N‑EFI‑02 — Complete Stand‑Alone M8 EFI Engine Management System

Build cleaner, faster, and smarter with the NAMZ N‑EFI‑02 stand‑alone engine management system for Milwaukee‑Eight (M8) engines. This package delivers a purpose‑built, plug‑n‑play EFI harness, proprietary twist‑grip sensor, and a ThunderMax ECM to run your M8 with throttle‑by‑wire without relying on the factory BCM. Ideal for custom frames, FXR conversions, and race‑only applications where a compact, dedicated engine control solution is required. 

• Stand‑alone engine management for M8 platforms.
• Purpose built for custom applications and race use. 
• Plug‑n‑play EFI harness simplifies install and reduces wiring complexity.
• Proprietary NAMZ twist‑grip functions just like OEM throttle‑by‑wire.
• ThunderMax ECM included for tuning. 
• Made in the USA.

What’s Included

• Engine management harness.
• Proprietary twist‑grip sensor.
• ThunderMax ECM (tuning supported by ThunderMax/ThunderHeart).

What This System Does

• Provides a complete stand‑alone EFI engine management solution with throttle‑by‑wire for M8 engines.
• Operates independently of the BCM for custom builds.

What This System Will NOT Do

• It is engine management only. lighting, switches, gauges, etc. require a separate harness/controller(s). 
• No cruise control functionality is provided.
• Not legal for sale or use in California on pollution‑controlled vehicles (race use intended).

Requirements

• OEM or equivalent M8 throttle body #27300122 (throttle‑by‑wire) and crank position sensor.
• Fuel tank with a Big Twin or XL fuel pump.
• Aftermarket speedometer/fuel readout compatible with ’05–’10 Softail, ’05–’11 Dyna, or ’05–’13 Touring/XL configurations.
• OEM‑style ignition coil (HD# 31600017) and speed sensor (HD# 74402‑05B).
• Simple hookups: +12V power, ground, fuel pump, kill switch (and where applicable, fuel sending & serial data).

Fitment

• Designed for 2017–2022 Harley‑Davidson M8 engines in custom applications (Softail, Touring, Trike, etc.).
• See model lists on reseller product pages for examples of supported years/models.

Installation & Tuning Notes

Choose a secure ECM mounting location, then route the harness to the throttle body and sensors. O₂ sensors connect directly to the ThunderMax ECM. For ECM tuning, contact ThunderMax/ThunderHeart support as you would for standard ThunderMax kits.

FAQ

Builder Notes

For FXR and other custom chassis, pair this EFI system with a well‑planned fuel system (pump, regulator, return/vent plumbing) and a compatible speedo/fuel readout. Confirm throttle body clearance and plan harness routing before finalizing mounts to minimize rework.

Keywords: NAMZ N‑EFI‑02, M8 stand‑alone EFI, ThunderMax ECM, Milwaukee‑Eight engine management, plug‑n‑play EFI harness, throttle‑by‑wire, FXR M8 swap EFI.