2020 WK Bikes SX 125 0.1L Petrol · FY70 ECN

Front suspension integrity and fluid containment present the primary mechanical concern for this WK Bikes SX 125, punctuated by a significant failure in August 2025 where both front shock absorbers suffered serious fluid leaks alongside a contaminated front brake disc, an inoperative registration plate lamp, and incorrectly aimed headlamps. Although that failure was rectified to secure a pass later that month and the machine subsequently cleared its latest test on 2026-08-29, the most recent inspection carried forward fresh warnings regarding a light misting of oil on the offside front shock absorber and a rear tyre worn close to the legal limit. This pattern shows a recurring vulnerability in the front damping components and indicates that the roadworthiness of the motorcycle requires careful, ongoing vigilance rather than representing a completely trouble-free history. Covering a total of 5,601 miles over its six-year lifespan translates to an average annual accumulation of roughly 934 miles, marking this motorcycle as a very low-usage machine. While this limited mileage suggests the vehicle spent substantial periods parked or operating on short local journeys rather than enduring heavy commuter mileage, such a usage profile can sometimes accelerate localized degradation on exposed components due to environmental exposure and lack of continuous mechanical movement. The testing record begins in August 2024 with a clean pass, followed by the heavy failure list in late 2025 and the subsequent passes through August 2026, confirming that the low mileage has not entirely protected the machine from mechanical wear and component failure. During a static inspection and dynamic test ride, the prospective buyer must pay immediate attention to the front forks, specifically checking for any recurrence of active fluid weeping around the seals or shafts given the history of serious leaks and ongoing misting advisories. Listen closely for any excessive front-end dive under heavy braking or harsh bottoming-out over bumps, which would confirm that the damping efficiency of the shock absorbers has degraded. The braking system also warrants strict scrutiny; verify that the front disc shows no lingering signs of contamination or scoring, ensure the front brake lever operates smoothly without binding despite its previous bending history, and inspect the rear tyre's tread depth across its entire width to budget for an immediate replacement. Finally, verify all electrical auxiliary items before purchase, paying particular attention to the registration plate illumination and headlamp alignment, both of which were flagged during the 2025 failure event. Check that the wiring loom and connectors are free from corrosion or damp-induced faults that frequently plague low-mileage motorcycles left standing outdoors. By thoroughly evaluating these specific historical defect points on a test ride, the buyer can ensure that previous damping failures and electrical faults have been properly resolved rather than temporarily patched.