| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 480 |
| Steering headbearing has excessive free play |2.2.2| | 318 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 244 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 239 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 221 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 125 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 118 |
| Horn not working |1.7.3a| | 115 |
| Front suspension has inadequate damping effect. |2.3.6c| | 106 |
| Registration plate issues | 104 |
| Rear reflector on motorcycle missing |1.4.1| | 102 |
| Riders seat insecure |6.2.1a| | 100 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 90 |
| Front Steering headbearing has excessive free play |2.2.2| | 87 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 86 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 84 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 83 |
| Direction indicators not working |1.5.1c| | 78 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 75 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 72 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 70 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 69 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 68 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 67 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 64 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 60 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 52 |
| Stop lamp remains on when the brake is released |1.3.1e| | 52 |
| Offside Front Direction indicator not working |1.5.1c| | 39 |
| Front wheel bearings have excessive free play |2.3.5b| | 38 |
| Nearside Front Direction indicator not working |1.5.1c| | 37 |
| Offside Steering lock stop ineffective |2.1.3| | 37 |
| Headlamp switch faulty |1.2.4| | 37 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 36 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 32 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 32 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 31 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 30 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 30 |
| Throttle operating incorrectly |6.2.1f| | 29 |
| Front Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 29 |
| Exhaust excessively deteriorated |7.1.1a| | 28 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 28 |
| Fuel cap sealing washer missing |7.2.2c| | 28 |
| Nearside Steering lock stop ineffective |2.1.3| | 27 |
| Rear Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 25 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 25 |
| Front wheel bearings are excessively rough |2.3.5b| | 25 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 24 |
| Headlamp aim not tested |1.6| | 23 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 23 |
| 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| | 22 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 22 |
| Offside Steering lock stop missing |2.1.3| | 22 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 22 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 22 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 21 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 20 |
| Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 20 |
| Front Direction indicators not working |1.5.1c| | 19 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 18 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 18 |
| Rear Brake lever cannot be released smoothly |3.1.3d| | 18 |
| Fuel system component leaking |7.2.1a| | 18 |
| Front Steering lock stop ineffective |2.1.3| | 18 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 17 |
| Brake lever has inadequate reserve travel |3.1.3b| | 16 |
| Nearside Rear Direction indicator not working |1.5.1c| | 16 |
| Steering movement excessively rough with the wheel raised |2.2.1b| | 16 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 16 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 16 |
| Offside Front Direction indicators not working |1.5.1c| | 16 |
| Nearside Front Direction indicators not working |1.5.1c| | 16 |
| Rear Direction indicators not working |1.5.1c| | 16 |
| Exhaust mounting missing |7.1.1c| | 15 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 15 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 15 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 15 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 15 |
| Direction indicator not working |1.5.1c| | 15 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 14 |
| Offside Rear Direction indicator not working |1.5.1c| | 14 |
| Headlamp insecure |1.2.3b| | 14 |
| Front Horn not working |1.7.3a| | 14 |
| Rear position lamp damaged and function impaired |1.1.1b| | 14 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 14 |
| Front Steering lock stop missing |2.1.3| | 14 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 13 |
| Nearside Steering lock stop missing |2.1.3| | 13 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 13 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 12 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 12 |
| Front Direction indicator not working |1.5.1c| | 12 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 12 |
| Stop lamp emits other than a steady red light |1.3.1b| | 12 |
| Steering movement excessively rough with the weight on the lower bearing |2.2.1a| | 12 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 12 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 11 |
| Indicator switch defective |1.5.4| | 11 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 11 |
| Stop lamp remains on when the brakes are released | 11 |
| Horn control defective |1.7.2a| | 11 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 10 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 10 |
| Front Fairings insecure and likely to impede the steering |2.1.2e| | 10 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 10 |
| Rear Direction indicator not working |1.5.1c| | 10 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 10 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 10 |
| Nearside Brake lever has inadequate reserve travel |3.1.3b| | 9 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 9 |
| Front Riders seat insecure |6.2.1a| | 9 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 9 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 9 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 9 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 9 |