| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 120 |
| Registration plate issues | 55 |
| Rear Position lamp not working (4.2.1 (a)) | 34 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 32 |
| Registration plate lamp issues | 23 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 22 |
| Front Brake excessively binding (1.2.1 (f)) | 20 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 17 |
| Stop lamp remains on when the brakes are released | 14 |
| Rear reflector missing (4.8.2 (a) (ii)) | 14 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 12 |
| Rear Brake lever has insufficient reserve travel (1.1.2 (a)) | 12 |
| Stop lamp not working (4.3.1 (a) (ii)) | 11 |
| Offside Rear Direction indicator not working |4.4.1 |a| |ii|| | 9 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 9 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 8 |
| Rear Wheel fixing loose (single fixing) (5.2.1 (a) (ii)) | 7 |
| Horn not working (7.7 (a) (ii)) | 7 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 7 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 7 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 7 |
| Nearside Rear Direction indicator not working |4.4.1 |a| |ii|| | 6 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 6 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 6 |
| 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)) | 6 |
| Horn not working (7.7 (a)) | 6 |
| Rear Position lamp not working |4.2.1 |a|| | 5 |
| Engine mounting/bracket damaged or deteriorated resulting in excessive movement (6.1.8 (a) (i)) | 5 |
| Front Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 5 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 5 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 4 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 4 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 4 |
| Rear Brake drum in such a condition that it is seriously weakened (1.1.14 (a) (ii)) | 4 |
| Front Position lamp not working (4.2.1 (a)) | 4 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Rear Brake effort inadequate at a wheel (1.2.1 (a) (i)) | 4 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 4 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 4 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 3 |
| Headlamp aim not tested |4.1.2 |b|| | 3 |
| Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 3 |
| Steering headbearing excessively stiff or notchy excessively notchy (2.2.2 (f) (i)) | 3 |
| Position lamp showing white light to the rear (4.2.3 (a) (ii)) | 3 |
| Rear Brake excessively binding (1.2.1 (f)) | 3 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| All direction indicators not working (4.4.1 (a) (ii)) | 3 |
| Riders seat insecure (6.2.5 (a) (ii)) | 3 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 2 |
| Front Brake excessively binding |1.2.1 |f|| | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 2 |
| Front Wheel bearing rough when rotated |5.1.3 |b| |i|| | 2 |
| Front Brake disc significantly and obviously worn |1.1.14 |a| |i|| | 2 |
| Central Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 2 |
| Front Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 2 |
| Wheel alignment incorrect which adversely affects the handling |2.4 |a|| | 2 |
| Rear Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Offside Rear All direction indicators not working (4.4.1 (a) (ii)) | 2 |
| Rear Brake pedal pivot excessively tight (1.1.1 (a)) | 2 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 2 |
| Front Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 2 |
| Front Brake lever is bent and the brake cannot be readily applied (1.1.2 (d)) | 2 |
| Fuel cap missing (6.1.3 (b) (i)) | 2 |
| Rear Wheel spindle or securing nut(s) so insecure that wheel security or steering control is adversely affected (5.2.1 (c) (ii)) | 2 |
| Rear Position lamp switch does not illuminate all position lamps with a single operation (4.2.2 (a)) | 2 |
| Front Shock absorber has negligible damping effect (5.3.2 (b)) | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 2 |
| Headlamp insecure (4.1.1 (c)) | 2 |
| Rear Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 2 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 2 |
| Rear All position lamps not working (4.2.1 (a)) | 2 |
| Horn sound not in accordance with requirements (7.7 (c)) | 2 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 2 |
| Fuel cap ineffective (6.1.3 (b) (i)) | 2 |
| Front Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Rear Brake pedal not releasing correctly and functionality of brakes affected (1.1.2 (b) (ii)) | 2 |
| Offside Front Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Rear Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 2 |
| Headlamp aim not tested (4.1.2 (b)) | 2 |
| Rear Stop lamp emits other than a steady red light (4.3.3 (a) (ii)) | 2 |
| Nearside Brake lever has insufficient reserve travel (1.1.2 (a)) | 2 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 2 |
| All direction indicators adversely affected by the operation of another lamp (4.4.3 (b)) | 2 |