Close-up of an S&S Cycle HI-4N Performance Ignition Module for 1970-1999 Harley-Davidson Big Twin and 1986-2003 Sportster, showing labeled mode, advance rate, and RPM limit dials with a black cable attached.

S&S HI-4N Performance Ignition Module for 1970-1999 Harley-Davidson Big Twin and 1986-2003 Sportster

SKU: 108-0187

$411.95 $370.75 Save $41.20
/
  • Low stock - 2 items left
  • Inventory on the way
  • Hassle-free 90 Day Returns
  • Free USA Shipping for Orders Over $99*
  • Free Tech Support M-F 8:30am-4:30pm EST
  • Fast Shipping—No Backorders, No Drop Shipping, No BS

S&S HI-4N Performance Ignition Module for 1984-1999 Harley-Davidson Shovelhead, Evolution, and 1986-2003 Sportster

Electronic ignition modules don't last forever, especially ones that live in the hot nose cone on Evos and Shovels. If you need a replacement, the S&S HI-4N offers adjustability OEM-pattern replacements can't match.

  • Single-fire and dual-fire function built into a single module
  • All-metal housing provides improved heat dissipation
  • Ignition advance and timing degree markings are on the metal flange
  • Sensor housings contain advanced flux concentrators with high-temperature-resistant samarium/cobalt magnets for accurate, reliable ignition triggering
  • Electronics are fully enclosed to resist vibration, moisture and dirt
  • Four rotary switches for ignition mode selection, advance rate, and rev limit
  • Not for fuel-injected models

Note:  Not legal for sale or use in California on any pollution controlled motor vehicles.

  • 1970-1999 Harley-Davidson Big Twin with Shovelhead or Evolution engine
  • 1986-2003 Harley-Davidson Sportster
  • 108-0187; replaces 2101-0345, 550-0501

This site is protected by hCaptcha and the hCaptcha Privacy Policy and Terms of Service apply.

California: ⚠️WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Install Instructions

Trending Products

Three TC Bros. Pro Series Truss Digital Gauge Pullback Risers for Harley-Davidson Softail (2018-2024) in gold, black, and silver are upright against a white background, showcasing their durable style.
Three TC Bros. Pro Series Truss Digital Gauge Pullback Risers for Harley-Davidson Softail (2018-2024) in gold, black, and silver are upright against a white background, showcasing their durable style.
TC Bros.
TC Bros. Pro Series Truss Digital Gauge Pullback Riser for Harley-Davidson Softail 2018-2024
from $549.95
Close-up of the TC Bros. Pro Series Truss Pullback Riser for Harley-Davidson, featuring exposed bolts and cables against a blurred outdoor background. Crafted from billet aluminum, this TC Bros. riser offers rugged style and durability.
Close-up of the TC Bros. Pro Series Truss Pullback Riser for Harley-Davidson, featuring exposed bolts and cables against a blurred outdoor background. Crafted from billet aluminum, this TC Bros. riser offers rugged style and durability.
TC Bros.
TC Bros. Pro Series Truss Pullback Riser for Harley-Davidson
from $499.95
Four TC Bros. Pro Series Modular Pullback Risers for Harley-Davidson, in black and silver finishes, stand upright in two rows against a white background.
Four TC Bros. Pro Series Modular Pullback Risers for Harley-Davidson, in black and silver finishes, stand upright in two rows against a white background.
TC Bros.
TC Bros. Pro Series Modular Pullback Risers for Harley-Davidson
$374.95
The TC Bros. Test Bundle Product Big Twin Hardtail Kit features a metal bicycle frame with a sloped top tube and assorted hardware—perfect for chopper builds or achieving classic TC Bros. hardtail style, all displayed on a clean white background.
The TC Bros. Test Bundle Product Big Twin Hardtail Kit features a metal bicycle frame with a sloped top tube and assorted hardware—perfect for chopper builds or achieving classic TC Bros. hardtail style, all displayed on a clean white background.
TC Bros.
TC Bros. Weld-On Hardtail Kit for 1982-2003 Harley-Davidson Sportster w/ Stock Width Tire
$429.95
The TC Bros. Mid Controls Deluxe Kit for 1991-2017 Harley-Davidson Dyna includes black metal brackets, a rod, bolts, washers, nuts, and small hardware—ideal parts for customizing your bike—displayed on a white background.
The TC Bros. Mid Controls Deluxe Kit for 1991-2017 Harley-Davidson Dyna includes black metal brackets, a rod, bolts, washers, nuts, and small hardware—ideal parts for customizing your bike—displayed on a white background.
TC Bros.
TC Bros. Mid Controls Kit for 1991-2017 Harley-Davidson Dyna (Select Your Pegs)
$374.95
Two TC Bros. 11.8" front floating brake rotors for 2006-2025 Harley-Davidson, one with a wavy edge and one with a round edge, both featuring circular cutouts and bolt holes, are displayed on a white background.
Two TC Bros. 11.8" front floating brake rotors for 2006-2025 Harley-Davidson, one with a wavy edge and one with a round edge, both featuring circular cutouts and bolt holes, are displayed on a white background.
TC Bros.
TC Bros. 11.8" Front Floating Brake Rotor for 2006-2025 Harley-Davidson
from $174.95
Two Moto Iron® 40 Spoke 21" × 2.15" Chopper Spool Wheels, one with a black rim and one with a chrome rim, are displayed side by side, each marked "21'' SPOOL.
Two Moto Iron® 40 Spoke 21" × 2.15" Chopper Spool Wheels, one with a black rim and one with a chrome rim, are displayed side by side, each marked "21'' SPOOL.
Moto Iron®
Moto Iron 40 Spoke 21" × 2.15" Chopper Spool Wheel
$274.95
The TC Bros. 12.6" Oversized Front Floating Brake Rotors for 2000-Up Harley-Davidson wheels feature black centers, ventilated silver 420 stainless steel rings (one round, one wavy edge), and are ideal upgrades by TC Bros.
The TC Bros. 11.5" Profile Front Floating Brake Rotor for 2000-2014 Harley-Davidson features a stainless steel friction surface, black center hub, and multiple mounting holes, demonstrating TC Bros.' precision engineering and durable construction.
TC Bros.
TC Bros. 11.5" Front Floating Brake Rotor for 2000-2014 Harley-Davidson
from $174.95
The TC Bros. Mid Controls Kit for 1991-2003 Harley-Davidson Sportster features metal foot pegs and a gear shift lever, perfect for upgrading your bike. Components are arranged on a white background.
The TC Bros. Mid Controls Kit for 1991-2003 Harley-Davidson Sportster features metal foot pegs and a gear shift lever, perfect for upgrading your bike. Components are arranged on a white background.
TC Bros.
TC Bros. Mid Controls Kit for 1991-2003 Harley-Davidson Sportster
$299.95
The TC Bros. Front Crash Bar for Harley-Davidson M-8 Softail w/ Mid Controls is a black metal engine guard, shown with mounting hardware—bolts, washers, spacers, and brackets—ideal for added protection on your Softail.
The TC Bros. Front Crash Bar for Harley-Davidson M-8 Softail w/ Mid Controls is a black metal engine guard, shown with mounting hardware—bolts, washers, spacers, and brackets—ideal for added protection on your Softail.
TC Bros.
TC Bros. Front Crash Bar for Harley-Davidson M-8 Softail w/ Mid Controls
$349.95
View all
View all
16 products
Back to Big Twin Ignition & Electrical