| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 319 |
| Rear reflector missing (4.8.2 (a) (ii)) | 295 |
| Registration plate lamp issues | 207 |
| Stop lamp remains on when the brakes are released | 144 |
| Registration plate issues | 127 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 86 |
| Rear reflector missing |4.8.2 |a| |ii|| | 76 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 65 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 53 |
| 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)) | 48 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 45 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 44 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 32 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 32 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 30 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 29 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 27 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 26 |
| Rear Footrest missing (6.2.12 (a)) | 26 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 23 |
| Front Brake excessively binding (1.2.1 (f)) | 22 |
| Offside Rear Footrest missing (6.2.12 (a)) | 21 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 21 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 21 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 19 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 18 |
| Horn not working (7.7 (a) (ii)) | 16 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 16 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 15 |
| Rear Brake excessively binding (1.2.1 (f)) | 15 |
| Rear Brake pedal not releasing correctly and functionality of brakes affected (1.1.2 (b) (ii)) | 14 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 13 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 13 |
| Headlamp aim not tested (4.1.2 (b)) | 12 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 12 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 12 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 12 |
| Horn not working (7.7 (a)) | 12 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 11 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 11 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 11 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 11 |
| Stop lamp not working (4.3.1 (a) (ii)) | 11 |
| Offside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 11 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 10 |
| 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|| | 9 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 9 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 9 |
| Front Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 9 |
| Rear Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 9 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 9 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 9 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 8 |
| Offside Front Footrest insecure (6.2.12 (a)) | 8 |
| Fuel cap ineffective (6.1.3 (b) (i)) | 8 |
| Nearside Front Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 8 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 7 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 7 |
| Rear Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 7 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 7 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 7 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 7 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 6 |
| Headlamp aim not tested |4.1.2 |b|| | 6 |
| Horn not working |7.7 |a| |ii|| | 6 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 6 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 6 |
| Rear Wheel spindle loose (5.2.1 (c) (i)) | 6 |
| Front Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 6 |
| All direction indicators not working (4.4.1 (a) (ii)) | 6 |
| Riders seat insecure (6.2.5 (a) (ii)) | 6 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 6 |