| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 17 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 7 |
| Steering headbearing has excessive free play |2.2.2| | 6 |
| Horn not working |1.7.3a| | 6 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Rear Direction indicators not working |1.5.1c| | 4 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 4 |
| Drive chain worn to excess |6.2.1e| | 3 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Headlamp aim not tested |1.6| | 3 |
| Rear Wheel spoke excessively loose |4.2.1b| | 3 |
| Brake locking device missing |3.2.A1e| | 3 |
| Drive chain excessively loose |6.2.1d| | 3 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Rear Brake locking device missing |3.2.A1e| | 3 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Rear Brake pedal pivots excessively worn |3.1.3a| | 3 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Front Wheel spoke excessively loose |4.2.1b| | 2 |
| Rear Drive chain excessively loose |6.2.1d| | 2 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 2 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 2 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Front Direction indicators not working |1.5.1c| | 2 |
| Nearside Rear Direction indicator not working |1.5.1c| | 2 |
| Rear reflector on motorcycle missing |1.4.1| | 2 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 2 |
| Horn is not a constant note |1.7.3c| | 2 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Direction indicators not working |1.5.1c| | 2 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Rear Motorcycle structure excessively corroded |6.1.1a| | 2 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 2 |
| Stop lamp damaged and function impaired |1.3.3a| | 2 |
| Direction indicator affected by the operation of another lamp |1.5.1c| | 2 |
| Offside Rear Direction indicators not working |1.5.1c| | 2 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 2 |
| Horn is not continous or uniform |1.7.3c| | 2 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 1 |
| Rear wheel spindle loose |2.4.A.2b| | 1 |
| Front Direction indicator affected by the operation of another lamp |1.5.1c| | 1 |
| Rear Direction indicator affected by the operation of another lamp |1.5.1c| | 1 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 1 |
| Rear Brake locking device insecure |3.2.A1e| | 1 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 1 |
| Nearside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 1 |
| Offside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 1 |
| Front Motorcycle structure cracked |6.1.1a| | 1 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 1 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 1 |
| Front Suspension component has an unsafe modification INSUFFIENT TRAVEL IN BOTH FRONT FORK LEGS (5.3.3 (c) (i)) | 1 |
| Front Headlamp main beam affected by the operation of another lamp |1.2.2c| | 1 |
| Front Headlamp dipped beam affected by the operation of the horn |1.2.2c| | 1 |
| Front Headlamp main beam affected by the operation of the horn |1.2.2c| | 1 |
| Front Steering headbearing has excessive free play |2.2.2| | 1 |
| Stop lamp remains on when the brakes are released | 1 |
| All direction indicators not working (4.4.1 (a) (ii)) | 1 |
| All position lamps adversely affected by the operation of another lamp |1.1.3b| | 1 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 1 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 1 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 1 |
| Front Direction indicators flashing less than 60 times a minute |1.5.1c| | 1 |
| Offside Front Direction indicators not working |1.5.1c| | 1 |
| Rear Rear position lamp incorrect colour |1.1.2b| | 1 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 1 |
| Horn not working |7.7 |a| |ii|| | 1 |
| Registration plate issues | 1 |
| Rear Stop lamp missing |1.3.3a| | 1 |
| Front Wheel has an excessively eccentric bead rim. |4.2.2| | 1 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 1 |
| Rear wheel rotation likely to be impeded |6.2.1b| | 1 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 1 |
| Front mudguard insecure |2.3.7| | 1 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 1 |
| Rear Wheel spoke missing |4.2.1b| | 1 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Offside Front Steering lock stop ineffective |2.1.3| | 1 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Rear Stop lamp affected by the operation of another lamp |1.3.2| | 1 |
| Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Nearside Front Direction indicator missing |1.5.1a| | 1 |
| Offside Front Direction indicator missing |1.5.1a| | 1 |
| Nearside Rear Direction indicator missing |1.5.1a| | 1 |
| Offside Rear Direction indicator missing |1.5.1a| | 1 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Stop lamp not working (4.3.1 (a) (ii)) | 1 |
| Rear Stop lamp adversely affected by the operation of another lamp (4.3.3 (b)) | 1 |
| Nearside Front Position lamp switch does not operate the front and rear position lamps |1.1.4c| | 1 |
| Centre Rear Fuel system component leaking |7.2.1a| | 1 |
| Nearside Rear Direction indicator deteriorated and function impaired |1.5.3a| | 1 |
| Centre Front Steering headbearing has excessive free play |2.2.2| | 1 |
| Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Brake lever has inadequate reserve travel |3.1.3b| | 1 |
| Front Direction indicator missing |1.5.1a| | 1 |
| Rear Direction indicator missing |1.5.1a| | 1 |
| Front suspension assembly component excessively misaligned |2.3.1| | 1 |
| Headlamp insecure |1.2.3b| | 1 |
| Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Rear Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 1 |
| Front Wheel alignment incorrect which adversely affects the steering |2.5.1| | 1 |
| Front Throttle operating incorrectly |6.2.1f| | 1 |
| Front Steering lock stop loose |2.1.3| | 1 |
| Offside Outer Front Footrest insecure |6.2.1a| | 1 |
| Front Motorcycle structure excessively corroded |6.1.1a| | 1 |
| Front Motorcycle structure excessively distorted |6.1.1a| | 1 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 1 |
| Rear Stop lamp insecure |1.3.3b| | 1 |
| Front Front position lamp insecure |1.1.1c| | 1 |
| Rear Rear position lamp insecure |1.1.1c| | 1 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 1 |
| Lower Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 1 |
| Front Fairings insecure and likely to impede the steering |2.1.2e| | 1 |
| Brake lever cannot be released smoothly |3.1.3d| | 1 |
| Offside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 1 |
| Fuel hose leaking excessively or a risk of fire |6.1.3 |b| |ii|| | 1 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Riders seat insecure |6.2.1a| | 1 |
| Nearside Front Direction indicator not working |1.5.1c| | 1 |
| Offside Front Direction indicator not working |1.5.1c| | 1 |
| Offside Rear Direction indicator not working |1.5.1c| | 1 |
| Brake pedal pivots excessively worn |3.1.3a| | 1 |
| Rear Brake back plate|s| securing bolt|s| loose |3.2.A1j| | 1 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 1 |
| Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 1 |
| Nearside Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Offside Front Direction indicator deteriorated and function impaired |1.5.3a| | 1 |
| Front Brake lever has insufficient reserve travel |1.1.2 |a|| | 1 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 1 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 1 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Front position lamp deteriorated and function impaired |1.1.1b| | 1 |
| Fuel system component leaking carburetta overflow |6.1.3 |b| |i|| | 1 |
| Rear Brake pedal anti-slip provision missing split pin failed on brake rod |1.1.2 |c|| | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 1 |