| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 112 |
| Drive chain excessively loose |6.2.1d| | 47 |
| Horn not working |1.7.3a| | 37 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 37 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 35 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 31 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 29 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 29 |
| Steering headbearing has excessive free play |2.2.2| | 26 |
| Registration plate issues | 23 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 22 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 21 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 20 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 19 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 17 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 16 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 16 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 15 |
| Rear Brake disc|s| has excessive run out |3.2.A1m| | 15 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 15 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 14 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 14 |
| Drive chain excessively tight |6.2.1d| | 13 |
| Throttle operating incorrectly |6.2.1f| | 12 |
| Drive chain worn to excess |6.2.1e| | 12 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 12 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 12 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Front Steering headbearing has excessive free play |2.2.2| | 9 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 8 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 7 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 7 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 7 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 7 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 6 |
| Front wheel bearings have excessive free play |2.3.5b| | 6 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 6 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 6 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 6 |
| Rear Drive chain excessively loose |6.2.1d| | 6 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 5 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Nearside Rear Direction indicator not working |1.5.1c| | 5 |
| Nearside Rear Direction indicators not working |1.5.1c| | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Front Horn not working |1.7.3a| | 4 |
| Offside Steering lock stop ineffective |2.1.3| | 4 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 4 |
| Rear Drive chain worn to excess |6.2.1e| | 4 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 4 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 4 |
| Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Rear Brake disc|s| cracked |3.2.A1g| | 4 |
| Drive chain fouling another component |6.2.1d| | 4 |
| Offside Rear Footrest missing |6.2.1a| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Rear Brake disc|s| is excessively distorted |3.2.A1m| | 3 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 3 |
| Offside Direction indicator flashing more than 120 times per minute |1.5.1c| | 3 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Nearside Steering lock stop ineffective |2.1.3| | 3 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| 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| | 3 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 3 |
| Nearside Front Footrest insecure |6.2.1a| | 3 |
| Chain guard insecure |6.2.1c| | 3 |
| Offside Rear Direction indicator insecure |1.5.3b| | 3 |
| Riders seat insecure |6.2.1a| | 3 |
| Rear Roller brake test indicates a severely juddering brake |3.3.A1b| | 3 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 3 |
| Offside Front Direction indicator damaged and function impaired |1.5.3a| | 3 |
| Nearside Direction indicator flashing more than 120 times per minute |1.5.1c| | 3 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 3 |