Yamaha YZF-R125 Chassis & Handling Index


⚠️ Safety Warning: Chassis and suspension components are vital for your bike's stability. Incorrectly torqued axle bolts, worn bearings, or leaking fork seals can lead to a loss of control. Always use a torque wrench and refer to a workshop manual when performing chassis maintenance.



1. Suspension & Forks

Maintaining the front and rear suspension ensures the bike absorbs bumps without compromising your line in a corner.

  • Front Fork Seal Replacement: Essential if you notice oil leaking down the fork legs onto your brakes.

  • Rear Shock Adjustment: How to adjust the preload on the linked monoshock to suit your weight.

  • Shop Suspension: Front Fork Seals & Rear Shocks for R125 on eBay UK

2. Braking System

The R125 uses a 292mm front disc. Keeping the hydraulics and pads in top shape is your number one safety priority.

  • Brake Pad Change: Step-by-step for both front and rear Brembo-style calipers.

  • Bleeding the Brakes: Removing air bubbles to fix a "spongy" lever feel.

  • Disc Inspection: Checking for warping or thinning below the minimum service limit.

  • Shop Brakes: Brake Pads and Discs for Yamaha R125 on eBay UK

3. Wheels, Tyres & Bearings

  • Wheel Bearing Replacement: How to diagnose "play" in the wheels and press in new bearings.

  • Chain & Sprocket Alignment: Crucial for power delivery and preventing premature wear on the Deltabox swingarm.

  • Tyre Guide: Recommendations for the best rubber (like Pirelli Sport Demons) for the 17-inch rims.

  • Shop Drivetrain: Chain and Sprocket Kits for R125 on eBay UK

4. Bodywork & Frame

  • Fairing Removal: The correct sequence to remove panels without snapping the plastic tabs.

  • Tail Tidy Installation: One of the most common "Chassis" visual mods.

  • Workshop Manuals: Yamaha YZF-R125 Service Manuals on eBay UK


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