Mechanical Advance Electronic Ignition For Big Twin 1936-1969 & Sportster

Weight: 1.73 Designed for dual fire applications with single or dual spark plug heads Designed with built-in mechanical spark advance unit. Using Mallory's time tested breakerless ignition circuit, combined with modern surface mount Thermal-Clad ® construction, the kit can drive any ignition coil or combination of ignition coils with a total primary resistance of at least 2.0 OHMs We recommend ignition coils with 2.3-3.0 OHMs for racing applications and ignition coils with 3.0-4.0 OHMs for street and highway use Incorporates an infrared light beam and an optical interrupter to trigger the ignition. This type of trigger is extremely accurate and much more effective than hall effect (magnetic) type ignitions Use with spiral core or carbon core suppression type spark plug wires Billet alluminum ignition can easily be installed without removing the front cylinder head Installation insructions are included Mallory Ignition Machine Finish Ignition Fits Big Twin 1936-1969 Note: Use 17535 hold down clamp for 1936-1965 models By: HOLLEY PERFORMANCE PRODUCTS,INC.