Sinnis JS
Real ownership data from 433 UK JS motorcycles — mileage, MOT pass rates and the faults that actually come up, taken from DVSA test records rather than opinion.
Most common JS problems
Ranked by how often each fault appears in this model's MOT history.
| Fault | Severity | Share of faults |
|---|---|---|
| Tyres | dangerous | 15.9% |
| Chain and sprockets | dangerous | 8.9% |
| Electrical | major | 5.5% |
| Lights and indicators | dangerous | 5.4% |
| Brakes | major | 4.8% |
| Other | dangerous | 4.6% |
| Suspension | dangerous | 3.3% |
| Wheels | major | 3.1% |
Advisories (wear noted but not failed) are excluded above; the most common is controls and cables.
JS mileage and reliability by year
Use this to judge whether a specific bike is high or low mileage for its age.
| YearYear | MedianMedian mileage | Mi/yrMiles/year | MOT passFirst-time pass | |
|---|---|---|---|---|
| 2017 | 7 | 2,886 mi | 934 | 73.33% |
| 2016 | 125 | 9,705 mi | 1,439 | 61.81% |
| 2015 | 217 | 9,207 mi | 1,377 | 68.63% |
| 2014 | 77 | 11,201 mi | 1,570 | 64.46% |
JS questions, answered with data
What are the most common problems with the Sinnis JS?
Across 433 UK examples, the most frequently recorded MOT faults are tyres (15.9% of all recorded faults), chain and sprockets (8.9% of all recorded faults), electrical (5.5% of all recorded faults).
What is average mileage for a Sinnis JS?
The median Sinnis JS in the UK has covered 9,537 miles, and typically rides about 1,434 miles a year. Half of all examples fall between 5,505 and 14,930 miles.
Is the Sinnis JS reliable?
66.09% of Sinnis JS MOT tests are passed first time, with an average of 0.29 faults recorded per test. This is measured from DVSA MOT records, not owner opinion.
Based on DVSA MOT test records for 433 Sinnis JS motorcycles registered in Great Britain and Northern Ireland. Contains public sector information licensed under the Open Government Licence v3.0.