| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 171 |
| Registration plate issues | 50 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 38 |
| Rear reflector on motorcycle missing |1.4.1| | 36 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 36 |
| Horn not working |1.7.3a| | 36 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 34 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 32 |
| Steering headbearing has excessive free play |2.2.2| | 28 |
| Drive chain excessively loose |6.2.1d| | 27 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 27 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 25 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 25 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 23 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 22 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 22 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 18 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 15 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Drive chain worn to excess |6.2.1e| | 13 |
| Front suspension has inadequate damping effect. |2.3.6c| | 13 |
| Direction indicators not working |1.5.1c| | 13 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 13 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 13 |
| Headlamp aim beam image kick up to the offside |1.6| | 13 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 12 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 12 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 12 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 12 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 11 |
| Throttle operating incorrectly |6.2.1f| | 11 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 11 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 11 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 11 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 11 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 10 |
| Front wheel bearings have excessive free play |2.3.5b| | 10 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Rear suspension has corrosion which reduces the strength of a load bearing member or its supporting structure. |2.4.A.2d| | 10 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 10 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 9 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 9 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 9 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 9 |
| Riders seat insecure |6.2.1a| | 9 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 9 |
| Registration plate lamp issues | 9 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 8 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 8 |
| Front wheel bearings are excessively rough |2.3.5b| | 8 |
| Nearside Front Direction indicators not working |1.5.1c| | 8 |
| Front wheel spindle securing nut locking device missing |2.3.3a| | 8 |
| Rear Position lamp not working (4.2.1 (a)) | 8 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 7 |
| Brake lever has inadequate reserve travel |3.1.3b| | 7 |
| Nearside Rear Direction indicator not working |1.5.1c| | 7 |
| Drive chain excessively tight |6.2.1d| | 7 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 7 |
| Stop lamp remains on when the brake is released |1.3.1e| | 7 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 7 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 7 |
| Rear parking brake recording little or no effort | 6 |
| Parking brake: efficiency below requirements |3.7.B.7| | 6 |
| Brake locking device missing |3.2.A1e| | 6 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Offside Rear Direction indicator not working |1.5.1c| | 6 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 6 |
| Offside Direction indicator not working |1.5.1c| | 6 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 6 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 5 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 5 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Headlamp insecure |1.2.3b| | 5 |
| Fuel system component leaking |7.2.1a| | 5 |
| Front Steering headbearing has excessive free play |2.2.2| | 5 |
| Nearside Rear Direction indicators not working |1.5.1c| | 5 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 5 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 5 |
| Nearside Rear reflector missing |1.5.1a| | 5 |
| Offside Rear Footrest insecure |6.2.1a| | 5 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 5 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 5 |
| Front wheel spindle securing nut locking device missing |2.3.5a| | 5 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 5 |
| Nearside Front Direction indicator not working |1.5.1c| | 5 |
| Front position lamp incorrect colour |1.1.2a| | 5 |
| Fuel system component insecure |7.2.1b| | 5 |
| Rear Brake locking device missing |3.2.A1e| | 5 |
| Stop lamp remains on when the brakes are released | 5 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Front suspension assembly component loose |2.3.1| | 4 |
| Rear Drive chain worn to excess |6.2.1e| | 4 |
| 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| | 4 |
| Headlamp aim not tested |1.6| | 4 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 4 |
| Direction indicator not working |1.5.1c| | 4 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 4 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 4 |
| Exhaust excessively deteriorated |7.1.1a| | 4 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 4 |
| Rear suspension component excessively corroded. |2.4.A.1a| | 4 |
| Nearside Footrest insecure |6.2.1a| | 4 |
| Offside Rear Direction indicators not working |1.5.1c| | 4 |
| Indicator tell tale not functioning |1.5.2| | 4 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 4 |
| Rear Drive chain excessively loose |6.2.1d| | 4 |
| Front mudguard insecure |2.3.7| | 4 |
| Front Brake fluid reservoir leaking hydraulic fluid |3.2.B1e| | 4 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 4 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |