2015 Sinnis JS 0.1L Petrol · DU65 WVB

The 2015 Sinnis JS holds a valid MOT pass certificate dated 26 September 2025, issued at 1,956 miles, but the maintenance trend is not reassuring. The pass sits directly after a failure on 20 August 2025 at 1,951 miles for a non-functioning horn and an excessively tight drive chain. Both issues were rectified between August and September, yet the same chain was flagged again in the September test as slightly tight under advisory. That chain has been a recurring concern across four separate tests since 2018, appearing as loose in November 2018, slightly tight in October 2020, excessively tight in August 2025, and slightly tight again in September 2025. A chain that repeatedly moves out of tolerance suggests either inconsistent adjustment, a worn front or rear sprocket, or a stretched chain that has not been replaced despite years of attention. The rear valve stem advisory from the most recent test adds a minor but unresolved consumable concern. Mileage accumulation is unusually low for an 11-year-old machine. The bike stood at 1,829 miles in October 2020 and reached just 1,956 miles by September 2025, adding only 127 miles over nearly five years. Before that, the recorded jump from 1,829 miles in October 2020 back to 12,437 miles in November 2018 is clearly a data anomaly or a reversed entry, but even accepting the 2018 figure at face value, annual use has averaged well under 200 miles in recent years. Such low annual mileage means the chain, sprockets, and tyres may suffer more from age-related deterioration, drying, and corrosion than from wear alone. Long periods standing can also allow fuel to stagnate, seals to dry, and bearings to lose lubrication. A buyer should inspect the drive chain and both sprockets carefully. The repeated advisories across eight years point to a system that has never been properly sorted, likely running a stretched chain on worn sprockets that accelerate each other's deterioration. Check for stiff links, hook-shaped sprocket teeth, and uneven adjustment across the swingarm marks. Examine the rear tyre for perishing and cracking consistent with age rather than mileage, and confirm the valve stem noted in September 2025 has been replaced rather than patched. The horn failure and repair between August and September 2025 is minor but worth verifying under actual operating conditions, as intermittent electrical faults on low-use bikes often trace to corroded connectors or a failing switch. Given the bike's extended periods of inactivity, a thorough check of fuel system condition, brake fluid moisture content, and bearing play in the wheels and headstock is advisable before any purchase decision.