| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 615 |
| Rear reflector on motorcycle missing |1.4.1| | 466 |
| Steering headbearing has excessive free play |2.2.2| | 252 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 183 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 144 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 142 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 142 |
| Registration plate issues | 129 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 127 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 126 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 119 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 106 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 105 |
| Fuel cap sealing washer missing |7.2.2c| | 64 |
| Front suspension has inadequate damping effect. |2.3.6c| | 63 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 63 |
| Rear position lamp insecure |1.1.1c| | 54 |
| 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| | 52 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 49 |
| Front Steering headbearing has excessive free play |2.2.2| | 47 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 43 |
| Riders seat insecure |6.2.1a| | 42 |
| Headlamp insecure |1.2.3b| | 41 |
| Nearside Front Direction indicator not working |1.5.1c| | 41 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 41 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 40 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 39 |
| Offside Front Direction indicator not working |1.5.1c| | 38 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 35 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 35 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 34 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 34 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 34 |
| Horn not working |1.7.3a| | 33 |
| Front wheel bearings have excessive free play |2.3.5b| | 28 |
| Front wheel bearings are excessively rough |2.3.5b| | 27 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 27 |
| Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 26 |
| Rear reflector on motorcycle obscured |1.4.1| | 26 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 26 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 26 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 25 |
| Offside Front Direction indicators not working |1.5.1c| | 24 |
| Headlamp aim not tested |1.6| | 23 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 22 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 22 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 22 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 22 |
| Rear reflector missing (4.8.2 (a) (ii)) | 22 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 21 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 20 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 19 |
| Throttle operating incorrectly |6.2.1f| | 19 |
| Nearside Front Direction indicators not working |1.5.1c| | 19 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 19 |
| Rear Brake lever insecure |3.1.2a| | 18 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 18 |
| Direction indicators not working |1.5.1c| | 18 |
| Offside Steering lock stop ineffective |2.1.3| | 17 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 17 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 17 |
| Brake lever has inadequate reserve travel |3.1.3b| | 17 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 17 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 17 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 17 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 17 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 16 |
| Offside Rear Direction indicator not working |1.5.1c| | 16 |
| Rear position lamp incorrect colour |1.1.2b| | 15 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 15 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 15 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 15 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 14 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 14 |
| Front suspension assembly component loose |2.3.1| | 13 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 13 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 13 |
| Stop lamp remains on when the brake is released |1.3.1e| | 13 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 13 |
| Front Fairings insecure and likely to impede the steering |2.1.2e| | 13 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 12 |
| Indicator tell tale not functioning |1.5.2| | 12 |
| Nearside Rear Direction indicator not working |1.5.1c| | 12 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 11 |
| An item not tested |Manual| | 11 |
| Nearside Front Brake lever has inadequate reserve travel |3.1.3b| | 11 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 11 |
| Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 11 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 11 |
| Exhaust mounting missing |7.1.1c| | 10 |
| Fuel system component leaking |7.2.1a| | 10 |
| Rear Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 10 |
| Steering movement excessively rough with the wheel raised |2.2.1b| | 10 |
| Headlamp aim beam image kick up to the offside |1.6| | 10 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 10 |
| Horn sounds harsh or grating |1.7.3c| | 10 |
| Nearside Rear Direction indicators not working |1.5.1c| | 10 |
| Steering movement excessively rough with the weight on the lower bearing |2.2.1a| | 10 |
| Front position lamp incorrect colour |1.1.2a| | 10 |
| Nearside Brake lever has inadequate reserve travel |3.1.3b| | 10 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 10 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 10 |
| Offside Rear Direction indicators not working |1.5.1c| | 9 |
| Stop lamp emits other than a steady red light |1.3.1b| | 9 |
| Rear Brake lever cannot be released smoothly |3.1.3d| | 9 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 9 |
| Exhaust excessively deteriorated |7.1.1a| | 9 |
| Front suspension assembly component excessively bent |2.3.1| | 9 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 9 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 9 |
| Rear reflector missing |4.8.2 |a| |ii|| | 9 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 9 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Rear Position lamp not working (4.2.1 (a)) | 9 |