2005 Yamaha YZF R6 04 0.6L Petrol · OU55 DSE

A chronic, recurring noisy exhaust advisory has been logged at every single MOT test on file for this 2005 Yamaha YZF-R6 from 2018 onwards, persisting through six consecutive examinations including the most recent pass on 14 May 2026, which suggests an underlying exhaust system issue such as a corroded header joint, perished gasket, or loose mounting that has never been fully resolved. The 2025 test also produced a stop lamp failure alongside worn front and rear tyre advisories and the first recorded suspension concern, a worn rear lower arm pin, bush or joint, marking 2025 as the most defect-laden year in the history. The 2026 pass shows no suspension or tyre advisories, so the recent trajectory is broadly improving on those fronts, but the persistent exhaust noise indicates a long-standing issue that warrants direct physical inspection rather than reliance on the test record alone. With 7,651 miles recorded against a 21-year machine, annual mileage works out at roughly 364 miles per year, which is exceptionally low for any motorcycle and points strongly to extended standing periods interspersed with short, infrequent runs rather than regular riding. Gaps in the testing record, such as the absence of an MOT between 2019 and 2022, are consistent with a bike either being kept off the road under SORN or simply not being presented for testing during those windows, and such low usage typically accelerates rubber degradation, fuel system varnish, brake caliper binding, and standing 12V battery deterioration. The fact that the odometer has barely advanced across two decades of testing indicates that mechanical wear from high mileage is unlikely to be the dominant concern here, with age-related deterioration of seals, hoses, electrical components, and corrosion of fasteners being far more relevant. For a prospective buyer, the most concrete priorities are to physically examine the system for the source of the persistent exhaust noise, listening for blowing sounds at the header pipe, collector box, and silencer mounting with the engine warm, and checking for blue or black soot around joints that would point to an active leak. The 2025 advisory regarding the suspension linkage bush or joint pin means the rear lower suspension arm should be inspected for free play, with the bike on a paddock stand so the wheel can be manually flexed to feel for knocking or clonking over uneven ground, as the advisory noted it was not yet at the excessive movement threshold but represents an early-stage wear point that will progress. Tyres fitted since the 2025 advisories should be checked for date code and tread depth, and a close inspection of the front stop lamp wiring and switch should confirm the failure has been properly remedied rather than simply bypassed. Given the very low annual mileage, particular attention should be paid to brake caliper sliding pins and pistons, which seize rapidly on stationary bikes, so each caliper should be compressed and released to confirm smooth movement without binding. The chain and sprockets should be examined for rust pitting and stiff links indicative of infrequent lubrication, and the fuel system should be checked for stale petrol residue in the float bowl and carburettor if fitted. Electrical inspection should focus on connector corrosion, particularly in the headlamp and instrument clusters, and a battery load test is advisable to confirm cranking performance, as a 12V battery left discharged for extended periods will not recover reliably. A short test ride should focus on smooth throttle response, absence of steering head bearing notchiness through full lock, and confirmation that the rear suspension articulates freely without harshness over bumps, which together will indicate whether the extended low usage has caused latent issues beyond what the MOT history can reveal.