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
Does this replace my whole bike harness?
No. This kit manages the engine only. You’ll still need a separate chassis harness for lighting, switches, horn, indicators, and gauge power.
Will it work with my throttle body?
It’s engineered for the OEM M8 throttle‑by‑wire throttle body #27300122 (or an equivalent) on engines using a crank position sensor.
Who supports the ECM tuning?
ThunderMax/ThunderHeart provides tuning support for the included ECM, the same as their other ECM kits.
Is cruise control available?
No. This system does not provide cruise control functionality.
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.