| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 166 |
| Rear reflector on motorcycle missing |1.4.1| | 121 |
| Registration plate issues | 109 |
| Registration plate lamp issues | 36 |
| Horn not working |1.7.3a| | 32 |
| Rear reflector missing (4.8.2 (a) (ii)) | 24 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 20 |
| Drive chain excessively loose |6.2.1d| | 16 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 14 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 14 |
| 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| | 12 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 12 |
| Front position lamp incorrect colour |1.1.2a| | 10 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 10 |
| Drive chain excessively tight |6.2.1d| | 9 |
| Horn not working (7.7 (a) (ii)) | 9 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 7 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 7 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 6 |
| Horn not working |7.7 |a| |ii|| | 6 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| Stop lamp remains on when the brakes are released | 6 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 5 |
| Offside Front Footrest insecure |6.2.1a| | 5 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 5 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 5 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Front wheel bearings are excessively rough |2.3.5b| | 4 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 4 |
| Drive chain worn to excess |6.2.1e| | 4 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Offside Rear Direction indicator not working |1.5.1c| | 4 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 4 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 4 |
| Nearside Rear Direction indicator not working |1.5.1c| | 4 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition |8.1.1 |a|| | 4 |
| Nearside Rear Direction indicators not working |1.5.1c| | 4 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 4 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Rear reflector missing |4.8.2 |a| |ii|| | 4 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 4 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 4 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 4 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 3 |
| Centre Rear reflector on motorcycle missing |1.4.1| | 3 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 3 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 3 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 3 |
| Nearside Front Footrest insecure |6.2.1a| | 3 |
| Throttle operating incorrectly |6.2.1f| | 3 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Nearside Front Direction indicator not working |1.5.1c| | 3 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Offside Front Direction indicator not working |1.5.1c| | 3 |
| Handlebar deformed |2.1.1b| | 3 |
| Nearside Rear Direction indicator affected by the operation of another lamp |1.5.1c| | 3 |
| Offside Rear Direction indicator affected by the operation of another lamp |1.5.1c| | 3 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 3 |
| Drive chain excessively loose (6.2.1d) | 3 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Rear Wheel spindle locking device missing (5.2.1 (d)) | 3 |