| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 158 |
| Stop lamp remains on when the brakes are released | 125 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 100 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 96 |
| Rear Brake lever has insufficient reserve travel (1.1.2 (a)) | 59 |
| Front Brake excessively binding (1.2.1 (f)) | 50 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 42 |
| Registration plate issues | 36 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 34 |
| Registration plate lamp issues | 26 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 22 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 22 |
| Rear Brake effort inadequate at a wheel (1.2.1 (a) (i)) | 21 |
| Riders seat insecure (6.2.5 (a) (ii)) | 18 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 18 |
| Horn not working (7.7 (a)) | 17 |
| Rear Brake lining(s) less than 1.0 mm thick (1.1.13 (a)) | 17 |
| Rear Brake excessively binding (1.2.1 (f)) | 16 |
| Nearside Brake lever has insufficient reserve travel (1.1.2 (a)) | 15 |
| Front Brake grabbing severely (1.2.1 (c)) | 14 |
| Front brake disc in such a condition that it is seriously weakened | 14 |
| Front Steering operation restricted in free movement from lock to lock (2.1.4 (c)) | 11 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 11 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 11 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 10 |
| Stop lamp not working (4.3.1 (a) (ii)) | 10 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 10 |
| Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 9 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 9 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 9 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 9 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 9 |
| Nearside Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 9 |
| Rear Brake lagging in operation (1.2.1 (d)) | 9 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 9 |
| Headlamp insecure (4.1.1 (c)) | 8 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 7 |
| Rear Brake drum significantly and obviously worn (1.1.14 (a) (i)) | 7 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 7 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 6 |
| Front Shock absorber has negligible damping effect (5.3.2 (b)) | 6 |
| Rear Brake drum in such a condition that it is seriously weakened (1.1.14 (a) (ii)) | 6 |
| Offside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 6 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 5 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 5 |
| Brake performance unable to be tested (1.2.1 (g)) | 5 |
| Nearside Front Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 5 |
| Brake lever has insufficient reserve travel (1.1.2 (a)) | 5 |
| Rear reflector missing (4.8.2 (a) (ii)) | 5 |
| Nearside Brake lever is bent and the brake cannot be readily applied (1.1.2 (d)) | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Front Brake disc contaminated (1.1.14 (b)) | 5 |
| Rear Wheel bearing so rough it is likely to overheat or break up (5.1.3 (b) (ii)) | 4 |
| Front Headlamp insecure (4.1.1 (c)) | 4 |
| Front Brake fluid contaminated (1.8 (a)) | 4 |
| Front Position lamp not working (4.2.1 (a)) | 4 |
| Brake disc fractured (1.1.14 (a) (ii)) | 4 |
| Nearside Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 4 |
| Rear Brake has no recorded effort at a wheel (1.2.1 (a) (ii)) | 4 |
| Steering headbearing in such a condition that steering control is adversely affected (2.2.2 (f) (ii)) | 4 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 4 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Offside Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Riders seat with a defective supporting structure (6.2.5 (a) (i)) | 4 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 4 |
| Fuel cap missing (6.1.3 (b) (i)) | 4 |
| Nearside Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 4 |