| Most common failures | No# failures |
|---|
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 138 |
| Headlamp aim out of alignment | 125 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 94 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 90 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 77 |
| Registration plate issues | 70 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 58 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 46 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 44 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 44 |
| Rear reflector on motorcycle missing |1.4.1| | 29 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 29 |
| Headlamp insecure |1.2.3b| | 26 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 23 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 22 |
| Stop lamp remains on when the brake is released |1.3.1e| | 22 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 19 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 19 |
| Horn not working |1.7.3a| | 19 |
| Steering headbearing has excessive free play |2.2.2| | 18 |
| Throttle operating incorrectly |6.2.1f| | 18 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 17 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 17 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 16 |
| 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| | 16 |
| Direction indicators not working |1.5.1c| | 15 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 14 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 13 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 13 |
| Riders seat insecure |6.2.1a| | 13 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 12 |
| Headlamp aim not tested |1.6| | 11 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 11 |
| Rear Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 11 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 10 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 10 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 10 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 10 |
| Front position lamp incorrect colour |1.1.2a| | 10 |
| Offside Front Direction indicator not working |1.5.1c| | 9 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 9 |
| Front Fairings insecure and likely to impede the steering |2.1.2e| | 8 |
| Rear position lamp incorrect colour |1.1.2b| | 8 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 8 |
| Front wheel bearings have excessive free play |2.3.5b| | 8 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 8 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 8 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 7 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 7 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 7 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 7 |
| Front mudguard insecure |2.3.7| | 6 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 6 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 6 |
| Nearside Front Direction indicator not working |1.5.1c| | 6 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 6 |
| Front wheel bearings are excessively rough |2.3.5b| | 6 |
| Rear Brake locking device missing |3.2.A1e| | 6 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 6 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 5 |
| Handlebar deformed |2.1.1b| | 5 |
| Indicator switch defective |1.5.4| | 5 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Rear Stop lamp does not emit a steady light |1.3.1b| | 5 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 5 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 5 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Nearside Rear Direction indicator not working |1.5.1c| | 5 |
| Front Direction indicator incorrect colour |1.5.1b| | 5 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 5 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 5 |
| Offside Front Direction indicators not working |1.5.1c| | 5 |
| Rear Stop lamp emits other than a steady red light |1.3.1b| | 4 |
| Horn control defective |1.7.2a| | 4 |
| Rear Shock absorber has negligible damping effect |5.3.2 |b|| | 4 |
| Stop lamp emits other than a steady red light |1.3.1b| | 4 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 4 |
| Nearside Rear Direction indicators not working |1.5.1c| | 4 |
| Nearside Front Direction indicators not working |1.5.1c| | 4 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 4 |
| Front Brake locking device missing |3.2.A1e| | 4 |
| Indicator tell tale not functioning |1.5.2| | 4 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 4 |
| Offside Rear Direction indicator not working |1.5.1c| | 4 |
| Offside Front Direction indicator missing |1.5.1a| | 4 |
| Rear wheel has a loose wheel nut|s| |4.2.3a| | 4 |
| Rear Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 4 |
| Front Stop lamp does not emit a steady light |1.3.1b| | 4 |
| Nearside Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Offside Rear Direction indicators not working |1.5.1c| | 4 |
| Rear position lamp deteriorated and function impaired |1.1.1b| | 4 |
| Rear Position lamp not working (4.2.1 (a)) | 4 |
| Registration plate lamp issues | 4 |
| Front Stop lamp does not illuminate immediately a brake applies (1.3.1a) | 4 |
| Front position lamp damaged and function impaired |1.1.1b| | 3 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Direction indicator affected by the operation of another lamp |1.5.1c| | 3 |
| Rear Direction indicators affected by the operation of another lamp |1.5.1c| | 3 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Front Direction indicators not working |1.5.1c| | 3 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 3 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 3 |
| Front Brake caliper|s| securing bolt|s| loose |3.2.A1j| | 3 |
| Front Brake disc|s| excessively scored |3.2.A1l| | 3 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 3 |
| Exhaust mounting missing |7.1.1c| | 3 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 3 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 3 |
| Rear wheel insecure |4.2.3b| | 3 |
| Rear position lamp insecure |1.1.1c| | 3 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Headlamp deteriorated and function impaired |1.2.3a| | 3 |
| Front Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 3 |
| Front Direction indicator not working |1.5.1c| | 3 |
| Rear Direction indicator incorrect colour |1.5.1b| | 3 |
| Front Brake caliper|s| insecure |3.2.A1j| | 3 |
| Dipswitch does not deflect the main beam/s, making them into dipped beam/s |1.2.2b|ii|| | 3 |
| Front Front position lamp incorrect colour |1.1.2a| | 3 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Horn not working (1.7.3a) | 3 |
| Nearside Front shock absorber seal failed and leaking oil (2.3.3) | 3 |
| Throttle operating incorrectly (6.2.1f) | 3 |