| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 151 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 52 |
| Drive chain excessively loose |6.2.1d| | 42 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 21 |
| Drive chain worn to excess |6.2.1e| | 19 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 19 |
| Stop lamp remains on when the brakes are released | 16 |
| Registration plate issues | 13 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 12 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 12 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 11 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 11 |
| Rear Position lamp not working (4.2.1 (a)) | 11 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 11 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 11 |
| Rear Brake excessively binding (1.2.1 (f)) | 10 |
| Drive chain excessively tight |6.2.1d| | 9 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 9 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 9 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 9 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 8 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 8 |
| Drive chain sprocket worn to excess |6.2.1e| | 8 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 8 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 8 |
| Front Position lamp not working (4.2.1 (a)) | 8 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 8 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 7 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 7 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 7 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 7 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 7 |
| Headlamp insecure (4.1.1 (c)) | 7 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 7 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 7 |
| Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 7 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 7 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 6 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 6 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 6 |
| Front Brake excessively binding (1.2.1 (f)) | 6 |
| Handlebar deformed |2.1.1b| | 5 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Steering headbearing has excessive free play |2.2.2| | 5 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Rear Drive chain excessively loose |6.2.1d| | 5 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 5 |
| Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Rear Drive chain worn to excess |6.2.1e| | 5 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Horn not working (7.7 (a) (ii)) | 5 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 5 |
| Horn not working (7.7 (a)) | 5 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 4 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 4 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 4 |
| Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 4 |
| Drive chain so worn it is likely to fail |6.1.7 |c| |ii|| | 4 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Horn not working |1.7.3a| | 4 |
| Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 4 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 4 |
| Dipswitch does not operate immediately when selected on dipped beam (4.1.3 (b)) | 4 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 4 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 3 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 3 |
| Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Headlamp insecure |1.2.3b| | 3 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Offside Front Direction indicator not working |1.5.1c| | 3 |
| Nearside Front Direction indicator not working |4.4.1 |a| |ii|| | 3 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Rear Brake excessively binding |1.2.1 |f|| | 3 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Offside Indicator tell tale not functioning |1.5.2| | 3 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Rear Suspension arm pin or bush excessively worn (5.3.4 (a) (i)) | 3 |
| Headlamp at least one does not illuminate on dipped beam (1.2.2a(i)) | 3 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 3 |
| Rear Wheel bearing rough when rotated (5.1.3 (b) (i)) | 3 |
| Nearside Rear Drive chain excessively loose (6.1.7 (c) (i)) | 3 |
| Registration plate lamp issues | 3 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Brake lever has insufficient reserve travel (1.1.2 (a)) | 3 |