| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 42 |
| Registration plate lamp issues | 38 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 36 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 32 |
| Front Brake excessively binding (1.2.1 (f)) | 29 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 23 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 23 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 20 |
| Rear reflector missing (4.8.2 (a) (ii)) | 20 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 15 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 13 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 13 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 11 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 11 |
| Rear Brake excessively binding (1.2.1 (f)) | 10 |
| Registration plate issues | 9 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 9 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 9 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 8 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 8 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 8 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 7 |
| Horn not working (7.7 (a)) | 7 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 7 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 7 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 6 |
| Nearside Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 6 |
| Front Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 5 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 5 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 5 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 4 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 4 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 4 |
| Brake pedal has insufficient reserve travel (1.1.2 (a)) | 4 |
| Rear Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 4 |
| Headlamp aim not tested (4.1.2 (b)) | 3 |
| Offside Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Rear Suspension arm pin or bush excessively worn (5.3.4 (a) (i)) | 3 |
| Rear Drive chain sprocket excessively loose (6.1.7 (c) (i)) | 3 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 3 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Stop lamp remains on when the brakes are released | 3 |
| Exhaust system insecure (6.1.2 (a)) | 3 |
| Headlamp aim unable to be tested (4.1.2 (b)) | 3 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 3 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 3 |
| Riders seat insecure (6.2.5 (a) (ii)) | 3 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 3 |
| Front Stop lamp emits other than a steady red light (4.3.3 (a) (ii)) | 3 |
| Front Brake disc contaminated (1.1.14 (b)) | 3 |
| Offside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 3 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 2 |
| Central Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Rear Drive chain sprocket so worn it is likely to fail (6.1.7 (c) (ii)) | 2 |
| Rear Brake pedal anti-slip provision missing (1.1.2 (c)) | 2 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Horn not working (7.7 (a) (ii)) | 2 |
| Rear Footrest missing (6.2.12 (a)) | 2 |
| Front Brake disc fractured (1.1.14 (a) (ii)) | 2 |
| Stop lamp not working foot (4.3.1 (a) (ii)) | 2 |
| Roller brake test Neither brake control achieves an efficiency of 25% (1.2.2 (a) (i)) | 2 |
| Rear Position lamp not working (4.2.1 (a)) | 2 |
| Drive chain horseshoe locking device likely to become detached (6.1.7 (j) (ii)) | 2 |
| Central Rear Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Front Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 2 |
| Rear Brake effort inadequate at a wheel (1.2.1 (a) (i)) | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Nearside Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 2 |
| Front Brake grabbing severely (1.2.1 (c)) | 2 |
| Exhaust has a major leak of exhaust gases at cylinder head (6.1.2 (a)) | 2 |
| Rear Brake pedal not releasing correctly and functionality of brakes affected (1.1.2 (b) (ii)) | 2 |
| Rear Suspension component pin or bush excessively worn (5.3.4 (a) (i)) | 2 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Front Brake master cylinder leaking (1.1.10 (b) (ii)) | 2 |
| 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)) | 2 |
| Front Position lamp not working (4.2.1 (a)) | 2 |
| Brake indicates excessive fluctuation of brake effort front & rear (1.2.1 (e)) | 2 |
| Rear Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 2 |
| Nearside Drive chain excessively loose (6.1.7 (c) (i)) | 2 |
| Rear Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 2 |
| Rear Wheel more than one fixing loose (5.2.1 (a) (ii)) | 2 |
| Front Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Nearside Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 2 |