Good improvement over standard parts and output increased to 400 Watts. This is our benchmark system. *********** Replaces rotor, stator windings, diode board, Voltage regulator (variable), alternator brushes , All required cables & includes a comprehensive installation and maintenance booklet. ************ Gives better output at low revs. ********** All parts carry a one year guarantee *** please note this is not recommended for use with Lithium or Dry Cell batteries *****