| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 15 |
| Rear reflector on motorcycle missing |1.4.1| | 14 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 9 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 7 |
| Steering headbearing has excessive free play |2.2.2| | 7 |
| Horn not working |1.7.3a| | 7 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 6 |
| Drive chain excessively loose |6.2.1d| | 6 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 5 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Front wheel bearings are excessively rough |2.3.5b| | 4 |
| Direction indicators not working |1.5.1c| | 4 |
| Headlamp aim not tested |1.6| | 4 |
| Drive chain worn to excess |6.2.1e| | 4 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Headlamp insecure |1.2.3b| | 4 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Rear Wheel spoke cracked. |4.2.1b| | 3 |
| Registration plate issues | 3 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Rear reflector on motorcycle obscured |1.4.1| | 3 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Upper Rear mono-shock pivot excessively worn |2.4.B.4| | 3 |
| 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| | 2 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Nearside Rear Direction indicator not working |1.5.1c| | 2 |
| Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 2 |
| Front position lamp insecure |1.1.1c| | 2 |
| Handlebar deformed |2.1.1b| | 2 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Rear position lamp insecure |1.1.1c| | 2 |
| Rear Brake pedal insecure |3.1.2a| | 2 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 2 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Rear Wheel spoke missing |4.2.1b| | 1 |
| Rear Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 1 |
| Rear Brake component is severely distorted |3.1.5| | 1 |
| Rear Brake component has an inadequate repair |3.1.5| | 1 |
| Rear Brake component is fractured |3.1.5| | 1 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 1 |
| Rear Wheel spoke excessively loose |4.2.1b| | 1 |
| Brake performance not tested |3.3| | 1 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 1 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 1 |
| Front Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Position lamp switch insecure |1.1.4b| | 1 |
| Rear Footrest missing |6.2.1a| | 1 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Rear Brake linkage has abnormal movement due to excessive wear |3.2.A1i| | 1 |
| Rear Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 1 |
| Nearside Front Rear suspension bearing has excessive free play |2.4.A2a|i|| | 1 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 1 |
| Offside Rear Direction indicator not working |1.5.1c| | 1 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 1 |
| Front Hydraulic brake control creeps under load. |3.1.4a| | 1 |
| Rear Front wheel spindle securing nut locking device insecure |2.3.3a| | 1 |
| Brake reaction bracket securing bolt|s| missing |3.2.A1j| | 1 |
| Front Wheel has an excessively eccentric bead rim. |4.2.2| | 1 |
| Nearside Direction indicator missing |1.5.1a| | 1 |
| Offside Direction indicator missing |1.5.1a| | 1 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 1 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Nearside Direction indicator not working |1.5.1c| | 1 |
| Offside Direction indicator not working |1.5.1c| | 1 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Direction indicator not working |1.5.1c| | 1 |
| Brake locking device missing |3.2.A1e| | 1 |
| Nearside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Nearside Rear Direction indicators not working |1.5.1c| | 1 |
| Indicator tell tale not functioning |1.5.2| | 1 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 1 |
| Front Steering headbearing has excessive free play |2.2.2| | 1 |
| Rear Rear wheel rotation likely to be impeded |6.2.1b| | 1 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 1 |
| Nearside Direction indicators flashing more than 120 times per minute |1.5.1c| | 1 |
| Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Front Lower Steering headbearing has excessive free play |2.2.2| | 1 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride chain spring link wrong way round |6.2.1h| | 1 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride steering head top nut loose |6.2.1h| | 1 |
| Rear reflector missing (4.8.2 (a) (ii)) | 1 |
| Rear Wheel fixing missing (single fixing) (5.2.1 (a) (ii)) | 1 |
| Horn sounds harsh or grating |1.7.3c| | 1 |
| Rear Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Direction indicator affected by the operation of another lamp |1.5.1c| | 1 |
| Riders seat insecure |6.2.1a| | 1 |
| Rear Direction indicator insecure |1.5.3b| | 1 |
| Rear Wheel has an excessively distorted bead rim. |4.2.2| | 1 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Front All position lamps do not illuminate immediately when switched on |1.1.3a| | 1 |
| Rear All position lamps do not illuminate immediately when switched on |1.1.3a| | 1 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 1 |
| Offside Front Footrest insecure |6.2.1a| | 1 |
| Nearside Front Footrest insecure |6.2.1a| | 1 |
| Rear Brake pedal cannot be applied smoothly |3.1.3d| | 1 |
| Nearside Headlamp switch insecure |1.2.4| | 1 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 1 |
| Headlamp aim beam image kick up to the offside |1.6| | 1 |
| Brake pedal cannot be applied smoothly |3.1.3d| | 1 |
| Brake pedal cannot be released smoothly |3.1.3d| | 1 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 1 |
| Direction indicator deteriorated and function impaired |1.5.3a| | 1 |
| Nearside Rear Footrest missing |6.2.1a| | 1 |
| Offside Rear Footrest missing |6.2.1a| | 1 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 1 |
| Headlamp switch faulty |1.2.4| | 1 |
| Front Brake performance not tested |3.3| | 1 |
| Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Front Brake hose excessively kinked |3.2.B3a| | 1 |
| Nearside Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Offside Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Rear Direction indicator not working |1.5.1c| | 1 |
| Front Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 1 |
| Front Chain guard insecure |6.2.1c| | 1 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 1 |
| Horn control defective |1.7.2a| | 1 |
| Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Rear wheel spindle securing nut locking device insecure |2.4.A.2b| | 1 |
| Rear wheel bearings are excessively tight |2.4.A.2c| | 1 |
| Chain guard fouling another component |6.2.1c| | 1 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 1 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Rear Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 1 |
| Rear Brake rod excessively damaged |3.2.A1c| | 1 |
| Brake lever cannot be applied smoothly |3.1.3d| | 1 |
| Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 1 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Front Exhaust excessively deteriorated |7.1.1a| | 1 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 1 |
| Rear Drive chain excessively loose |6.2.1d| | 1 |
| Nearside Upper Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Offside Upper Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Rear Upper Motorcycle structure cracked |6.1.1a| | 1 |
| Front Position lamp not working |4.2.1 |a|| | 1 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 1 |