| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 144 |
| Drive chain excessively loose |6.2.1d| | 36 |
| Horn not working |1.7.3a| | 36 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 35 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 33 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 33 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 31 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 30 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 26 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 24 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 22 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 20 |
| Registration plate issues | 20 |
| Drive chain worn to excess |6.2.1e| | 17 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 17 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 16 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 16 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 11 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 10 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 9 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 8 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 8 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 7 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 7 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Direction indicators not working |1.5.1c| | 7 |
| Registration plate lamp issues | 6 |
| Headlamp insecure |1.2.3b| | 6 |
| Front wheel bearings have excessive free play |2.3.5b| | 6 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 6 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 6 |
| Front Horn not working |1.7.3a| | 6 |
| Steering headbearing has excessive free play |2.2.2| | 5 |
| Handlebar deformed |2.1.1b| | 5 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 5 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Front Brake disc|s| is excessively distorted |3.2.A1m| | 5 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Rear Hydraulic brake control feels spongy |3.1.4a| | 4 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 4 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 4 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Horn not working |7.7 |a| |ii|| | 4 |
| Offside Direction indicators not working |1.5.1c| | 4 |
| Drive chain excessively tight |6.2.1d| | 4 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 4 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 4 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 3 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Rear Wheel has an excessively distorted bead rim. |4.2.2| | 3 |
| Rear reflector on motorcycle missing |1.4.1| | 3 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| An item not tested |Manual| | 3 |
| Offside Front Direction indicator not working |1.5.1c| | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 3 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 3 |
| Steering operation restricted in free movement from lock to lock |2.1.4 |c|| | 3 |
| Front wheel bearings are excessively rough |2.3.5b| | 3 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Nearside Front Direction indicator not working |1.5.1c| | 3 |
| Offside Front Direction indicator not working |4.4.1 |a| |ii|| | 3 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Rear Brake pipe union leaking fluid |3.2.B4| | 3 |