Enduro Engineering Radiator Guards for 2016–2026 Yamaha YZ250X, 2020–2026 YZ125X

The Enduro Engineering Billet Radiator Guards (12-5102) are full-coverage, CNC-machined aluminum guards engineered to replace factory plastic louvers on Yamaha two-stroke cross-country and off-road motorcycles. On tight woods trails, rocky singletrack, and technical enduro terrain, the radiators on the Yamaha YZ250X and YZ125X are among the most vulnerable components on the machine. A simple off-camber tip-over against a boulder or a tree trunk impact can fold the radiator core backward, pinch off internal cooling passages, or snap the coolant tank necks, instantly ending a ride.

Precision-machined from solid 6061-T6 billet aluminum, the 12-5102 guards combine heavy-duty front puncture protection with rigid side-impact bracing in a single integrated structure. Unlike flimsy stamped mesh screens or multi-piece bolt-together braces, this billet cage encloses the radiator face to deflect trail debris, roost, and spearing tree branches while transferring lateral impact energy directly around the core to the chassis mounting points. The machined vent pattern maintains maximum direct airflow across the cooling fins to prevent boil-overs during low-speed, high-clutch technical climbs.

Features:

• Integrated Billet Protection: Combines rigid side-impact bracing and heavy-duty front face grille shielding into a single-piece CNC-machined 6061-T6 aluminum design.

• Trail Hazard Puncture Shielding: Deflects trail branches, sticks, and rock roost that easily pierce factory plastic louvers and puncture delicate aluminum cooling tubes.

• Side-Impact Crush Resistance: Prevents radiators from folding inward, twisting, or collapsing against the frame rails during low-speed trail drops and tree impacts.

• Optimized Woods Airflow: Machined slot pattern allows unrestricted cooling flow to prevent overheating and boiling during tight, technical singletrack riding.

• No Separate Braces Required: Standalone design replaces stock plastic louvers completely; eliminates the need for separate structural rear braces.

• Direct Bolt-On Fitment: Mounts cleanly to factory radiator points and preserves stock tank shroud lines with no frame modification required.

• Made in the USA: Designed, tested, and manufactured in the USA.

What's in the Box

• 1x Left Billet Aluminum Radiator Guard

• 1x Right Billet Aluminum Radiator Guard

• 1x Complete Metric Fastener Mounting Hardware Pack

• 1x Installation Instructions Sheet

Fitment:

• 2016–2027 – Yamaha YZ250X

• 2020–2027 – Yamaha YZ125X

• 2000–2027 – Yamaha YZ250

• 2002–2027 – Yamaha YZ125

Fitment Notes:

• Chassis Compatibility: Fits all aluminum-frame Yamaha 125cc and 250cc two-stroke models manufactured from 2005 onward.

• Aftermarket Tank Compatibility: Clears standard OEM fuel tanks and popular oversized off-road tanks (IMS, Clarke, Acerbis) configured for factory radiator shroud spacing.

• Accessory Compatibility: Standalone system. Doesnot pair with, nor require, secondary aftermarket rear radiator braces.

• Radiator Trueing Prior to Installation: Billet guards are precision-machined to match square, factory-dimensioned radiators. If your YZ250X or YZ125X has already seen trail time and sustained a tip-over, the radiators may be slightly twisted, bowed, or pushed back toward the frame. Do not attempt to force the rigid billet guards onto twisted radiators, as this cross-threads the brass tank inserts or cracks the mounting tabs. Place a straight edge against your radiator faces first; gently tweak the core back to square on the workbench before bolting the guards on.

• Hardware Thread Prep: The mounting bolts thread into aluminum housings that endure constant engine vibration from a high-revving two-stroke. Apply a small drop of medium-strength (blue) threadlocker to each bolt thread during assembly. Start every bolt by hand for 3 to 4 turns before tightening to ensure you do not cross-thread the inserts. Tighten all hardware evenly in stages so the guard pulls flat and flush against the radiator face.

• Low-Speed Singletrack Airflow & Mud Management: Two-stroke cross-country bikes like the YZ250X and YZ125X do not come equipped with auxiliary radiator cooling fans. In dense woods, tight rock sections, or deep mud, air speed across the radiators drops dramatically. To prevent wet loam, clay, or sticky sand from packing inside the guard slots and restricting airflow, spray a light, wet coat of Maxima SC1 directly onto the guard grilles prior to the ride. This creates a slick barrier that allows roost to slide off rather than baking into a solid crust.

Part Number: 12-5102