How to Inspect and Replace Wheel Bearings on a 2013 Yamaha YZ85 Dirt Bike

How to Inspect and Replace Wheel Bearings on a 2013 Yamaha YZ85

Why wheel bearings matter on a 2013 Yamaha YZ85

The 2013 Yamaha YZ85 is a youth motocross machine built for aggressive track workquick direction changes, jumps, and hard landings combine to put heavy, repeated loads into the wheels. Wheel bearings keep the wheel rotating freely and precisely, directly affecting handling stability, steering feedback, and drivetrain efficiency. A worn bearing can introduce side-to-side play, unpredictable steering, and extra drag on the wheel that saps performance on the track.

Common symptoms of failing bearings

• Side-to-side wheel play felt when you try to rock the wheel laterally
• Grinding or roughness when spinning the wheel by hand
• Clicking, knocking, or a rough noise that changes with wheel rotation speed
• Drag or resistance when the wheel should spin freely
• Uneven tire wear, vague steering, or instability on landings and corner entries

Inspection basics what to check and how

Do inspections with the bike securely supported on a stand so both wheels can spin freely. The checks below are practical for riders with basic to intermediate mechanical ability.

• Grasp the wheel at opposite sides and attempt lateral movement. Any perceptible side-to-side play usually indicates worn bearings or broken hub spacers.
• Spin the wheel by hand and listen/feel for grinding, roughness, or clicks. Compare feel to the unused wheel if uncertain.
• Remove axle and inspect wheel seals for tears, missing beads, or excessive grease contamination. Damaged seals let water & dirt incommon after pressure washing or mud riding.
• Look inside the hub for rust, pitted grease, or packed mud. Water crossings and pressure washer spray directed at seals accelerate bearing wear.
• Check axle and spacer contact surfaces for scoring that can cause eccentric loading on bearings.

Removing the wheel on a YZ85

Work on a clean, level surface with the bike stable on a stand. Standard steps:

• Loosen axle pinch bolts or axle nut while the wheel is on the ground, then lift the bike onto the stand.
• Remove axle, noting the orientation and order of spacers and washerstake photos if needed for reassembly.
• Slide the wheel free of the forks or swingarm, taking care not to damage brake rotors or chain on the rear wheel.

Removing bearings from the hub

Once the wheel is out, remove seals or dust covers to expose the bearing outer race. Typical bearing removal steps:

• Use a bearing driver or a suitably sized socket that contacts only the outer race to drive the bearing out from the opposite side. Support the hub to avoid bending.
• If a press isn't available, use a punch and hammer carefullywork evenly and keep the driver square to the hub bore.
• Extract the inner race and roller assembly as a unit. Clean away old grease, corrosion, and any trapped grit from the hub bore.

Inspecting the hub and preparing for new bearings

After removal, inspect the hub bore for nicks, corrosion, or an out-of-round condition. Light surface rust can be cleaned with a Scotch-Brite pad and solvent; deep scoring may require replacement of the wheel. Ensure the hub bore is dry and clean before installing new bearings.

Installing new sealed bearings

Most YZ85 wheel bearings are sealed cartridge bearings pre-packed with grease. Follow these principles when installing replacements:

• Use the correct replacement bearings sized for the 2013 YZ85 hub. Install them evenlypressure on the outer race when pressing into the hub is preferred to avoid press-fitting force through the inner race.
• Tools: a bearing driver set, bench press, or sockets that match the bearing outer race diameter. A rubber mallet and drift can work for light taps if done squarely and carefully.
• Drive the bearing straight into the hub, applying even force until the bearing seats fully against the hub shoulder.
• After both bearings are installed, press new seals into placeuse even pressure to avoid distorting the seal lip.

Sealed-bearing guidance

Sealed bearings on the YZ85 are factory-lubed and not serviceable. If a bearing feels rough, loose, or contaminated during inspection, replace it rather than trying to lubricate or flush it. Never attempt to open a sealed cartridge bearing to add grease.

Greasing surrounding components

While the bearing itself stays sealed, apply a light coat of grease to:

• The axle shaft where it contacts spacers and bearings
• Axle spacers to prevent corrosion and ensure smooth reassembly
• The sealing lip of the wheel seals to help them seat and keep contaminants out

Do not over-grease; excess grease can migrate into the seal area and attract dirt.

Front vs rear wheel considerations

Front bearings on the YZ85 primarily handle steering and braking loads, while the rear bearings endure higher stresses from drivetrain torque, launches, and landings. Because the rear sees heavier impacts and torque, it's common for rear bearings to fail earlierinspect both wheels at the same time and replace bearings in matched pairs when practical.

Reassembly and final checks

• Reinstall spacers, brake rotor, and axle in the correct order and orientation.
• Tighten axle fasteners to a secure fit without preloading bearingsaxle torque should clamp the wheel to the forks or swingarm but allow free rotation when the wheel is lifted and spun.
• Spin the wheel and observe for smooth, quiet rotation. Check for lateral play once the axle is torqued.
• Take a short test ride and listen for unusual noisesre-check axle torque and wheel play after the first few rides.

Preventive maintenance to extend bearing life

• Avoid directing a pressure washer at sealsspray from an angle and keep distance
• Wash mud out of hubs and seals after muddy rides; allow components to dry before storage
• Check wheel play periodically and inspect seals for tears or missing beads
• Replace seals when you replace bearings to ensure a fresh barrier against contamination

Tools and supplies checklist

• Bearing driver set or sockets sized to bearing outer race
• Bench press or mallet and drift for careful driving
• New sealed bearings and replacement wheel seals
• Grease for axle, spacers, and seal lips – small quantity
• Shop rags, solvent, and a clean workspace

Replacing wheel bearings on a 2013 Yamaha YZ85 is a straightforward job when you work methodically: inspect for play and roughness, remove the wheel and press out the old bearings, clean the hub, and install new sealed bearings with even pressure. Regular checks and mindful cleaning after wet or muddy rides will help keep your YZ85 tracking true and ready for the next motos.

Related Shopping Categories

Shop Wheel Bearings for a 2013 YAMAHA YZ85 Dirt Bike.

Shop Wheel Spacers for a 2013 YAMAHA YZ85 Dirt Bike.

Shop Bearings for a 2013 YAMAHA YZ85 Dirt Bike.

Shop Bearing Tools for a 2013 YAMAHA YZ85 Dirt Bike.

Shop Wheels for a 2013 YAMAHA YZ85 Dirt Bike.

Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.