1985 Yamaha RD500 0.5L Petrol · B650 HNT

The latest MOT test on 17 November 2023 resulted in a pass, and the overall maintenance trend appears stable given the clean records from previous years. However, the introduction of an advisory regarding front brake binding in the most recent test suggests the onset of component degradation. While the vehicle has consistently passed its inspections, this new advisory indicates that the braking system is beginning to show signs of wear or seizure that were not present in earlier tests. The recorded mileage of 3,371 miles over approximately 41 years is exceptionally low, averaging only 82 miles per year. While this suggests minimal wear on the internal engine components and drivetrain, such a low usage rate is often more concerning than high mileage for a vehicle of this vintage. Long periods of standing typically lead to the stagnation of fluids and the deterioration of rubber seals and hoses, which can cause mechanical failures that are unrelated to actual wear and tear. The advisory for front brake binding is a critical point for inspection. This symptom usually points to a sticking caliper piston or seized slider pins, often caused by corrosion or perished seals during periods of inactivity. During a test drive, the buyer should ensure the front wheel spins freely when the lever is released and check for excessive heat radiating from the brake discs after a short ride. A lack of smooth deceleration or a feeling of the brakes dragging would confirm that the caliper requires a full strip, clean, and rebuild to restore safe operation. Beyond the brakes, the extreme age and low mileage necessitate a thorough physical audit. The tyres must be inspected for sidewall cracking and perishing, as rubber hardens over time and loses grip regardless of remaining tread depth. The buyer should verify the health of the 12V battery and treat all fluids as degraded due to calendar-based breakdown, regardless of the mileage. Special attention should be paid to the fuel system for gumming and the interior of the fuel tank for corrosion, alongside a check of the suspension bushes and coil springs for signs of drying or cracking.