| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 320 |
| Rear reflector on motorcycle missing |1.4.1| | 206 |
| Steering headbearing has excessive free play |2.2.2| | 80 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 80 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 67 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 66 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 62 |
| Fuel cap sealing washer missing |7.2.2c| | 61 |
| Registration plate issues | 53 |
| Horn not working |1.7.3a| | 50 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 44 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 43 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 42 |
| Front suspension has inadequate damping effect. |2.3.6c| | 41 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 40 |
| Riders seat insecure |6.2.1a| | 34 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 33 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 29 |
| Front wheel bearings have excessive free play |2.3.5b| | 28 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 26 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 25 |
| Rear position lamp insecure |1.1.1c| | 25 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 25 |
| Rear reflector on motorcycle obscured |1.4.1| | 25 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 22 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 22 |
| Rear reflector missing (4.8.2 (a) (ii)) | 21 |
| Offside Front Direction indicators not working |1.5.1c| | 20 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 19 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 19 |
| Offside Front Direction indicator not working |1.5.1c| | 17 |
| Front wheel bearings are excessively rough |2.3.5b| | 17 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 17 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 16 |
| Headlamp insecure |1.2.3b| | 16 |
| Nearside Front Direction indicator not working |1.5.1c| | 15 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 15 |
| Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 14 |
| Nearside Rear Direction indicators not working |1.5.1c| | 14 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 14 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 14 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 13 |
| Rear Shock absorber has negligible damping effect |5.3.2 |b|| | 12 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 12 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 11 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 11 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 11 |
| Registration plate lamp issues | 11 |
| Nearside Rear Direction indicator not working |1.5.1c| | 11 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 11 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 10 |
| Rear reflector missing |4.8.2 |a| |ii|| | 10 |
| Nearside Brake lever has inadequate reserve travel |3.1.3b| | 10 |
| 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| | 10 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 9 |
| Nearside Front Direction indicators not working |1.5.1c| | 9 |
| Headlamp aim not tested |1.6| | 9 |
| Front Steering headbearing has excessive free play |2.2.2| | 9 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 9 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 9 |
| Headlamp aim beam image kick up to the offside |1.6| | 9 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 9 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 9 |
| Front Shock absorber has negligible damping effect (5.3.2 (b)) | 9 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 8 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 8 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 8 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 8 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 8 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 8 |
| Throttle operating incorrectly |6.2.1f| | 8 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 8 |
| Exhaust excessively deteriorated |7.1.1a| | 7 |
| Brake lever has inadequate reserve travel |3.1.3b| | 7 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 7 |
| Offside Steering lock stop ineffective |2.1.3| | 7 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 7 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 7 |
| Indicator tell tale not functioning |1.5.2| | 7 |
| Rear Brake lever has insufficient reserve travel (1.1.2 (a)) | 7 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 7 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 7 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 6 |
| Fuel cap sealing washer deteriorated |7.2.2c| | 6 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 6 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 6 |
| Nearside Rear Footrest missing |6.2.1a| | 6 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 6 |
| Fuel system component leaking |7.2.1a| | 6 |
| Front Fairings insecure and likely to impede the steering |2.1.2e| | 6 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 6 |
| Rear Brake lever insecure |3.1.2a| | 6 |
| Rear wheel rotation likely to be impeded |6.2.1b| | 6 |
| Stop lamp remains on when the brake is released |1.3.1e| | 6 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 6 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 6 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 6 |
| Headlamp aim so that beam "kick up" is not visible on the screen |1.6.B.1| | 5 |
| Rear reflector on motorcycle obscured |1.4.2b| | 5 |
| Direction indicators not working |1.5.1c| | 5 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 5 |
| Offside Rear Direction indicator not working |1.5.1c| | 5 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 5 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 5 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 5 |
| Indicator switch insecure |1.5.4| | 5 |
| Front suspension assembly component excessively bent |2.3.1| | 5 |
| Rear wheel insecure |4.2.3b| | 5 |
| Rear position lamp incorrect colour |1.1.2b| | 5 |
| Front Brake disc|s| excessively scored |3.2.A1l| | 5 |
| Front Shock absorber has negligible damping effect |5.3.2 |b|| | 5 |
| Front Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 5 |
| Front Wheel bearing rough when rotated |5.1.3 |b| |i|| | 5 |
| Stop lamp emits other than a steady red light |1.3.1b| | 5 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 5 |
| Riders seat insecure (6.2.5 (a) (ii)) | 5 |
| Fuel cap leaking (6.1.3 (b) (i)) | 5 |
| Horn not working (7.7 (a) (ii)) | 5 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 5 |