Overview
HFP-394 is a high-pressure OEM replacement in-tank fuel pump core engineered to restore factory-specified line pressure and volumetric delivery to modern Honda CRF motocross race bikes. Serving as a direct functional internal replacement component for Honda factory part numbers 16700-MKE-AF3 and 16700-MKE-AF1, this precision-built pump motor slides directly inside your factory plastic module hanger structure. It features direct cataloging compliance for high-performance four-stroke platforms spanning the 2021 through 2026 model years—including the lightweight, high-revving CRF250R and the premier open-class CRF450R.
Modern motocross fuel systems store the pump motor inside a compact, multi-stage plastic hanger bucket nested deep inside the fuel cell base. Dirt bike fuel systems operate under punishing track environments, dealing with relentless landing impacts, washboard terrain vibrations, and continuous trail dust. When a bike sits during the off-season, stale pump gas degrades into a sticky, dense varnish that coats the motor's internal copper windings and armature. Over time, this chemical build-up overworks the motor or binds the internal blades completely. On the starting gate or out on the track, a weak pump motor triggers severe engine sputtering at high RPMs, hard starting, an off-idle lean flat spot, or an absolute engine flame-out right on a jump face.
HFP-394 completely eliminates these operational hazards by swapping out the underlying mechanical heart of the fuel system. This drop-in unit features an advanced, precision-balanced internal turbine runner configuration that satisfies high-pressure direct-injection criteria flawlessly. To prevent pressure drops or early armature shorts, the internal check valves and tracking paths utilize premium high-performance synthetic rubber compounds. This advanced elastomer formula provides complete defense against structural swelling, drying, or cracking when continuously submerged in aggressive, modern pump gas and high-octane racing blends (E10/E85 compatible).
Features & Benefits:
- Targeted Core Restoration: Replaces only the worn or seized internal pump motor, rescuing riders from the major expense of purchasing an entirely new complete modular hanger structure from the dealer.
- Instant Pressure Security: Restores clean, linear power curves across your engine's entire operational spread, curing common mid-range hesitation and full-throttle sputtering caused by fuel starvation.
- High-Performance Synthetic Rubber: Internal sealing elements and check-valve components are molded from premium industrial-grade FKM and elastomers to resist modern fuel chemical degradation.
- Advanced Carbon Commutator: Built with heavy-duty tracking brushes that stay highly durable against the dry, non-lubricating profile of racing fuels.
- Quiet Turbine Architecture: Employs a precision-balanced internal turbine runner mechanism that lowers noise resonance and minimizes thermal heat-soak inside the plastic tank cavity.
- Drop-In Basket Alignment: Meticulously dimensioned to slide straight into your original factory Honda internal plastic hanger structure, fully preserving the use of your stock level sending unit and float hardware.
THE IDEAL REPLACEMENT FOR OEM #: 16700-MKE-AF3, 16700-MKE-AF1
Package Includes: Fuel Pump
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
