right ?) , But not always when a secure, fixed, Small gap within a Transparent spark plug boot can be very useful in diagnosing engine starting or running issues. The Jin ignition modules produce such a huge excess reserve spark voltage, that can be used to instantly & visually verify you deff have good normal spark Delivered to the plug or not as other mechanical probs can exist...Tom.