| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 144 |
| Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 84 |
| Rear Wheel spoke excessively loose |4.2.1b| | 44 |
| Horn not working |1.7.3a| | 42 |
| Registration plate issues | 39 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 38 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 38 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 36 |
| Drive chain excessively loose |6.2.1d| | 33 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 33 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 30 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 30 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 29 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 28 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 27 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 26 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 25 |
| Steering headbearing has excessive free play |2.2.2| | 24 |
| Front suspension assembly has excessive free play in the pivot bearings. |2.3.2| | 24 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 19 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 19 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 18 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 18 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 17 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 17 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 17 |
| Front Steering linkage has excessive free play |2.2.2| | 16 |
| Front wheel spindle securing nut locking device missing |2.3.3a| | 16 |
| Direction indicators not working |1.5.1c| | 15 |
| Rear Motorcycle structure excessively corroded |6.1.1a| | 15 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 15 |
| Drive chain excessively tight |6.2.1d| | 14 |
| Riders seat insecure |6.2.1a| | 14 |
| Brake lever has inadequate reserve travel |3.1.3b| | 12 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 12 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 11 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 11 |
| Stop lamp remains on when the brake is released |1.3.1e| | 11 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 11 |
| Steering linkage has excessive free play |2.2.2| | 11 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 11 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 11 |
| Front Steering headbearing has excessive free play |2.2.2| | 11 |
| Nearside Rear Direction indicator not working |1.5.1c| | 11 |
| Rear Brake pedal pivots excessively worn |3.1.3a| | 11 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 10 |
| Offside Rear Direction indicator insecure |1.5.3b| | 10 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 10 |
| Throttle operating incorrectly |6.2.1f| | 10 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 10 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 10 |
| Rear Wheel has an excessively distorted bead rim. |4.2.2| | 10 |
| Front Front suspension assembly has excessive free play in the pivot bearings. |2.3.2| | 10 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 9 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 9 |
| Drive chain worn to excess |6.2.1e| | 9 |
| Offside Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 9 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 9 |
| Rear Brake locking device missing |3.2.A1e| | 9 |
| Front wheel bearings have excessive free play |2.3.5b| | 8 |
| Front Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 8 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 8 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 8 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 8 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 7 |
| Front wheel spindle securing nut locking device missing |2.3.5a| | 7 |
| Brake locking device missing |3.2.A1e| | 7 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 7 |
| Direction indicator not working |1.5.1c| | 7 |
| Horn not working (7.7 (a)) | 7 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 7 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 7 |
| Rear Position lamp not working (4.2.1 (a)) | 7 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 7 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 7 |
| Rear Brake linkage has abnormal movement due to excessive wear |3.2.A1i| | 7 |
| Nearside Front Direction indicator not working |1.5.1c| | 7 |
| Handlebar mounting clamp loose |2.1.1a| | 7 |
| Nearside Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 7 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 7 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 7 |
| Horn not working (7.7 (a) (ii)) | 6 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 6 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 6 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 6 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 6 |
| Offside Rear Direction indicator not working |1.5.1c| | 6 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 6 |
| Rear Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 6 |
| All position lamps adversely affected by the operation of another lamp |1.1.3b| | 6 |
| Headlamp switch faulty |1.2.4| | 6 |
| All direction indicators not working (4.4.1 (a) (ii)) | 6 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 5 |
| Horn not working |7.7 |a| |ii|| | 5 |
| Front Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 5 |
| Rear suspension has corrosion which reduces the strength of a load bearing member or its supporting structure. |2.4.A.2d| | 5 |
| Front suspension has inadequate damping effect. |2.3.6c| | 5 |
| Rear shock absorber insecurely mounted |2.4.A.3b| | 5 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 5 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 5 |
| Offside Front Direction indicator insecure |1.5.3b| | 5 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 5 |
| Front suspension assembly component loose |2.3.1| | 5 |
| Front Wheel spoke excessively loose |4.2.1b| | 5 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Fuel system component leaking |7.2.1a| | 5 |
| Horn is not continous or uniform |1.7.3c| | 5 |
| Rear Brake back plate|s| insecure |3.2.A1j| | 5 |
| Rear Wheel spindle locking device missing (5.2.1 (d)) | 5 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 5 |
| Front Direction indicator not working |1.5.1c| | 4 |
| Front Front suspension assembly component loose |2.3.1| | 4 |
| Front Suspension arm pin or bush excessively worn (5.3.4 (a) (i)) | 4 |
| Handlebar handgrip not secure to handlebars. |2.1.1c| | 4 |
| Front Front wheel spindle securing nut locking device missing |2.3.3a| | 4 |
| Offside Front Direction indicators not working |1.5.1c| | 4 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 4 |
| Nearside Rear Motorcycle structure excessively corroded |6.1.1a| | 4 |
| An item not tested |Manual| | 4 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Front Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 4 |
| Offside Rear Direction indicators not working |1.5.1c| | 4 |
| Offside Direction indicator not working |1.5.1c| | 4 |
| Stop lamp affected by the operation of the horn |1.3.2| | 4 |
| Rear Wheel spoke missing |4.2.1b| | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 4 |
| Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Nearside Front Footrest insecure |6.2.1a| | 4 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Front Front wheel spindle securing nut locking device missing |2.3.5a| | 4 |
| Nearside Front Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 4 |
| Front Wheel spindle locking device missing (5.2.1 (d)) | 4 |
| Direction indicator affected by the operation of another lamp |1.5.1c| | 4 |
| Exhaust mounting missing |7.1.1c| | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 4 |