| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 9 |
| Drive chain excessively loose |6.2.1d| | 8 |
| Front wheel bearings have excessive free play |2.3.5b| | 6 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 6 |
| Drive chain worn to excess |6.2.1e| | 6 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Drive chain fouling another component |6.2.1d| | 3 |
| Headlamp aim beam image kick up to the offside |1.6| | 3 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Registration plate issues | 3 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 2 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Direction indicators not working |1.5.1c| | 2 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Steering headbearing has excessive free play |2.2.2| | 2 |
| Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 2 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Nearside Direction indicators not working |1.5.1c| | 2 |
| Offside Rear Direction indicator not working |1.5.1c| | 2 |
| Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 1 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Front Direction indicators not working |1.5.1c| | 1 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Rear Direction indicator not working |1.5.1c| | 1 |
| Horn not working |1.7.3a| | 1 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Nearside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Nearside Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 1 |
| Front Horn not working |1.7.3a| | 1 |
| Front Steering headbearing has excessive free play |2.2.2| | 1 |
| Offside Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Nearside Drive chain excessively loose |6.2.1d| | 1 |
| Nearside Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Rear Brake performance not tested |3.3| | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 1 |
| Brake hose damaged | 1 |
| Rear Brake locking device missing |3.2.A1e| | 1 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Front Front mudguard insecure |2.3.7| | 1 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 1 |
| Offside Front Direction indicator not working |1.5.1c| | 1 |
| Nearside Rear Direction indicator not working |1.5.1c| | 1 |
| Rear wheel spindle securing nut|s| loose |2.4.A.2b| | 1 |
| Brake pedal insecure |3.1.2a| | 1 |
| Front Direction indicator not working |1.5.1c| | 1 |
| Rear reflector on motorcycle missing |1.4.1| | 1 |
| Riders seat insecure |6.2.1a| | 1 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Front Headlamp insecure |1.2.3b| | 1 |
| Offside Front Footrest insecure |6.2.1a| | 1 |
| Rear Footrest missing |6.2.1a| | 1 |
| Exhaust mounting missing |7.1.1c| | 1 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 1 |
| Lower Rear mono-shock pivot excessively worn |2.4.B.4| | 1 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Steering control handlebar movement restricted by trapped cables |2.1.2c| | 1 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 1 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 1 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected |6.2.7 |a| |ii|| | 1 |
| Offside Rear Brake disc|s| excessively scored |3.2.A1l| | 1 |
| Rear Seat insecure |6.2.1a| | 1 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Rear Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 1 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 1 |
| Front position lamp incorrect colour |1.1.2a| | 1 |
| Headlamp incorrect colour |1.2.1| | 1 |
| Headlamp deteriorated and function impaired |1.2.3a| | 1 |
| Rear reflector missing |4.8.2 |a| |ii|| | 1 |
| Exhaust noise is clearly in excess of that emitted by a similar motor bicycle fitted with a standard silencer in average condition |7.1.2| | 1 |
| Nearside Steering lock stop ineffective |2.1.3| | 1 |
| Rear Drive chain excessively loose |6.2.1d| | 1 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 1 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Front Brake disc|s| is excessively distorted |3.2.A1m| | 1 |
| Offside Direction indicators not working |1.5.1c| | 1 |
| Nearside Chain guard insecure |6.2.1c| | 1 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 1 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Front Riders seat insecure |6.2.1a| | 1 |