| Most common failures | No# failures |
|---|
| Rear reflector on motorcycle missing |1.4.1| | 462 |
| Registration plate issues | 440 |
| Headlamp aim out of alignment | 161 |
| Registration plate lamp issues | 76 |
| Horn not working |1.7.3a| | 73 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 72 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 63 |
| Rear reflector missing (4.8.2 (a) (ii)) | 55 |
| Drive chain excessively loose |6.2.1d| | 45 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 45 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 39 |
| 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| | 35 |
| Rear reflector missing |4.8.2 |a| |ii|| | 35 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 26 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 24 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 24 |
| Front wheel bearings are excessively rough |2.3.5b| | 24 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 21 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 20 |
| Front wheel bearings have excessive free play |2.3.5b| | 20 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 20 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 19 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 18 |
| Stop lamp remains on when the brakes are released | 18 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 17 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 15 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 15 |
| Horn not working |7.7 |a| |ii|| | 14 |
| Horn not working (7.7 (a) (ii)) | 14 |
| Drive chain excessively tight |6.2.1d| | 13 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 13 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 13 |
| Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 12 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 12 |
| Drive chain worn to excess |6.2.1e| | 11 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 11 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 11 |
| Steering headbearing has excessive free play |2.2.2| | 11 |
| Nearside Rear Direction indicator not working |1.5.1c| | 11 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 11 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 10 |
| Offside Front Direction indicator not working |1.5.1c| | 10 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 10 |
| Offside Front Direction indicators not working |1.5.1c| | 10 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 10 |
| Front position lamp incorrect colour |1.1.2a| | 10 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 10 |
| Horn not working (7.7 (a)) | 10 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 9 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Nearside Front Direction indicator not working |1.5.1c| | 9 |
| Rear Footrest missing |6.2.1a| | 9 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 9 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 9 |
| Throttle operating incorrectly |6.2.1f| | 9 |
| Nearside Rear Footrest missing |6.2.1a| | 9 |
| Rear Direction indicators affected by the operation of another lamp |1.5.1c| | 8 |
| Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 8 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 8 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 8 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 7 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 7 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 7 |
| Nearside Rear Direction indicators not working |1.5.1c| | 7 |
| Rear Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 7 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 7 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 7 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 7 |
| Offside Front Footrest insecure |6.2.1a| | 6 |
| Offside Rear Direction indicator not working |1.5.1c| | 6 |
| Rear position lamp insecure |1.1.1c| | 6 |
| Rear 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| | 6 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 6 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 6 |
| Offside Rear Footrest missing |6.2.1a| | 6 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 6 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 6 |