| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 52 |
| Rear reflector on motorcycle missing |1.4.1| | 50 |
| Registration plate issues | 31 |
| Horn not working |1.7.3a| | 18 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 17 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 17 |
| Drive chain excessively loose |6.2.1d| | 13 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 13 |
| Front wheel bearings have excessive free play |2.3.5b| | 12 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 10 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Headlamp aim beam image kick up to the offside |1.6| | 7 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 6 |
| Drive chain worn to excess |6.2.1e| | 5 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 5 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 5 |
| Front wheel bearings are excessively rough |2.3.5b| | 4 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 4 |
| 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| | 4 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 3 |
| Throttle operating incorrectly |6.2.1f| | 3 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 3 |
| Drive chain excessively tight |6.2.1d| | 3 |
| Front position lamp incorrect colour |1.1.2a| | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 3 |
| Riders seat insecure |6.2.1a| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Offside Rear Direction indicator not working |1.5.1c| | 3 |
| Headlamp aim not tested |1.6| | 3 |
| Nearside Front Footrest insecure |6.2.1a| | 3 |
| Rear Position lamp not working (4.2.1 (a)) | 3 |
| Rear Brake effort inadequate at a wheel |1.2.1 |a| |i|| | 2 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 2 |
| Nearside Front Indicator switch insecure |1.5.4| | 2 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 2 |
| Stop lamp remains on when the brakes are released | 2 |
| Nearside Front Direction indicator insecure |1.5.3b| | 2 |
| Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Rear Brake pedal has insufficient reserve travel |1.1.2 |a|| | 2 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 2 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Brake pedal pivots excessively worn |3.1.3a| | 2 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 2 |
| Front Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 2 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 2 |
| Offside Front Direction indicator not working |1.5.1c| | 2 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 2 |
| Rear Brake master cylinder fluid level dangerously low |3.2.B1d| | 2 |
| Nearside Rear Direction indicators not working |1.5.1c| | 2 |
| Front Horn not working |1.7.3a| | 2 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Headlamp switch insecure |1.2.4| | 2 |
| Offside Front Direction indicators not working |1.5.1c| | 2 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 2 |
| Nearside Rear Direction indicator not working |1.5.1c| | 2 |
| Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Handlebar deformed |2.1.1b| | 2 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front brake disc in such a condition that it is seriously weakened | 2 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 2 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 2 |
| Nearside Steering lock stop ineffective |2.1.3| | 2 |
| Offside Front Direction indicator insecure |1.5.3b| | 2 |
| Rear reflector on motorcycle does not reflect squarely to the rear |1.4.1| | 2 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 2 |
| Steering headbearing has excessive free play |2.2.2| | 2 |
| Horn sounds harsh or grating |1.7.3c| | 2 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 2 |