| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 140 |
| Registration plate issues | 89 |
| Rear reflector on motorcycle missing |1.4.1| | 76 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 51 |
| Front Wheel spoke excessively loose |4.2.1b| | 45 |
| Horn not working |1.7.3a| | 40 |
| Drive chain excessively loose |6.2.1d| | 39 |
| Drive chain worn to excess |6.2.1e| | 37 |
| Rear Wheel spoke excessively loose |4.2.1b| | 32 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 31 |
| Front wheel bearings have excessive free play |2.3.5b| | 30 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 28 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 26 |
| Steering headbearing has excessive free play |2.2.2| | 25 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 24 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 24 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 22 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 22 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 22 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 19 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 19 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 19 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 17 |
| Rear Footrest missing |6.2.1a| | 17 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 16 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 14 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 13 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 13 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 12 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 12 |
| Nearside Rear Direction indicator not working |1.5.1c| | 12 |
| Drive chain excessively tight |6.2.1d| | 12 |
| Headlamp aim beam image kick up to the offside |1.6| | 12 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 12 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 11 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 11 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 11 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 10 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 10 |
| Nearside Rear Footrest missing |6.2.1a| | 9 |
| Offside Rear Footrest missing |6.2.1a| | 9 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 9 |
| Offside Rear Direction indicator not working |1.5.1c| | 8 |
| Nearside Front Direction indicator not working |1.5.1c| | 8 |
| Throttle operating incorrectly |6.2.1f| | 8 |
| Nearside Front Direction indicators not working |1.5.1c| | 8 |
| Rear Drive chain excessively loose |6.2.1d| | 8 |
| Rear reflector missing (4.8.2 (a) (ii)) | 8 |
| Direction indicators not working |1.5.1c| | 8 |
| Stop lamp remains on when the brakes are released | 8 |
| Offside Front Direction indicators not working |1.5.1c| | 7 |
| Offside Rear Direction indicators not working |1.5.1c| | 7 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 7 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 7 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 7 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 7 |
| Riders seat insecure |6.2.1a| | 7 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 7 |
| 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| | 7 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 7 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 7 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 7 |
| Front Direction indicator not working |1.5.1c| | 7 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 6 |
| Headlamp insecure |1.2.3b| | 6 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 6 |
| Rear Direction indicator flashing more than 120 times per minute |1.5.1c| | 6 |
| Rear Direction indicator not working |1.5.1c| | 6 |
| Direction indicator not working |1.5.1c| | 6 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 6 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 6 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 6 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 6 |
| Nearside Rear Direction indicators not working |1.5.1c| | 6 |
| Horn is not a constant note |1.7.3c| | 6 |
| Rear Drive chain worn to excess |6.2.1e| | 6 |
| Offside Rear Direction indicator missing |1.5.1a| | 6 |
| Horn is not continous or uniform |1.7.3c| | 5 |
| Headlamp aim not tested |1.6| | 5 |
| Offside Front Direction indicator not working |1.5.1c| | 5 |
| Front Direction indicator missing |1.5.1a| | 5 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 5 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 5 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 5 |
| Rear Brake hose which buldges |3.2.B4| | 5 |
| Horn not working (7.7 (a) (ii)) | 5 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 5 |
| Front Brake lever insecure |3.1.2a| | 5 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 4 |
| Handlebar deformed |2.1.1b| | 4 |
| Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 4 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Nearside Direction indicator flashing more than 120 times per minute |1.5.1c| | 4 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 4 |
| Rear Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 4 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 4 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 4 |
| Rear Direction indicators not working |1.5.1c| | 4 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Rear Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 4 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 4 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 4 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 4 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 4 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 4 |
| Rear reflector missing |4.8.2 |a| |ii|| | 4 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 4 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Front wheel bearings are excessively rough |2.3.5b| | 4 |
| Rear Brake pipe likely to be fouled or trapped by moving parts |3.2.B2c| | 3 |
| Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Lower Rear suspension bearing has excessive free play |2.4.A2a|i|| | 3 |
| Brake master cylinder fluid level dangerously low |3.2.B1d| | 3 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Exhaust mounting missing |7.1.1c| | 3 |
| Rear position lamp incorrect colour |1.1.2b| | 3 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 3 |
| Front Wheel spoke missing |4.2.1b| | 3 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Fuel system component leaking |7.2.1a| | 3 |
| Rear Direction indicator missing |1.5.1a| | 3 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 3 |
| Offside Direction indicator flashing more than 120 times per minute |1.5.1c| | 3 |
| Offside Direction indicator flashing less than 60 times a minute |1.5.1c| | 3 |
| Exhaust excessively deteriorated |7.1.1a| | 3 |
| Front Direction indicators not working |1.5.1c| | 3 |
| Front Steering headbearing has excessive free play |2.2.2| | 3 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Rear reflector on motorcycle dirty and function impaired |1.4.2a| | 3 |
| Lower Rear mono-shock pivot excessively worn |2.4.B.4| | 3 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 3 |
| Footrest missing |6.2.1a| | 3 |
| Front Wheel bearing has excessive play |5.1.3 |a| |i|| | 3 |
| Direction indicator affected by the operation of another lamp |1.5.1c| | 3 |
| Front Brake lever attachment screws missing |3.1.2b| | 3 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 3 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Nearside Direction indicator not working |1.5.1c| | 3 |
| Offside Direction indicator not working |1.5.1c| | 3 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |
| Registration plate lamp issues | 3 |
| Rear Position lamp not working (4.2.1 (a)) | 3 |
| Offside Front Direction indicator missing |1.5.1a| | 3 |
| Nearside Front Direction indicator missing |1.5.1a| | 3 |
| Nearside Rear Direction indicator missing |1.5.1a| | 3 |
| Front Direction indicator incorrect colour |1.5.1b| | 3 |