| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 317 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 87 |
| Drive chain excessively loose |6.2.1d| | 71 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 46 |
| Registration plate issues | 40 |
| Horn not working |1.7.3a| | 34 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 31 |
| Drive chain worn to excess |6.2.1e| | 29 |
| Registration plate lamp issues | 28 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 28 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 27 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 23 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 21 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 19 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 19 |
| Throttle operating incorrectly |6.2.1f| | 17 |
| Rear Drive chain excessively loose |6.2.1d| | 16 |
| Drive chain excessively tight |6.2.1d| | 14 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 12 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 12 |
| Rear reflector on motorcycle missing |1.4.1| | 11 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 11 |
| Exhaust excessively deteriorated |7.1.1a| | 10 |
| Front Brake excessively binding (1.2.1 (f)) | 9 |
| Rear Drive chain worn to excess |6.2.1e| | 9 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 9 |
| Handlebar deformed |2.1.1b| | 9 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 9 |
| Offside Front Direction indicator not working |1.5.1c| | 8 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Nearside Front Direction indicator not working |1.5.1c| | 8 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 7 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Offside Rear Footrest missing |6.2.1a| | 7 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 7 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 7 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 7 |
| Offside Front Footrest insecure |6.2.1a| | 7 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 7 |
| Headlamp aim beam image kick up to the offside |1.6| | 7 |
| Nearside Front Direction indicators not working |1.5.1c| | 6 |
| Nearside Rear Direction indicators not working |1.5.1c| | 6 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 6 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 6 |
| Centre Exhaust is leaking and excessively noisey |7.1.1b| | 6 |
| Offside Front Direction indicator insecure |1.5.3b| | 6 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Steering headbearing has excessive free play |2.2.2| | 5 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 5 |
| Offside Front Direction indicators not working |1.5.1c| | 5 |
| Exhaust noise is clearly in excess of that emitted by a similar motor bicycle fitted with a standard silencer in average condition |7.1.2| | 5 |
| Horn not working (7.7 (a) (ii)) | 5 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 5 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 5 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 5 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 5 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 5 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 5 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 5 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Rear Stop lamp damaged and function impaired |1.3.3a| | 4 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Nearside Rear Direction indicator not working |1.5.1c| | 4 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 4 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 4 |
| Offside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Offside Rear Direction indicator not working |1.5.1c| | 4 |
| Nearside Front Footrest insecure |6.2.1a| | 4 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 4 |