| Most common failures | No# failures |
|---|
| Rear reflector on motorcycle missing |1.4.1| | 96 |
| Headlamp aim out of alignment | 95 |
| Registration plate issues | 55 |
| Horn not working |1.7.3a| | 32 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 29 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 25 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 21 |
| Drive chain excessively loose |6.2.1d| | 21 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 21 |
| Front wheel bearings have excessive free play |2.3.5b| | 15 |
| Rear reflector missing (4.8.2 (a) (ii)) | 14 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 14 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 13 |
| Rear Hydraulic brake control feels spongy |3.1.4a| | 12 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 11 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 11 |
| Riders seat insecure |6.2.1a| | 10 |
| Headlamp aim beam image kick up to the offside |1.6| | 10 |
| Steering headbearing has excessive free play |2.2.2| | 10 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 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 |
| Front wheel bearings are excessively rough |2.3.5b| | 8 |
| Handlebar deformed |2.1.1b| | 8 |
| Drive chain excessively tight |6.2.1d| | 8 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 8 |
| Drive chain worn to excess |6.2.1e| | 7 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 7 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 7 |
| Throttle operating incorrectly |6.2.1f| | 7 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 6 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 6 |
| Offside Rear Footrest missing |6.2.1a| | 6 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 6 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 5 |
| Nearside Rear Footrest missing |6.2.1a| | 5 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 5 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 5 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Horn not working (7.7 (a)) | 5 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 5 |
| Headlamp aim not tested |1.6| | 5 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 5 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 4 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 4 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 4 |
| Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Stop lamp remains on when the brakes are released | 4 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Headlamp insecure |1.2.3b| | 3 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |
| All direction indicators not working (4.4.1 (a) (ii)) | 3 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 3 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Front Horn not working |1.7.3a| | 3 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Brake hose damaged | 3 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 3 |
| Rear Brake has no recorded effort at a wheel (1.2.1 (a) (ii)) | 3 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 3 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 3 |