1991 Honda NX650 0.6L Petrol · H595 GLX

A defining feature of this 1991 Honda NX650 is a recurring exhaust noise advisory logged at the two most recent MOT tests, first noted in May 2024 and repeated at the June 2026 pass. While the vehicle has never failed an MOT and the 2022 test was completely clean, the same defect appearing on two consecutive examinations suggests a progressive condition rather than an isolated occurrence. Exhaust noise advisories under Section 8.1.1 (a) typically point to deteriorating silencer packing, corrosion perforations in the canister, loose mounting brackets, or failing joint seals that allow exhaust gases to escape before reaching the rear silencer. Given the thirty-five-year age of the original system components, this is a clear signal that the exhaust assembly will require imminent attention, likely full replacement rather than a localised repair. With only 954 miles recorded over a thirty-five-year lifespan, the NX650 has accumulated roughly 27 miles per year, placing it firmly in cherished or stored-bike territory rather than regular-use machinery. The MOT record shows testing in 2022, 2024, and 2026, indicating the vehicle has been presented for roadworthiness checks at roughly two-year intervals, consistent with either SORN status for extended periods followed by brief road use, or a pattern of minimal seasonal riding. Mechanically, this usage profile carries well-known implications: despite low odometer wear, prolonged standing allows fuel system components to degrade, brake calipers to seize or bind through piston corrosion, suspension linkages and wheel bearings to develop surface pitting, hydraulic seals to harden and leak, and the drive chain and sprockets to suffer from rust jacking and stiff links. The recorded mileage offers little reassurance on its own, as the true mechanical wear is more closely related to time and storage conditions than to distance travelled. For a prospective buyer, the immediate priority is a thorough assessment of the silencer and full exhaust system, listening for rattles on the overrun, checking for visible blueing around joints, and inspecting mounting rubbers for perishing. On a test ride, particular attention should be paid to the brakes, as calipers that have sat idle can produce uneven binding or a dragging sensation; the rear drum should be checked for free operation and the front disc for any judder through the lever under firm application. The suspension should be evaluated over uneven surfaces for any knocking from seized linkages, top-yoke bearings, or rear shock mountings, all of which deteriorate through lack of movement. Engine start-up behaviour is also critical, as carburettors on a stored NX650 commonly suffer from blocked jets, perished vacuum lines, and fuel petcock diaphragm failure, leading to flooding, hesitation, or a prolonged warm-up period. A compression test and inspection for oil seepage around the valve cover gasket and lower engine casings would further confirm internal condition, while the chain and sprockets warrant close scrutiny for rust and stiff links that could compromise safe operation.