| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 73 |
| Drive chain excessively loose |6.2.1d| | 37 |
| Horn not working |1.7.3a| | 32 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 29 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 27 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 25 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 21 |
| Steering headbearing has excessive free play |2.2.2| | 20 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 20 |
| Registration plate issues | 20 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 19 |
| Rear Wheel spoke excessively loose |4.2.1b| | 18 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 16 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 15 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 15 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 15 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 15 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 14 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 13 |
| Front Wheel spoke excessively loose |4.2.1b| | 13 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 13 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 12 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 12 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 11 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 10 |
| Stop lamp remains on when the brake is released |1.3.1e| | 10 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 10 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 9 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 9 |
| Drive chain excessively tight |6.2.1d| | 9 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 9 |
| Nearside Front Direction indicator not working |1.5.1c| | 9 |
| Rear Brake locking device missing |3.2.A1e| | 9 |
| Handlebar mounting clamp loose |2.1.1a| | 9 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 9 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 9 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 9 |
| Offside Rear Direction indicator insecure |1.5.3b| | 9 |
| Brake lever has inadequate reserve travel |3.1.3b| | 8 |
| Front wheel bearings have excessive free play |2.3.5b| | 8 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 8 |
| Rear Wheel has an excessively distorted bead rim. |4.2.2| | 8 |
| Exhaust excessively deteriorated |7.1.1a| | 7 |
| Nearside Rear Direction indicator not working |1.5.1c| | 7 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 7 |
| Rear Motorcycle structure excessively corroded |6.1.1a| | 7 |
| Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 7 |
| Nearside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 7 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 7 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Offside Rear Direction indicator not working |1.5.1c| | 7 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 6 |
| Front Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 6 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 6 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 6 |
| Offside Rear Motorcycle structure excessively corroded |6.1.1a| | 6 |
| Offside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 6 |
| Rear Wheel has an excessively eccentric bead rim. |4.2.2| | 6 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 6 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 6 |
| Drive chain worn to excess |6.2.1e| | 6 |
| Front Steering headbearing has excessive free play |2.2.2| | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 6 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 5 |
| Rear Wheel spoke missing |4.2.1b| | 5 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 5 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 5 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 5 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 5 |
| Riders seat insecure |6.2.1a| | 5 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 5 |
| Rear Wheel spoke cracked. |4.2.1b| | 5 |
| Front Brake lever cannot be released smoothly |3.1.3d| | 5 |
| Horn not working (7.7 (a)) | 4 |
| Front Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 4 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 4 |
| Front suspension assembly component excessively bent |2.3.1| | 4 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 4 |
| Offside Front Direction indicator damaged and function impaired |1.5.3a| | 4 |
| Rear Drive chain excessively loose |6.2.1d| | 4 |
| Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Rear Brake pedal pivots excessively worn |3.1.3a| | 4 |
| Rear reflector on motorcycle missing |1.4.1| | 4 |
| Horn is not continous or uniform |1.7.3c| | 4 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 4 |
| Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 4 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 4 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Headlamp insecure |1.2.3b| | 3 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Rear Drive chain worn to excess |6.2.1e| | 3 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Rear Position lamp not working (4.2.1 (a)) | 3 |
| Stop lamp adversely affected by the operation of another lamp (4.3.3 (b)) | 3 |
| Rear Direction indicator affected by the operation of another lamp |1.5.1c| | 3 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 3 |
| Horn sound not in accordance with requirements (7.7 (c)) | 3 |
| All direction indicators adversely affected by the operation of another lamp (4.4.3 (b)) | 3 |
| Front Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Front Horn not working |1.7.3a| | 3 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Rear Rear wheel insecure |4.2.3b| | 3 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 3 |
| Throttle operating incorrectly |6.2.1f| | 3 |
| Rear wheel spindle loose |2.4.A.2b| | 3 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 3 |
| Floor brake test No brake control achieves an efficiency of 30%. |3.3.C1a| | 3 |
| Front Wheel has an excessively eccentric bead rim. |4.2.2| | 3 |
| Nearside Front Direction indicator insecure |1.5.3b| | 3 |
| Front Front wheel spindle securing nut locking device missing |2.3.5a| | 2 |
| Lower Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 2 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 2 |
| Direction indicator not working |1.5.1c| | 2 |
| Front Brake grabbing severely (1.2.1 (c)) | 2 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Rear shock absorber insecurely mounted |2.4.A.3b| | 2 |
| Offside Rear Direction indicators not working |1.5.1c| | 2 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Nearside Rear Motorcycle structure excessively corroded |6.1.1a| | 2 |
| Direction indicators not working |1.5.1c| | 2 |
| Nearside Footrest insecure |6.2.1a| | 2 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 2 |
| Nearside Rear Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 2 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Front Direction indicators flashing more than 120 times per minute |1.5.1c| | 2 |
| Brake locking device missing |3.2.A1e| | 2 |
| Rear position lamp insecure |1.1.1c| | 2 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Motorcycle structure excessively corroded |6.1.1a| | 2 |
| Brake pedal pivots excessively worn |3.1.3a| | 2 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 2 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 2 |
| Brake performance not tested (1.2.1 (g)) | 2 |
| Headlamp aim not tested |1.6| | 2 |
| Front suspension assembly has excessive free play in the pivot bearings. |2.3.2| | 2 |
| Brake reaction bracket insecure |3.2.A1j| | 2 |
| Rear suspension component excessively corroded. |2.4.A.1a| | 2 |
| Headlamp insecure (4.1.1 (c)) | 2 |
| Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Headlamp switch faulty |1.2.4| | 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 |
| Handlebar mounting excessively deteriorated |flexible type| |2.1.1d| | 2 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 2 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Direction indicator flashing less than 60 times a minute |1.5.1c| | 2 |
| Leg shield insecure and likely to impede the steering |2.1.2e| | 2 |
| Front suspension spring worn and seriously weakened |2.3.2b| | 2 |
| Front Brake effort inadequate at a wheel (1.2.1 (a) (i)) | 2 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 2 |
| Leg shield so located that it is likely to impede the steering |2.1.2e| | 2 |
| All direction indicators not working (4.4.1 (a) (ii)) | 2 |
| Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 2 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 2 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Front Brake cable excessively corroded |3.2.A1b| | 2 |
| Rear Brake reaction bracket securing bolt|s| missing |3.2.A1j| | 2 |
| Front suspension assembly component loose |2.3.1| | 2 |
| Stop lamp affected by the operation of the horn |1.3.2| | 2 |
| Central Rear Lower Brake indicates excessive fluctuation of brake effort rear brake (1.2.1 (e)) | 2 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 2 |
| Nearside Direction indicators affected by the operation of another lamp |1.5.1c| | 2 |
| Offside Direction indicators affected by the operation of another lamp |1.5.1c| | 2 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Front Brake cable has a significantly damaged outer casing. |3.2.A1b| | 2 |