| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 72 |
| Headlamp aim beam image kick up to the offside |1.6| | 64 |
| Registration plate issues | 43 |
| Rear reflector on motorcycle missing |1.4.1| | 16 |
| 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| | 14 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 12 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 12 |
| Drive chain excessively loose |6.2.1d| | 11 |
| Horn not working |1.7.3a| | 9 |
| Throttle operating incorrectly |6.2.1f| | 8 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 6 |
| Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 4 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 4 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 3 |
| Headlamp aim beam image kick-up is to the offside |1.6.1| | 3 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Front Headlamp aim beam image kick-up is to the offside |1.6.1| | 3 |
| Drive chain worn to excess |6.2.1e| | 3 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Drive chain excessively tight |6.2.1d| | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 3 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 3 |
| Front Position lamp not working (4.2.1 (a)) | 3 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Rear Position lamp not working (4.2.1 (a)) | 2 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 2 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 2 |
| Rear Direction indicator incorrect colour |1.5.1b| | 2 |
| Position lamp switch does not operate the front and rear position lamps |1.1.4c| | 2 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Fuel system component leaking |7.2.1a| | 2 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 2 |
| Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Rear Brake locking device missing |3.2.A1e| | 2 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 2 |
| Drive chain so loose it is likely to fail |6.1.7 |c| |ii|| | 2 |
| Throttle operating incorrectly |6.2.7 |a| |i|| | 2 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 2 |
| Registration plate lamp issues | 2 |
| Front position lamp incorrect colour |1.1.2a| | 2 |
| Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 2 |
| Nearside Direction indicator not working |1.5.1c| | 2 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 2 |
| Steering headbearing has excessive free play |2.2.2| | 2 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 2 |
| Central Rear Lower Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Fuel tank leaking |7.2.1a| | 2 |
| Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Nearside Front Direction indicator not working |1.5.1c| | 2 |