| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 143 |
| Stop lamp remains on when the brakes are released | 66 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 60 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 47 |
| Rear Brake lever has insufficient reserve travel (1.1.2 (a)) | 40 |
| Front Brake excessively binding (1.2.1 (f)) | 28 |
| Registration plate issues | 26 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 22 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 22 |
| Rear Brake lever has insufficient reserve travel |1.1.2 |a|| | 22 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 21 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 18 |
| Rear Brake excessively binding (1.2.1 (f)) | 18 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 17 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 17 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 15 |
| Rear Brake effort inadequate at a wheel (1.2.1 (a) (i)) | 14 |
| Registration plate lamp issues | 14 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 13 |
| Front brake disc in such a condition that it is seriously weakened | 12 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 12 |
| Stop lamp not working (4.3.1 (a) (ii)) | 12 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 11 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 11 |
| Front Brake disc significantly and obviously worn |1.1.14 |a| |i|| | 10 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Rear Brake lining(s) less than 1.0 mm thick (1.1.13 (a)) | 9 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 8 |
| Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 8 |
| Front Brake excessively binding |1.2.1 |f|| | 8 |
| Steering headbearing in such a condition that steering control is adversely affected |2.2.2 |f| |ii|| | 7 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 7 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 6 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 6 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 6 |
| Horn not working (7.7 (a)) | 6 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 6 |
| Nearside Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 5 |
| Nearside Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Nearside Front Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 5 |
| Front Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 5 |
| Rear Wheel bearing rough when rotated (5.1.3 (b) (i)) | 5 |
| Front Brake fluid reservoir fluid level significantly below minimum level (1.1.10 (d) (ii)) | 5 |
| Offside Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Rear Brake lining|s| less than 1.0 mm thick |1.1.13 |a|| | 5 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 5 |
| Rear Brake drum significantly and obviously worn (1.1.14 (a) (i)) | 4 |
| Offside Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 4 |
| Front Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 4 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Offside Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Front Brake lever is bent and the brake cannot be readily applied (1.1.2 (d)) | 4 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 4 |
| Rear Brake lagging in operation (1.2.1 (d)) | 4 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Front Valve stem seriously damaged |5.2.3 |j|| | 4 |
| Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Rear Brake excessively binding |1.2.1 |f|| | 4 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 4 |
| Front Brake grabbing severely (1.2.1 (c)) | 4 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Steering headbearing in such a condition that steering control is adversely affected (2.2.2 (f) (ii)) | 4 |
| Riders seat insecure (6.2.5 (a) (ii)) | 3 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 3 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Front Brake disc contaminated (1.1.14 (b)) | 3 |
| Horn not working |7.7 |a| |ii|| | 3 |
| Riders seat insecure |6.2.5 |a| |ii|| | 3 |
| Headlamp aim not tested (4.1.2 (b)) | 3 |
| Offside Rear Direction indicator not working |4.4.1 |a| |ii|| | 3 |
| Indicator switch inoperative (4.4.2 (a) (ii)) | 3 |
| Rear Stop lamp not working front lever (4.3.1 (a) (ii)) | 3 |
| Nearside Brake lever has insufficient reserve travel |1.1.2 |a|| | 3 |
| Front Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 3 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Rear Brake lever is bent and the brake cannot be readily applied (1.1.2 (d)) | 3 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 3 |
| Front Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 3 |
| Rear Shock absorber has negligible damping effect |5.3.2 |b|| | 3 |
| Front Stop lamp not working control |4.3.1 |a| |ii|| | 3 |
| All direction indicators not working (4.4.1 (a) (ii)) | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 3 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 3 |
| Steering operation impeded by a fairing |2.1.4 |e|| | 3 |