Electronic Ignition Module 70-03 Harley-Davidson Big Twin Sportster Ultima 53-644 Single-Fire 53644

This programmable single-fire electronic ignition module is designed to control ignition timing on compatible carburettor-fed Harley-Davidson Big Twin and Sportster models. It provides electronic ignition control for single-fire applications and supports programmable advance curve adjustment when used with the appropriate optional data link cable and software.

Features

• Programmable ignition control for compatible Harley-Davidson applications
• Single-fire ignition operation
• Adjustable advance curves with optional data link cable
• Adjustable retard timing
• Intelligent overvoltage and overcurrent protection
• Short-circuit protection
• Heat-resistant electronic components to help reduce heat-related failures
• Mode switches positioned for easier setup on cam-cover and plug-in applications

Specifications

• Part number: 53-644
• Ignition type: electronic ignition module
• Configuration: programmable single-fire
• Compatible with engines up to 140 cubic inches
• Supports single-fire or dual-fire operation when used with suitable coils
• Recommended dual-fire single-plug coil resistance: 2.5–3.5 ohms
• Adjustable engine over-rev protection range: 6,000–7,500 rpm
• Eight selectable advance curves

Cross-Reference OEM Part Numbers

• Ultima 53-644
• 53644

Vehicle Fitments

• Carburettor-fed Big Twin Harley-Davidson models from 1970-1999
• Sportster models from 1971-2003, except 1200S Sport