1998 Triumph Thunderbird 0.9L Petrol · R458 ABW

Electrical faults are the recurring theme in this Triumph Thunderbird's otherwise clean MOT record, with the horn and indicators causing the only recorded failure in October 2023 before a same-day retest pass. The horn had already been flagged as a minor defect back in April 2019, and it resurfaced as a major failure four years later alongside a non-functioning offside front direction indicator, suggesting persistent gremlins in the switchgear or wiring rather than isolated incidents. Beyond those items, the history is reassuringly sparse: the machine passed in April 2026 with no defects recorded, and the only other advisory on file is a front tyre worn close to the legal limit in 2021. The overall trend is stable, with five clean passes in the last six tests. At roughly 895 miles per year over 28 years, this is a lightly used machine, and the testing pattern supports that reading, with annual tests since 2019 and a gap between April 2019 and September 2020 that likely reflects the pandemic-era disruption rather than neglect. Low annual mileage on a motorcycle of this age means consumables such as tyres, brake pads and chain wear slowly, but it also means components can age through time rather than use: rubber items harden, and electrical connectors exposed to years of storage conditions can corrode at the terminals, which fits neatly with the repeated horn and indicator faults. The 2021 advisory on a front tyre worn close to the limit on a bike covering under a thousand miles a year is worth noting, as it points to age-related degradation as much as tread wear. On inspection, the priority should be the electrical system given its history. Test the horn repeatedly, check both front indicators for bright, consistent flashing, and examine the handlebar switch clusters for corrosion or stiff action, since the 2019 advisory also noted a throttle stiff to return, which points to the right-hand switchgear and cable run as an area that has needed attention before. Work the throttle through its full travel and confirm it snaps back cleanly at every handlebar position; a sticky return on a 28-year-old machine can indicate dry cables or gummed twistgrip internals and is a genuine safety item. On a test ride, listen for any hesitation or flat spots in carburation consistent with a machine that has spent long periods standing, and check the front tyre fitted after the 2021 advisory for tread depth and any cracking in the sidewalls. Confirm the brakes bite progressively without pulsing, and inspect the fork stanchions and frame for corrosion commensurate with age. If the electrical checks pass cleanly and the throttle action is smooth, the record supports a machine that has presented well at test in recent years, with the 2023 failure appearing as a rectified electrical hiccup rather than evidence of deeper mechanical deterioration.