| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 73 |
| Rear reflector missing (4.8.2 (a) (ii)) | 65 |
| Registration plate issues | 49 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 18 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 18 |
| Registration plate lamp issues | 14 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 13 |
| Horn not working (7.7 (a)) | 13 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 11 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 11 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 10 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 10 |
| Rear Position lamp not working (4.2.1 (a)) | 8 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 8 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 6 |
| Front Brake excessively binding (1.2.1 (f)) | 6 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 5 |
| Stop lamp remains on when the brakes are released | 5 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 5 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 5 |
| Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Rear Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 5 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 5 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 4 |
| Exhaust markings indicating not for road use or similar wording (6.1.2 (c)) | 4 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 4 |
| Rear Wheel spoke excessively loose (5.2.2 (d)) | 4 |
| Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 4 |
| Offside Front Brake disc contaminated (1.1.14 (b)) | 4 |
| Central Rear Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Front Brake fluid contaminated (1.8 (a)) | 3 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 3 |
| Rear Drive chain worn to excess (6.1.7 (c) (i)) | 3 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |
| Rear Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 3 |
| Nearside Front Brake disc contaminated (1.1.14 (b)) | 2 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 2 |
| Nearside Front Position lamp not working (4.2.1 (a)) | 2 |
| Nearside Front Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 2 |
| Steering operation linkage fouling when handlebars turned from lock to lock (2.1.4 (a)) | 2 |
| Rear Brake fluid contaminated (1.8 (a)) | 2 |
| Central Rear Upper Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Rear Direction indicator obviously incorrectly positioned (4.4.3 (a)) | 2 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 2 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 2 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Front Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Roller brake test Neither brake control achieves an efficiency of 25% (1.2.2 (a) (i)) | 2 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 2 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Rear All direction indicators not working (4.4.1 (a) (ii)) | 2 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected (6.2.7 (a) (ii)) | 2 |