| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 8 |
| Drive chain excessively loose |6.2.1d| | 4 |
| Horn not working |1.7.3a| | 3 |
| Headlamp aim beam image kick up to the offside |1.6| | 2 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 2 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 1 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 1 |
| Rear Brake master cylinder leaking hydraulic fluid |3.2.B1e| | 1 |
| Nearside Front Footrest insecure |6.2.1a| | 1 |
| Horn is not continous or uniform |1.7.3c| | 1 |
| Brake lever cannot be released smoothly |3.1.3d| | 1 |
| Front wheel bearings are excessively rough |2.3.5b| | 1 |
| Horn not working |7.7 |a| |ii|| | 1 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 1 |
| Horn not working (7.7 (a) (ii)) | 1 |
| Front Brake hose leaking (1.1.12 (c)) | 1 |
| Front Brake hose bulging under pressure (1.1.12 (d)) | 1 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 1 |
| Horn not working (7.7 (a)) | 1 |
| Fuel cap sealing washer missing |7.2.2c| | 1 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 1 |
| Drive chain horseshoe locking device incorrectly fitted |6.1.7 |j| |i|| | 1 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Central Rear Upper Position lamp not working Side light not working (4.2.1 (a)) | 1 |
| Nearside Rear Lower Wheel bearing so rough it is likely to overheat or break up Wheel bearing excessively tight (5.1.3 (b) (ii)) | 1 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 1 |
| Registration plate issues | 1 |
| Front Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Rear Direction indicator flashing less than 60 times a minute |1.5.1c| | 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 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 1 |
| Direction indicators not working |1.5.1c| | 1 |
| Front wheel bearings have excessive free play |2.3.5b| | 1 |
| Drive chain worn to excess |6.2.1e| | 1 |
| Offside Rear Lower Brake master cylinder defective but brake still operating Brake master cylinder sticking (1.1.10 (b) (i)) | 1 |
| Front Wheel bearing play so excessive that directional control is impaired (5.1.3 (a) (ii)) | 1 |
| Front Horn not working (7.7 (a) (ii)) | 1 |
| Central Front Steering headbearing has excessive wear or free play Head bearings excessive play |2.2.2 |f| |i|| | 1 |
| Offside Rear Brake pedal insecure |3.1.2a| | 1 |
| Nearside Front Brake pipe inadequately supported |3.2.B2b| | 1 |
| Steering headbearing has excessive free play |2.2.2| | 1 |
| Rear wheel spindle loose |2.4.A.2b| | 1 |
| Stop lamp does not illuminate immediately a brake applies Front |1.3.1a| | 1 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Nearside Rear Direction indicators not working |1.5.1c| | 1 |