Premium Aluminum Radiator Replacement For Yamaha YFZ450R YFZ450X 2009 2010 2011 2012 2013

Premium aluminum radiator replacement for the Yamaha YFZ450R and YFZ450X (model years 2009–2013). This radiator is designed to replace the stock unit with a high-capacity, all‑aluminum core that improves cooling efficiency and temperature stability under demanding trail, desert, or farm use. It is a radiator-only assembly; fan and related shrouds are not included, so you’ll reuse your existing fan if needed.

Built for durability and long service in harsh conditions, this aftermarket replacement focuses on real-world wear and tear: bent fins, coolant leaks at hose connections, and reduced cooling capacity after hard use. With a 2-row aluminum core, 18mm tubes, and crossflow design, it delivers superior heat rejection, tougher corrosion resistance, and a reliable flow path that keeps your engine running cooler when the throttle stays pinned. Includes a pressure cap to simplify installation and get you back on the trail or farm faster.

Comprehensive Vehicle Fitment

Fitment notes and part-number references support the Yamaha YFZ450R/X line across 2009–2013, with cross-reference listings indicating compatibility as a direct replacement for the OEM radiator 18P-1240A-00-00.

Sources: compatibility and replacement references from aftermarket radiator catalogs and OEM cross-reference data.

Product Specifications

Note: dimensions and features may vary slightly by supplier; the core is a two-row aluminum design with a crossflow configuration, and many listings indicate a cap included. Refer to the specific product page for exact measurements.

OEM & Aftermarket Cross-Reference Information

Cross-reference notes pulled from multiple aftermarket catalogs and OEM data for Yamaha YFZ450R/X radiators.

What’s Included

This listing is for the radiator assembly only; does not include the cooling fan. In the box you typically receive:

• Radiator Assembly
• Pressure Cap (included on many listings)

Related parts such as the cooling fan and mounting hardware are not included unless specifically stated.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely matched inlet/outlet locations and mounting points for a straightforward install on 2009–2013 YFZ450R/X models.
• OEM Cross-Reference: Interchangeable with OEM 18P-1240A-00-00; broad cross-reference support across aftermarket brands.
• Premium Materials: All‑aluminum core and TIG-welded tanks for enhanced durability and corrosion resistance in tough environments.
• Performance Restoration: Higher cooling capacity with a 2‑row core and crossflow design helps lower peak engine temperatures under load.
• Reliable for Trails & Farms: Built to withstand debris, rugged terrain, and repeated heat cycles common in off-road use.
• Maintenance-Friendly Design: Aerodynamic fins and robust construction simplify cleaning and reduce risk of debris-induced cooling loss.

Installation Notes:

• Drain coolant completely before removing the old radiator; inspect and replace any damaged hoses during installation.
• Check hose clamps and radiator fittings for wear; replace with new clamps to ensure a leak-free seal.
• Be careful with the fins—avoid bending or crushing them during removal and reinstallation to preserve cooling performance.
• Ensure correct orientation and alignment of mounting points; use hand-tightened bolts first, then tighten to the specified pattern to avoid warping.
• Bleed air from the cooling system after refill; run the engine with the cap off until thermostat opens and air bubbles stop.
• Use the included pressure cap where listed; if your original cap has a different pressure rating, confirm compatibility with your cooling system specifications.

Why Upgrade?

Running a worn or undersized radiator can lead to overheating, coolant loss, and accelerated engine wear, especially under hard use or hot conditions. Upgrading to this aftermarket radiator restores efficient cooling, reduces thermal cycling stress on the engine, and maintains reliable performance during long trail sessions or farm work.