| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 133 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 74 |
| Drive chain excessively loose |6.2.1d| | 70 |
| Registration plate issues | 66 |
| Drive chain worn to excess |6.2.1e| | 54 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 40 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 39 |
| Front wheel bearings are excessively rough |2.3.5b| | 35 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 34 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 33 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 32 |
| Throttle operating incorrectly |6.2.1f| | 31 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 31 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 30 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 30 |
| Horn not working |1.7.3a| | 26 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 26 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 23 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 22 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 21 |
| Handlebar deformed |2.1.1b| | 19 |
| Drive chain excessively tight |6.2.1d| | 19 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 18 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 18 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 18 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 18 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 17 |
| Front wheel bearings have excessive free play |2.3.5b| | 17 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 16 |
| Rear Wheel spoke cracked. |4.2.1b| | 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| | 15 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 12 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 12 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 12 |
| Front Brake excessively binding (1.2.1 (f)) | 12 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 11 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 11 |
| Rear Wheel spoke excessively loose |4.2.1b| | 11 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Exhaust excessively deteriorated |7.1.1a| | 10 |
| Rear Brake excessively binding (1.2.1 (f)) | 10 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 10 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 9 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 9 |
| Rear Drive chain excessively loose |6.2.1d| | 9 |
| Rear Wheel spoke missing |4.2.1b| | 9 |
| Stop lamp remains on when the brakes are released | 9 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 8 |
| Steering headbearing has excessive free play |2.2.2| | 8 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 8 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 7 |
| Front Brake disc contaminated (1.1.14 (b)) | 7 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 7 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 7 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 7 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 7 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 7 |
| Stop lamp remains on when the brake is released |1.3.1e| | 6 |
| Front Position lamp not working (4.2.1 (a)) | 6 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |
| Nearside Rear Direction indicator not working |1.5.1c| | 6 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Offside Rear Direction indicators not working |1.5.1c| | 6 |
| Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 6 |
| Riders seat insecure |6.2.1a| | 6 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 6 |
| Offside Rear Direction indicator not working |1.5.1c| | 6 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 5 |
| Rear Position lamp not working (4.2.1 (a)) | 5 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 5 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 5 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 5 |
| Front Handlebar deformed |2.1.1b| | 5 |
| Rear Brake locking device missing |3.2.A1e| | 5 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 5 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Headlamp aim not tested |1.6| | 5 |
| Direction indicators not working |1.5.1c| | 5 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Rear reflector on motorcycle missing |1.4.1| | 4 |
| Horn not working (7.7 (a)) | 4 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 4 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Headlamp aim beam image kick up to the offside |1.6| | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Front Front mudguard insecure |2.3.7| | 4 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 4 |
| Front Wheel spoke excessively loose |4.2.1b| | 4 |
| Rear Drive chain worn to excess |6.2.1e| | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Front Plate brake test indicates a binding brake |3.3.B1a| | 4 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 4 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 4 |