2017 Triumph Bonneville 0.9L Petrol · BK17 GYC

The Triumph Bonneville presents a stable and improving maintenance trend, culminating in a clean pass on 30 May 2025 at 15,224 miles with zero defects recorded. That result is significant because it follows two consecutive tests where the tester flagged an exhaust noise defect under item 8.1.1 (a), first on 14 February 2020 at 13,409 miles and again on 18 May 2024 at 15,192 miles. The fact that the most recent test cleared without any advisory or failure suggests the exhaust issue has been addressed, likely through replacement or repair of a silencer or associated fitting. No other mechanical or structural defects appear anywhere in the record, which is a strong indicator of consistent upkeep across the vehicle's life. The mileage profile tells a clear story of very low usage. Across nine years the bike has covered just 15,224 miles, averaging roughly 1,692 miles per year. The annual increments are modest and fairly steady, with 141 miles added between the 2024 and 2025 tests and 141 miles between the 2022 and 2023 tests. There are no sudden jumps or suspicious gaps that would suggest odometer tampering or prolonged periods of neglect. The 2021 test is absent, which is not unusual for a low-use machine that may have been stored or kept off the road during that period, but the surrounding data points remain consistent and plausible. Despite the clean recent result, a buyer should still inspect the exhaust system carefully given its recurring presence in the record. Even though the May 2025 test passed, the repeated noise advisory across two earlier tests points to a component that has been a persistent weak spot. Check the full exhaust for corrosion, hairline cracks at welds, and the condition of mounting rubbers and flanges, particularly if the bike has spent time standing unused. The low mileage means rubber components such as fork seals, suspension bushes, and tyre sidewalls may have aged through time rather than wear, so a close visual inspection of those parts is warranted regardless of how few miles are on the clock. The braking system and drivetrain deserve attention too. Low annual mileage can lead to caliper seizure, sticking pistons, and uneven disc wear from short trips and standing periods rather than high-speed use. Spin each wheel and check for binding, inspect the disc surfaces for corrosion pitting, and verify that the chain and sprockets show no signs of neglect despite the low recorded distance. The clean MOT record is encouraging, but a hands-on inspection remains essential to confirm that this Bonneville has been genuinely well maintained rather than simply underused.