| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 91 |
| Drive chain excessively loose |6.2.1d| | 43 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 37 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 35 |
| Headlamp insecure |1.2.3b| | 33 |
| 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| | 27 |
| Riders seat insecure |6.2.1a| | 25 |
| Registration plate issues | 23 |
| Steering headbearing has excessive free play |2.2.2| | 21 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 18 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 18 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 17 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 17 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 17 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 13 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 13 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 12 |
| Registration plate lamp issues | 10 |
| Front wheel bearings have excessive free play |2.3.5b| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 10 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 9 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 9 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 8 |
| Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 8 |
| Headlamp aim not tested |1.6| | 8 |
| Nearside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 7 |
| Horn not working |1.7.3a| | 7 |
| Drive chain worn to excess |6.2.1e| | 6 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 6 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 6 |
| Drive chain excessively tight |6.2.1d| | 6 |
| Offside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 6 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 5 |
| Chain guard insecure |6.2.1c| | 5 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 5 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 5 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 5 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 5 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 5 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Headlamp aim beam image kick up to the offside |1.6| | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Rear Position lamp not working (4.2.1 (a)) | 4 |
| Stop lamp remains on when the brakes are released | 4 |
| Nearside Front Footrest insecure |6.2.1a| | 4 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 4 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Rear reflector on motorcycle missing |1.4.1| | 4 |
| Front Steering headbearing has excessive free play |2.2.2| | 4 |
| Front Headlamp insecure |1.2.3b| | 4 |
| Front Front position lamp insecure |1.1.1c| | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 3 |
| Nearside Rear Direction indicator not working |1.5.1c| | 3 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 3 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 3 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Offside Footrest insecure |6.2.1a| | 3 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 3 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 3 |
| Front Brake excessively binding (1.2.1 (f)) | 3 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 3 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 3 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Handlebar deformed |2.1.1b| | 3 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 3 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 3 |
| Offside Front Direction indicators not working |1.5.1c| | 3 |
| Front Front mudguard insecure |2.3.7| | 3 |
| Rear position lamp damaged and function impaired |1.1.1b| | 3 |
| Rear Wheel has an excessively distorted bead rim. |4.2.2| | 3 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Direction indicators not working |1.5.1c| | 3 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Stop lamp missing |1.3.3a| | 3 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 3 |
| Rear Stop lamp affected by the operation of another lamp |1.3.2| | 3 |
| Rear Wheel spoke excessively loose |4.2.1b| | 3 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 3 |
| Rear Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 2 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 2 |
| Nearside Rear Footrest missing |6.2.1a| | 2 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Nearside Rear Direction indicator not working |4.4.1 |a| |ii|| | 2 |
| Front Front suspension assembly component excessively bent |2.3.1| | 2 |
| Stop lamp does not illuminate immediately a brake applies Control one |1.3.1a| | 2 |
| Handlebar mounting clamp loose |2.1.1a| | 2 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 2 |
| Rear Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Nearside Front Direction indicator insecure |1.5.3b| | 2 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 2 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Front Position lamp not working (4.2.1 (a)) | 2 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 2 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 2 |
| Front Position lamp not working |4.2.1 |a|| | 2 |
| Nearside Footrest insecure |6.2.1a| | 2 |
| Front Brake disc|s| excessively scored |3.2.A1l| | 2 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 2 |
| Offside Rear Direction indicators not working |1.5.1c| | 2 |
| Nearside Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Offside Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Drive chain sprocket excessively loose |6.1.7 |c| |i|| | 2 |
| Front Direction indicator not working |1.5.1c| | 2 |
| Stop lamp emits other than a steady red light |1.3.1b| | 2 |
| Nearside Direction indicator affected by the operation of another lamp |1.5.1c| | 2 |
| Offside Direction indicator affected by the operation of another lamp |1.5.1c| | 2 |
| Brake locking device missing |3.2.A1e| | 2 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 2 |
| Nearside Indicator tell tale not functioning |1.5.2| | 2 |
| Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 2 |
| Direction indicator affected by the operation of another lamp |1.5.1c| | 2 |
| Rear Drive chain worn to excess |6.2.1e| | 2 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Shock absorber has negligible damping effect both (5.3.2 (b)) | 2 |
| All direction indicators obviously incorrectly positioned (4.4.3 (a)) | 2 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Throttle operating incorrectly |6.2.1f| | 2 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Offside Rear Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 2 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 2 |
| Front Direction indicator flashing less than 60 times a minute |1.5.1c| | 2 |
| Rear Direction indicator flashing less than 60 times a minute |1.5.1c| | 2 |
| Front Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Rear Drive chain excessively loose |6.2.1d| | 2 |
| Front suspension assembly component excessively bent |2.3.1| | 2 |
| Front Wheel spoke excessively loose |4.2.1b| | 2 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 2 |