| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 104 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 67 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 36 |
| Registration plate lamp issues | 33 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 25 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 23 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 22 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 21 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 20 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 19 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 17 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 16 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 16 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 15 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 14 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 13 |
| Front Brake disc contaminated (1.1.14 (b)) | 12 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 11 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 11 |
| Registration plate issues | 11 |
| Stop lamp remains on when the brakes are released | 10 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 10 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 9 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 9 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 9 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 9 |
| Headlamp aim not tested (4.1.2 (b)) | 8 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 8 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 8 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 8 |
| Front Brake excessively binding (1.2.1 (f)) | 7 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 7 |
| Drive chain excessively loose |6.2.1d| | 7 |
| Handlebar deformed to the extent that steering is affected (2.2.1 (c) (ii)) | 6 |
| Handlebar deformed to the extent that steering is affected |2.2.1 |c| |ii|| | 6 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Drive chain so worn it is likely to fail |6.1.7 |c| |ii|| | 6 |
| Front Brake grabbing severely (1.2.1 (c)) | 6 |
| Rear Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 6 |
| Rear Drive chain worn to excess (6.1.7 (c) (i)) | 6 |
| Drive chain horseshoe locking device incorrectly fitted |6.1.7 |j| |i|| | 6 |
| Rear Brake excessively binding (1.2.1 (f)) | 5 |
| Front Brake disc contaminated |1.1.14 |b|| | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 5 |
| Horn not working (7.7 (a) (ii)) | 5 |
| Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 4 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 4 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 4 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 4 |
| Rear Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 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 |
| Central Rear Position lamp not working (4.2.1 (a)) | 4 |
| Nearside Rear Drive chain excessively loose (6.1.7 (c) (i)) | 4 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 4 |
| Wheel alignment incorrect which adversely affects the steering |2.4 |a|| | 4 |
| Rear Wheel bearing has excessive play |5.1.3 |a| |i|| | 4 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 4 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Front Brake lever pivot excessively tight (1.1.1 (a)) | 3 |
| Drive chain excessively tight, so that it is likely to fail |6.1.7 |k| |ii|| | 3 |
| Drive chain worn to excess |6.2.1e| | 3 |
| Front Brake grabbing severely |1.2.1 |c|| | 3 |
| Rear Drive chain worn to excess |6.1.7 |c| |i|| | 3 |
| Drive chain excessively tight |6.1.7 |k| |i|| | 3 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Rear Drive chain sprocket so worn it is likely to fail (6.1.7 (c) (ii)) | 3 |
| Front Wheel bearing so rough it is likely to overheat or break up (5.1.3 (b) (ii)) | 3 |
| Handlebar excessively deformed (2.2.1 (c) (i)) | 3 |
| Headlamp aim not tested |4.1.2 |b|| | 3 |
| Horn sound not in accordance with requirements (7.7 (c)) | 3 |
| Front Position lamp not working (4.2.1 (a)) | 3 |
| Rear Drive chain sprocket excessively loose (6.1.7 (c) (i)) | 3 |
| Nearside Front Direction indicator likely to become detached (4.4.1 (c) (ii)) | 3 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Front Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 3 |
| Front Brake excessively binding |1.2.1 |f|| | 3 |
| Drive chain sprocket so loose it is likely to fail (6.1.7 (c) (ii)) | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 3 |
| Nearside Front Shock absorber has a serious fluid leak fork seal (5.3.2 (b)) | 3 |
| Central Rear Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Front Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 3 |
| Wheel alignment incorrect which adversely affects the handling |2.4 |a|| | 3 |