| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 150 |
| Rear reflector on motorcycle missing |1.4.1| | 95 |
| Registration plate issues | 81 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 35 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 31 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 29 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 29 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 27 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 24 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 23 |
| Horn not working |1.7.3a| | 23 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 22 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 21 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 20 |
| Drive chain excessively loose |6.2.1d| | 20 |
| 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| | 20 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 20 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 20 |
| Headlamp aim beam image kick up to the offside |1.6| | 20 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 15 |
| Drive chain worn to excess |6.2.1e| | 14 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 14 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 13 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 13 |
| Brake pipe excessively corroded | 13 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 12 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 12 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 12 |
| Front wheel bearings are excessively rough |2.3.5b| | 12 |
| Drive chain excessively tight |6.2.1d| | 11 |
| Steering headbearing has excessive free play |2.2.2| | 11 |
| Registration plate lamp issues | 11 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 10 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 10 |
| Nearside Front Direction indicator not working |1.5.1c| | 10 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 10 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 9 |
| Riders seat insecure |6.2.1a| | 9 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 9 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 9 |
| Parking brake: efficiency below requirements |3.7.B.7| | 9 |
| Nearside Rear Direction indicator not working |1.5.1c| | 8 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 8 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 8 |
| Offside Rear Direction indicator not working |1.5.1c| | 8 |
| Front Horn not working |1.7.3a| | 8 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 8 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 7 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 7 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 7 |
| Offside Front Direction indicator not working |1.5.1c| | 7 |
| Offside Rear Footrest missing |6.2.1a| | 7 |
| Nearside Front Direction indicators not working |1.5.1c| | 7 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Rear Footrest missing |6.2.1a| | 7 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 7 |
| Windscreen wiper does not clear the windscreen effectively | 6 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 6 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 6 |
| Exhaust excessively deteriorated |7.1.1a| | 6 |
| Nearside Rear Footrest missing |6.2.1a| | 6 |
| Rear parking brake recording little or no effort | 6 |
| Rear Brake locking device missing |3.2.A1e| | 6 |
| Nearside Rear Direction indicators not working |1.5.1c| | 6 |
| Rear Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 6 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 6 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 5 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 5 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 5 |
| Horn not working |1.6.2a| | 5 |
| Throttle operating incorrectly |6.2.1f| | 5 |
| Centre Exhaust is leaking and excessively noisey |7.1.1b| | 5 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 5 |
| Offside Front Direction indicators not working |1.5.1c| | 5 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 5 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 5 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 4 |
| Nearside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Offside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 4 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 4 |
| Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 4 |
| Rear Brake disc|s| is excessively distorted |3.2.A1m| | 4 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 4 |
| Front Direction indicators not working |1.5.1c| | 4 |
| Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 4 |
| Nearside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 4 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Offside Front Footrest insecure |6.2.1a| | 4 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 4 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 4 |
| Front Steering headbearing has excessive free play |2.2.2| | 4 |
| Parking brake lever has no reserve travel |3.1.6b| | 4 |
| Headlamp aim not tested |1.6| | 4 |
| Offside Front Suspension component mounting prescribed area is excessively corroded |2.4.A.3| | 4 |
| Exhaust emissions carbon monoxide content excessive |7.3.B.1a| | 4 |
| Parking brake: efficiency below requirements |3.7.C.1b| | 4 |
| Fuel system component leaking |7.2.1a| | 4 |
| Rear Drive chain worn to excess |6.2.1e| | 4 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Exhaust has a major leak of exhaust gases |7.1.2| | 4 |
| Front suspension has inadequate damping effect. |2.3.6c| | 4 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 3 |
| Rear reflector on motorcycle obscured |1.4.1| | 3 |
| Rear Stop lamp does not emit a steady light |1.3.1b| | 3 |
| Rear Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 3 |
| Front Brake disc|s| is excessively distorted |3.2.A1m| | 3 |
| Nearside Rear Direction indicator missing |1.5.1a| | 3 |
| Direction indicator missing |1.5.1a| | 3 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Rear Hydraulic brake control feels spongy |3.1.4a| | 3 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 3 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 3 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 3 |
| Front Exhaust has a major leak of exhaust gases |7.1.2| | 3 |
| Nearside Headlamp not in good working order adversely affecting beam image |1.2.4a| | 3 |
| Offside Rear Suspension component mounting prescribed area is excessively corroded |2.4.A.3| | 3 |
| Nearside Front Seat belt anchorage prescribed area is excessively corroded |5.2.6| | 3 |
| Offside Front Seat belt anchorage prescribed area is excessively corroded |5.2.6| | 3 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 3 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Rear Direction indicators not working |1.5.1c| | 3 |
| Front Direction indicator missing |1.5.1a| | 3 |
| Offside Front Brake disc|s| insecure |3.2.A1g| | 3 |
| Rear reflector missing |4.8.2 |a| |ii|| | 3 |
| Headlamp insecure |1.2.3b| | 3 |
| Headlamp incorrect colour |1.2.1| | 3 |
| Brake hose excessively deteriorated | 3 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 3 |
| Offside Rear Direction indicators not working |1.5.1c| | 3 |
| Offside Direction indicators not working |1.5.1c| | 3 |
| Rear Brake pedal is inoperative |3.1.3c| | 3 |
| Front position lamp missing |1.1.1a| | 3 |
| Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Horn is not continous or uniform |1.7.3c| | 3 |
| Direction indicators not working |1.5.1c| | 3 |
| Offside Headlamp not working on dipped beam |1.7.5a| | 3 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 3 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |