| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 257 |
| Registration plate issues | 164 |
| Rear reflector missing (4.8.2 (a) (ii)) | 158 |
| Registration plate lamp issues | 121 |
| Rear reflector on motorcycle missing |1.4.1| | 98 |
| Rear reflector missing |4.8.2 |a| |ii|| | 62 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 47 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 35 |
| Stop lamp remains on when the brakes are released | 25 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 22 |
| Headlamp not working on dipped beam (4.1.1 (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)) | 20 |
| Drive chain excessively loose |6.2.1d| | 16 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 16 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 15 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 15 |
| 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|| | 14 |
| Horn not working (7.7 (a) (ii)) | 14 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 14 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 12 |
| Headlamp aim not tested (4.1.2 (b)) | 12 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 12 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 12 |
| Horn not working (7.7 (a)) | 12 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 11 |
| Drive chain worn to excess |6.2.1e| | 11 |
| Front Brake excessively binding (1.2.1 (f)) | 11 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 11 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 11 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 11 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 10 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 10 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 10 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 10 |
| Horn not working |7.7 |a| |ii|| | 9 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 9 |
| Rear Brake excessively binding (1.2.1 (f)) | 9 |
| Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 9 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 9 |
| 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| | 8 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 8 |
| Rear Footrest missing (6.2.12 (a)) | 8 |
| Rear Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 8 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 8 |
| Offside Rear Footrest missing (6.2.12 (a)) | 8 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 7 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 7 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 7 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 7 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 7 |
| Rear Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 7 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 7 |
| Central Rear Rear reflector missing (4.8.2 (a) (ii)) | 7 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 6 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 6 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 6 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 6 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |
| Headlamp insecure (4.1.1 (c)) | 6 |
| Rear Valve stem seriously damaged |5.2.3 |j|| | 5 |
| Offside Rear Footrest missing |6.2.1a| | 5 |
| Horn not working |1.7.3a| | 5 |
| Offside Front Direction indicators not working |1.5.1c| | 5 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Rear Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 5 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 5 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Front Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 5 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 5 |