| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 171 |
| Rear reflector missing (4.8.2 (a) (ii)) | 102 |
| Registration plate lamp issues | 101 |
| Registration plate issues | 101 |
| Rear reflector missing |4.8.2 |a| |ii|| | 48 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 33 |
| Horn not working (7.7 (a)) | 29 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 23 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 21 |
| 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)) | 19 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 19 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 16 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 15 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 11 |
| Stop lamp remains on when the brakes are released | 10 |
| Horn not working (7.7 (a) (ii)) | 10 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 10 |
| Rear reflector on motorcycle missing |1.4.1| | 9 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 9 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 9 |
| Nearside Front Position lamp not working (4.2.1 (a)) | 9 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 7 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 7 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 7 |
| Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 7 |
| Offside Front Position lamp not working (4.2.1 (a)) | 7 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 6 |
| Horn not working |7.7 |a| |ii|| | 5 |
| Front Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 5 |
| Central Rear Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 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 |
| Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 5 |
| Rear Brake excessively binding (1.2.1 (f)) | 5 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 5 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 4 |
| Rear Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 4 |
| Central Rear Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 4 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 3 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 3 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 3 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 3 |
| Exhaust markings indicating not for road use or similar wording (6.1.2 (c)) | 3 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 3 |
| Nearside Front Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 3 |
| Front Position lamp not working (4.2.1 (a)) | 3 |
| Riders seat insecure (6.2.5 (a) (ii)) | 3 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |
| Central Rear Upper Rear reflector missing (4.8.2 (a) (ii)) | 3 |