| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 47 |
| Rear Position lamp not working (4.2.1 (a)) | 19 |
| Drive chain worn to excess |6.2.1e| | 15 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 12 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 12 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 11 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 10 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 10 |
| Rear reflector missing (4.8.2 (a) (ii)) | 9 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 9 |
| Rear Footrest missing (6.2.12 (a)) | 9 |
| Rear Position lamp not working |4.2.1 |a|| | 9 |
| Stop lamp remains on when the brakes are released | 9 |
| Front Position lamp not working (4.2.1 (a)) | 8 |
| Rear reflector missing |4.8.2 |a| |ii|| | 8 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 8 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 8 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 8 |
| Rear reflector on motorcycle missing |1.4.1| | 8 |
| Nearside Rear Footrest missing |6.2.1a| | 7 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 7 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 7 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 7 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 7 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 6 |
| Drive chain excessively loose |6.2.1d| | 6 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 6 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 6 |
| Rear Footrest missing |6.2.1a| | 6 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 5 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 5 |
| Registration plate lamp issues | 5 |
| Rear Shock absorber has negligible damping effect |5.3.2 |b|| | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 5 |
| Registration plate issues | 5 |
| Front Brake disc insecure |1.1.14 |a| |ii|| | 5 |
| Drive chain excessively tight |6.2.1d| | 5 |
| Rear Drive chain sprocket excessively loose (6.1.7 (c) (i)) | 5 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 5 |
| Offside Rear Footrest missing |6.2.1a| | 4 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 4 |
| Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Headlamp insecure |4.1.1 |c|| | 4 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Riders seat insecure (6.2.5 (a) (ii)) | 4 |
| Offside Rear Footrest missing (6.2.12 (a)) | 4 |
| Rear Suspension arm pin or bush excessively worn swing arm (5.3.4 (a) (i)) | 4 |
| Nearside Rear Direction indicators not working |1.5.1c| | 4 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Rear Valve stem seriously damaged |5.2.3 |j|| | 4 |
| Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 4 |
| Horn not working |1.7.3a| | 4 |
| Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 3 |
| Front Brake lever has insufficient reserve travel |1.1.2 |a|| | 3 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Headlamp aim not tested (4.1.2 (b)) | 3 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 3 |
| Drive chain so worn it is likely to fail |6.1.7 |c| |ii|| | 3 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 3 |
| Offside Rear Footrest missing |6.2.12 |a|| | 3 |
| Suspension arm corroded and seriously weakened (5.3.3 (b) (i)) | 3 |
| Rear Brake pedal is bent and the brake cannot be readily applied |1.1.2 |d|| | 3 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Wheel alignment incorrect which adversely affects the steering |2.4 |a|| | 3 |
| Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 3 |
| Rear Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 3 |
| Rear Suspension arm pin or bush excessively worn (5.3.4 (a) (i)) | 3 |
| Nearside Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |
| Wheel alignment incorrect which adversely affects the steering (2.4 (a)) | 3 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Rear Footrest missing |6.2.12 |a|| | 3 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 3 |
| Horn sound not in accordance with requirements (7.7 (c)) | 2 |
| Drive chain excessively tight |6.1.7 |k| |i|| | 2 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 2 |
| Nearside Rear Direction indicator with a multiple light source more than 1/2 not functioning (4.4.1 (a) (ii)) | 2 |
| Wheel alignment incorrect which adversely affects the handling |2.4 |a|| | 2 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 2 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 2 |
| Headlamp light intensity severely reduced (4.1.4 (a)) | 2 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Rear suspension bush has excessive free play swinging arm |2.4.A2a|i|| | 2 |
| Rear Brake pedal is positioned so that the brake cannot be readily applied |3.1.3c| | 2 |
| Engine mounting/bracket excessively loose (6.1.8 (a) (ii)) | 2 |
| Rear Suspension arm pin or bush excessively worn |5.3.4 |a| |i|| | 2 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 2 |
| All position lamps not working (4.2.1 (a)) | 2 |
| Rear reflector on motorcycle obscured |1.4.2b| | 2 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Nearside Rear Direction indicator not working |1.5.1c| | 2 |
| Drive chain sprocket worn to excess |6.1.7 |c| |i|| | 2 |
| Exhaust silencer insecure |8.1.1 |b| |i|| | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 2 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Front Direction indicator obviously incorrectly positioned (4.4.3 (a)) | 2 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Front Brake disc|s| insecure |3.2.A1g| | 2 |
| Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 2 |
| Rear Brake lagging in operation (1.2.1 (d)) | 2 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling (2.4 (a)) | 2 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 2 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 2 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 2 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 2 |
| All direction indicators not working |4.4.1 |a| |ii|| | 2 |
| Front mudguard insecure |2.3.7| | 2 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Nearside Rear Footrest missing |6.2.12 |a|| | 2 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Rear Brake pedal has insufficient reserve travel |1.1.2 |a|| | 2 |
| Shock absorber has negligible damping effect both (5.3.2 (b)) | 2 |
| Offside Rear Direction indicator not working |1.5.1c| | 2 |
| All direction indicators not working (4.4.1 (a) (ii)) | 2 |
| Offside Rear Footrest insecure |6.2.12 |a|| | 2 |
| Nearside Rear Drive chain excessively loose (6.1.7 (c) (i)) | 2 |
| Nearside Rear Drive chain worn to excess (6.1.7 (c) (i)) | 2 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Central Front Position lamp not working (4.2.1 (a)) | 2 |
| Nearside Rear Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 2 |
| Nearside Rear Footrest insecure |6.2.12 |a|| | 2 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 2 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 2 |
| Nearside Front Brake disc insecure (1.1.14 (a) (ii)) | 2 |
| Rear reflector defective or damaged by more than 50% of the reflecting surface |4.8.1 |a| |ii|| | 2 |
| Nearside Rear Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 2 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 2 |