| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 170 |
| Rear reflector on motorcycle missing |1.4.1| | 130 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 64 |
| Registration plate issues | 54 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 51 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 48 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 41 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 39 |
| Steering headbearing has excessive free play |2.2.2| | 38 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 31 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 25 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 20 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 18 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 16 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 16 |
| Throttle operating incorrectly |6.2.1f| | 15 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 15 |
| Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 15 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Riders seat insecure |6.2.1a| | 13 |
| Horn not working |1.7.3a| | 13 |
| Stop lamp remains on when the brake is released |1.3.1e| | 11 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 11 |
| Rear reflector missing (4.8.2 (a) (ii)) | 11 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 11 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 10 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 10 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 9 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 9 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 9 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 9 |
| Rear reflector on motorcycle obscured |1.4.1| | 9 |
| Nearside Front Direction indicator not working |1.5.1c| | 9 |
| 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| | 9 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 9 |
| Direction indicators not working |1.5.1c| | 9 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 8 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 8 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Indicator switch defective |1.5.4| | 8 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 7 |
| Horn control defective |1.7.2a| | 7 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 7 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 7 |
| Front suspension has inadequate damping effect. |2.3.6c| | 7 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Rear reflector missing |4.8.2 |a| |ii|| | 6 |
| Offside Rear Direction indicators not working |1.5.1c| | 6 |
| Front position lamp incorrect colour |1.1.2a| | 6 |
| Nearside Lower Rear suspension bearing has excessive free play |2.4.A2a|i|| | 6 |
| Offside Lower Rear suspension bearing has excessive free play |2.4.A2a|i|| | 6 |
| Offside Rear Direction indicator not working |1.5.1c| | 5 |
| Rear Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 5 |
| Front Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 5 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 5 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Exhaust excessively deteriorated |7.1.1a| | 5 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Rear Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 4 |
| Rear position lamp deteriorated and function impaired |1.1.1b| | 4 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Offside Indicator tell tale not functioning |1.5.2| | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 4 |
| Rear Rear reflector on motorcycle obscured |1.4.1| | 4 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 4 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Registration plate lamp issues | 4 |
| Offside Front Direction indicators not working |1.5.1c| | 4 |
| Rear suspension bush excessively deteriorated |2.4.A2a|i|| | 4 |
| Front Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 4 |
| Nearside Direction indicator not working |1.5.1c| | 4 |
| Headlamp insecure |1.2.3b| | 4 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 4 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 4 |
| Stop lamp remains on when the brakes are released | 4 |
| Headlamp aim not tested |1.6| | 4 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Front Roller brake test indicates a severely juddering brake |3.3.A1b| | 4 |
| Nearside Rear Direction indicator not working |1.5.1c| | 4 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Fuel cap does not fasten securely by a positive means |7.2.2b| | 3 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Offside Front Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Nearside Front position lamp incorrect colour |1.1.2a| | 3 |
| Offside Front position lamp incorrect colour |1.1.2a| | 3 |
| Handlebar deformed |2.1.1b| | 3 |
| Lower Rear suspension bush has excessive free play |2.4.A2a|i|| | 3 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 3 |
| Rear wheel rotation likely to be impeded |6.2.1b| | 3 |
| Rear Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 3 |
| Horn not working |7.7 |a| |ii|| | 3 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 3 |
| Headlamp switch faulty |1.2.4| | 3 |
| Front mudguard insecure |2.3.7| | 3 |
| Offside Rear Direction indicator insecure |1.5.3b| | 3 |
| Exhaust mounting missing |7.1.1c| | 3 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 3 |
| Brake hose damaged | 3 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Front Fairings insecure and likely to impede the steering |2.1.2e| | 3 |
| Front Front mudguard insecure |2.3.7| | 3 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Centre Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Indicator tell tale not functioning |1.5.2| | 3 |
| Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Front Brake lever mounting insecure |3.1.2a| | 3 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 3 |
| Rear position lamp incorrect colour |1.1.2b| | 3 |
| Rear Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 3 |
| Offside Front Direction indicator not working |1.5.1c| | 3 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Fuel system component leaking |7.2.1a| | 3 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 3 |