| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 152 |
| Registration plate issues | 110 |
| Rear reflector on motorcycle missing |1.4.1| | 94 |
| Registration plate lamp issues | 42 |
| Drive chain excessively loose |6.2.1d| | 34 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 27 |
| Rear reflector missing (4.8.2 (a) (ii)) | 27 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 23 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 23 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 22 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 22 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 20 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 18 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 16 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Horn not working |1.7.3a| | 14 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 13 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 13 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 13 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 13 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 12 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 12 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 12 |
| 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| | 11 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 11 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 11 |
| Front Brake excessively binding (1.2.1 (f)) | 11 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 10 |
| Horn not working (7.7 (a)) | 10 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 9 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 9 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 9 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 9 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 8 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 8 |
| Rear reflector missing |4.8.2 |a| |ii|| | 8 |
| Drive chain excessively tight |6.2.1d| | 8 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Horn sounds harsh or grating |1.7.3c| | 8 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 7 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 7 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 7 |
| Nearside Rear Direction indicator not working |1.5.1c| | 7 |
| Throttle operating incorrectly |6.2.1f| | 7 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Steering headbearing has excessive free play |2.2.2| | 6 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 5 |
| Stop lamp remains on when the brakes are released | 5 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 5 |
| Horn not working (7.7 (a) (ii)) | 5 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 5 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 5 |
| 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|| | 5 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 4 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 4 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 4 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 4 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Direction indicators not working |1.5.1c| | 4 |
| Headlamp aim not tested (4.1.2 (b)) | 4 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected (6.2.7 (a) (ii)) | 4 |
| Handlebar deformed |2.1.1b| | 4 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 4 |
| All direction indicators not working (4.4.1 (a) (ii)) | 4 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 4 |