| Most common failures | No# failures |
|---|
| Registration plate issues | 55 |
| Rear reflector on motorcycle missing |1.4.1| | 51 |
| Headlamp aim out of alignment | 22 |
| Front wheel bearings have excessive free play |2.3.5b| | 18 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 13 |
| Horn not working |1.7.3a| | 12 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 9 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 9 |
| Rear reflector missing |4.8.2 |a| |ii|| | 7 |
| Rear reflector missing (4.8.2 (a) (ii)) | 7 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Drive chain excessively loose |6.2.1d| | 5 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 5 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 4 |
| Horn missing |1.7.1| | 4 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Drive chain excessively tight |6.2.1d| | 3 |
| Registration plate lamp issues | 3 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Drive chain fouling another component |6.2.1d| | 3 |
| Rear Wheel spoke excessively loose |4.2.1b| | 3 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Drive chain worn to excess |6.2.1e| | 3 |
| Fuel system component leaking |7.2.1a| | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 3 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 2 |
| Centre Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 2 |
| Front Stop lamp missing |1.3.3a| | 2 |
| Front Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 2 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 2 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Rear Brake pedal insecure |3.1.2a| | 2 |
| Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Centre Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Front Brake caliper|s| insecure |3.2.A1j| | 2 |
| Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Headlamp aim not tested |1.6| | 2 |
| Horn is not continous or uniform |1.7.3c| | 1 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Nearside Front Direction indicator missing |4.4.1 |a| |ii|| | 1 |
| Offside Front Direction indicator missing |4.4.1 |a| |ii|| | 1 |
| Central Rear Rear reflector missing (4.8.2 (a) (ii)) | 1 |
| Nearside Rear Drive chain horseshoe locking device likely to become detached (6.1.7 (j) (ii)) | 1 |
| Offside Front Footrest insecure |6.2.1a| | 1 |
| Rear Suspension component pin or bush excessively worn (5.3.4 (a) (i)) | 1 |
| Rear Brake excessively binding (1.2.1 (f)) | 1 |
| Centre Front Position lamp switch faulty |1.1.4a| | 1 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 1 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 1 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 1 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 1 |
| Rear Suspension arm pin or bush excessively worn swingarm (5.3.4 (a) (i)) | 1 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 1 |
| Centre Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Steering movement excessively rough with the wheel raised |2.2.1b| | 1 |
| Front Brake disc contaminated (1.1.14 (b)) | 1 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 1 |
| All direction indicators not working (4.4.1 (a) (ii)) | 1 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Rear Brake pedal attachment screws loose |3.1.2b| | 1 |
| Rear Wheel spoke missing |4.2.1b| | 1 |
| Rear Wheel spoke excessively bent |4.2.1b| | 1 |
| Wheel bearing so rough it is likely to overheat or break up (5.1.3 (b) (ii)) | 1 |
| Brake pedal insecure (1.1.2 (e) (i)) | 1 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 1 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 1 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Rear Rear suspension movement is excessively stiff |2.4.A.3b| | 1 |
| Front Wheel bearing play so excessive that directional control is impaired (5.1.3 (a) (ii)) | 1 |
| Outer Front Upper Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 1 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Direction indicator missing all, switch in place |1.5.1a| | 1 |
| Front Dipswitch does not deflect the main beam/s, making them into dipped beam/s |1.2.2b|ii|| | 1 |
| Lower Rear suspension bearing has excessive free play Shock bearing |2.4.A2a|i|| | 1 |
| Rear Brake locking device missing |3.2.A1e| | 1 |
| Stop lamp not working rear brake |4.3.1 |a| |ii|| | 1 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 1 |
| Front Wheel bearing has excessive play |5.1.3 |a| |i|| | 1 |
| Suspension component pin or bush excessively worn |5.3.4 |a| |i|| | 1 |
| Suspension component pin or bush excessively worn s/arm |5.3.4 |a| |i|| | 1 |
| Offside Front Shock absorber has a serious fluid leak fork |5.3.2 |b|| | 1 |
| Front Stop lamp lens defective such that the emitted light is adversely affected (4.3.1 (b) (ii)) | 1 |
| Stop lamp not working front brake (4.3.1 (a) (ii)) | 1 |
| Nearside Front Direction indicator insecure |1.5.3b| | 1 |
| Offside Front Direction indicator insecure |1.5.3b| | 1 |
| Rear Stop lamp missing |1.3.3a| | 1 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Horn not working terminal had come off (7.7 (a)) | 1 |
| Front Wheel bearing so rough it is likely to overheat or break up (5.1.3 (b) (ii)) | 1 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 1 |
| Exhaust markings indicating not for road use or similar wording (6.1.2 (c)) | 1 |
| Headlamp aim so that beam "kick up" is not visible on the screen no image |4.1.2 |a|| | 1 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 1 |
| Stop lamp not working not working of front brake |4.3.1 |a| |ii|| | 1 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 1 |
| Fuel system component leaking from carb |6.1.3 |b| |i|| | 1 |
| Rear Wheel alignment incorrect which adversely affects the handling fouling the chain |2.4 |a|| | 1 |
| Front Horn not working |1.7.3a| | 1 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 1 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Front Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Front Stop lamp not working Off brake lever (4.3.1 (a) (ii)) | 1 |
| Rear Stop lamp not working Off rear brake lever (4.3.1 (a) (ii)) | 1 |
| Rear Wheel spoke excessively loose (5.2.2 (d)) | 1 |
| Centre Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Front Direction indicators flashing more than 120 times per minute |1.5.1c| | 1 |
| Rear Direction indicators not working missing |1.5.1c| | 1 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 1 |
| Headlamp light intensity severely reduced |4.1.4 |a|| | 1 |
| Brake lever not releasing correctly and functionality of brakes affected |1.1.2 |b| |ii|| | 1 |
| Horn not working |7.7 |a| |ii|| | 1 |
| Centre Front Horn missing |1.7.1| | 1 |
| Centre Rear Stop lamp missing |1.3.3a| | 1 |
| Centre Rear Rear reflector on sidecar missing |1.4.1| | 1 |
| Front Wheel excessively distorted (5.2.2 (c) (i)) | 1 |
| Fuel system component leaking excessively or a risk of fire (6.1.3 (b) (ii)) | 1 |
| Front Brake excessively binding (1.2.1 (f)) | 1 |
| Front Horn missing |1.7.1| | 1 |
| Front Valve stem seriously misaligned (5.2.3 (j)) | 1 |
| Front Position lamp not working (4.2.1 (a)) | 1 |
| Stop lamp not working |4.3.1 |a| |ii|| | 1 |
| Front Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 1 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 1 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 1 |
| Rear Position lamp not working (4.2.1 (a)) | 1 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 1 |
| Rear position lamp incorrect colour |1.1.2b| | 1 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 1 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 1 |
| Rear Brake disc|s| is excessively distorted |3.2.A1m| | 1 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 1 |
| Fuel cap ineffective (6.1.3 (b) (i)) | 1 |
| Front Wheel spoke excessively loose |4.2.1b| | 1 |
| Front position lamp damaged and function impaired |1.1.1b| | 1 |
| Offside Front Brake lever has inadequate reserve travel |3.1.3b| | 1 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 1 |
| Horn not working missing (7.7 (a) (ii)) | 1 |
| Indicator tell tale not functioning |1.5.2| | 1 |
| Horn replaced by a siren |1.7.3b| | 1 |