Speedo Seats & Luggage- racks Frame Chassis Suspension Forktubes Wheels Brake Fenders Gastanks Motorparts Gaskets Intake Transmission & Driveline Exhaust Electrical & Lights Handlebars, Cables & Mirrors Oil tanks Oil & Chemicals Fasteners Windshields Forward controls, Footpegs Miscellaneous ELECTRICAL - IGNITION, WIRING, STARTERS, REGULATORS & BATTERIES 15 1184 NEW PRODUCTS ADDED WEEKLY AT / MOTORCYCLESTOREHOUSE.COM EARLY OEM STYLE IGNITION COILS Black 12 volt OEM early 65-84 style replacement coils. 65-E78 B.T. with points ignition; L78-79 B.T. with OEM V-Fire I/II half electronic ignition; 65-79 XL (excl. magneto models). (Dual fire) 516815 5 Ohm. Repl. 31609-65A Electronic 508755 4 ohm. 80-84 B.T., XL. Repl. 31609-80 516815 MORRIS, MAGNETO COIL Stock Morris replacement coil for motorcycles that are equipped with a Morris, Joe Hunt or stock H-D magneto. OEM style replacement for OEM 29524-55A. 501725 Orange/brown 930462 Black 501725 ANDREWS, COILS Dual fire 30.000 plus Volts High-Performance Andrews coils for 12 Volt systems. 65-E78 B.T. with points ignition; L78-79 B.T. with OEM V-Fire I/II half electronic ignition; 65-79 XL (excl. magneto models). (Dual fire) 503900 Black, points ignition. 4.8 ohm 80-84 Shovel B.T.; 80-84 XL. With electronic ignition (Dual fire) 503910 Red, electronic ignition. 2.8 ohm 503910 ACCEL POWER PULSE COILS 30.000 volts of High Performance. In 12 volt with a 3.0 or 4.2 ohm primary resistance. 65-E78 B.T. with points ignition; L78-79 B.T. with OEM V-Fire I/II half electronic ignition; 65-79 XL (excl. magneto models). (Dual fire) Yellow Black 519295 519447 4.2 ohm 80-84 Shovel B.T.; 80-84 XL. With electronic ignition (Dual fire) Yellow Black -- 519481 3 ohm 519295 519447 OEM STYLE COILS DYNATEK, EARLY OEM STYLE IGNITION COIL High performance OEM style replacement coil. Made in the U.S.A., for stock dual fire applications. Note: It is recommended to use ignition modules & coils of the same manufacturer. Intermixing different brands may cause premature failure. 65-E78 B.T. with points ignition; L78-79 B.T. with OEM V-Fire I/II half electronic ignition; 65-79 XL (excl. magneto models). (Dual fire) 915681 12 volt, 5 ohm. (DC7-1) 80-84 Shovel B.T.; 80-84 XL. With electronic ignition (Dual fire) 915682 12 volt, 3 ohm. (DC6-1) 915681 915682 Coils and the illusive... Primary Resistance! Primary resistance determines the amount of current that will flow through a coil. Lower is a higher current, higher resistance is a lower current. Therefore a super low primary resistance is best, right? Wrong! With all ignitions, a too high primary resistance will cause a weak spark, a too low primary resistance will cause the coil and ignition to overheat and eventually fail. That is why you have to stick to the ignition system manufacturer recommendations. Ignition systems using a mechanical advance cannot accurately control coil dwell time (time required to re-charge the ignition coil). Therefore primary resistance must be relatively high to prevent overheating, usually around 4 to 6 Ohm. Typically a mechanically advanced ignition will give high spark energy at low engine speeds, and a weak spark at high RPM. Electronic ignition can control dwell time and is timed to use a coil with specific primary resistance, usually around 2.5 to 3.5 Ohm. 99-up Twin Cams and 04-up XL Sportsters use coils with around 0.5 Ohm. Therefore Evo & Twin Cam style coils cannot be mixed. With a too low primary resistance the coil will not deliver more spark energy but just dissipates more heat into the coil and output transistors, causing overheating and premature failure. Inductivity determines the energy and speed of the coil. High inductivity gives higher energy, but lower speed. Low inductivity gives lower energy, but higher speed. A powerful coil, which is also fast, is possible... the trick is low inductivity but high current. With such a coil type dwell time must be fixed and it must match the coil. That's possible with electronic ignition only. Information provided by Altmann Micro Machines. tech tip 104 OEM STYLE EARLY COILS Replacement OEM style square reproduction coils. Includes spark plug cable kit. Compatible with points ignition only. 30-47 B.T.; 30-52 45" SV; 53-54 Servi-Cars Black Chr. 516971 516973 6V. Repl. 31602-30, 1722-30A 516972 516974 12V 48-69 OHV B.T. 516975 901035 6-V. Repl. 31604-48 (48-57 OHV style) 516976 901030 12-V 901030 516972 65-99 CUSTOM COIL COVERS Custom coil covers for all 65-84 4-sp B.T. and 84-89 Softail models. 519355 Louvered, chrome. Repl. 31610-83T 519456 Louvered, black 519456 519355
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