| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 62 |
| Drive chain excessively loose |6.2.1d| | 35 |
| Registration plate issues | 20 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 13 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 11 |
| Drive chain worn to excess |6.2.1e| | 10 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 10 |
| Drive chain excessively tight |6.2.1d| | 9 |
| Front wheel bearings are excessively rough |2.3.5b| | 9 |
| Rear reflector on motorcycle missing |1.4.1| | 9 |
| Rear reflector missing (4.8.2 (a) (ii)) | 8 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 7 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 7 |
| Horn not working |1.7.3a| | 6 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 6 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Rear reflector on motorcycle obscured |1.4.1| | 5 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 5 |
| Handlebar deformed |2.1.1b| | 5 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 4 |
| Rear Position lamp not working (4.2.1 (a)) | 4 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 4 |
| Rear Drive chain excessively loose |6.2.1d| | 4 |
| Steering headbearing has excessive free play |2.2.2| | 4 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Drive chain excessively loose (6.2.1d) | 4 |
| Stop lamp remains on when the brakes are released | 4 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 4 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 4 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 3 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Front wheel bearings have excessive free play |2.3.5b| | 3 |
| Headlamp insecure |1.2.3b| | 3 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 3 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 3 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 3 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Offside Lower Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Rear Rear suspension movement is excessively stiff |2.4.A.3b| | 3 |
| Front Brake fluid contaminated (1.8 (a)) | 2 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 2 |
| 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)) | 2 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 2 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 2 |
| Rear Drive chain worn to excess |6.2.1e| | 2 |
| Nearside Rear Footrest missing |6.2.1a| | 2 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Nearside Rear Direction indicator not working |1.5.1c| | 2 |
| Nearside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Front Wheel spoke excessively loose (4.2.1b) | 2 |
| Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Nearside Rear Direction indicators not working |1.5.1c| | 2 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 2 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Chain guard insecure |6.2.1c| | 2 |
| Horn not working |7.7 |a| |ii|| | 2 |
| Nearside Front Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 2 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 2 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 2 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 2 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Rear Stop lamp does not illuminate immediately a brake applies (1.3.1a) | 2 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Rear Brake excessively binding (1.2.1 (f)) | 2 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Front wheel bearings have excessive free play (2.3.5b) | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Horn not working (1.7.3a) | 2 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 2 |