2001 Yamaha DT125 0.1L Petrol · Y798 DHN

The Yamaha DT125 presents a stable roadworthiness record in its most recent MOT history, with the April 2025 test at 35,164 miles passing without defects—a positive indicator of current compliance. The absence of advisories or failures in this latest inspection suggests no immediate mechanical or structural issues were present at the time. However, the August 2024 failure, also at near-identical mileage (35,163 miles), raises a red flag: the vehicle was deemed unroadworthy without any recorded defects, which implies a procedural or administrative error rather than a mechanical one. Given the sparse data, there’s no evidence of recurring faults or worsening conditions, but the inconsistency in pass/fail status without explanation demands further scrutiny. The DT125’s mileage of 35,164 over roughly 25 years—averaging just 1,407 miles annually—points to either very light use or prolonged periods of inactivity. The near-identical mileage between the 2024 and 2025 tests (a mere 1 mile difference) suggests the bike may have sat unused for nearly a year, which could accelerate issues like seized bearings, degraded seals, or battery failure. The 2022 test at 35,018 miles shows even less movement, reinforcing the likelihood of minimal recent use. Such low mileage typically reduces wear on primary components like brakes, suspension, and drivetrain, but it also means fluids may have degraded over time, and rubber seals could have dried out. For a buyer, the primary focus should be on components vulnerable to long-term neglect. Inspect the battery for corrosion or voltage levels, as a bike unused for extended periods often suffers from parasitic drain. Check the chain and sprockets for rust or stiffness, and verify the condition of the suspension bushes—these degrade even without heavy use. The brakes should be tested for binding or uneven pad wear, though the lack of MOT advisories suggests no obvious issues. Finally, examine the frame and subframe for signs of stress corrosion, particularly around welds or mounting points, given the age of the bike. The absence of recorded faults in recent tests is encouraging, but the irregular pass/fail history and minimal mileage warrant a thorough pre-purchase mechanical check.