RDR High Output Performance Ignition Coil for 50cc and 90cc 2-stroke Minarelli based engines. ***Please note: The coil wire is left unattached to the spark plug boot to allow for cutting of the coil wire for custom fitment. The boot screws on to the coil wire.*** Please see our Warranty & Returns Policy. Overall Length: 21 inches Bolt Hole Spacing: 57mm Increases Spark by 5-15%!