KIT USES PETRONIX IGNITION-PROVEN TECHNOLOGY. DELIVERS TWICE THE VOLTAGE TO SPARK PLUGS, INCREASES FUEL ECONOMY,AND SPARK PLUG LIFE. NO MOVING PARTS TO WEAR OUT.STABLE TIMMING NO NEED FOR ANY ADJUSTMENTS. KIT COMES WITH DETAILED WRITTEN INSTRUCTIONS AND PHOTOS AVAILABLE AT WWW.GMCIDIOTSGUIDE.COM/JOOMLA/GMC-PRODUCTS.SAME KIT FOR 4K AND 6K ONAN. 30 MONTH LIMITED WARRANTEE.GM28-BOIGNKIT CAUTION STANDARD PETRONIX UNIT WILL NOT WORK THIS UNIT HAS BEEN HIGHLY MODIFIED.