| Most common failures | No# failures |
|---|
| Rear reflector on motorcycle missing |1.4.1| | 289 |
| Registration plate issues | 267 |
| Headlamp aim out of alignment | 91 |
| Registration plate lamp issues | 46 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 32 |
| Rear reflector missing (4.8.2 (a) (ii)) | 32 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 30 |
| Drive chain excessively loose |6.2.1d| | 26 |
| Rear reflector missing |4.8.2 |a| |ii|| | 25 |
| 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| | 25 |
| Horn not working |1.7.3a| | 23 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 22 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 20 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 20 |
| Drive chain worn to excess |6.2.1e| | 16 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 13 |
| Drive chain excessively tight |6.2.1d| | 13 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 13 |
| Front wheel bearings have excessive free play |2.3.5b| | 13 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 13 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 11 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 11 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 10 |
| Riders seat insecure |6.2.1a| | 10 |
| Nearside Front Footrest insecure |6.2.1a| | 9 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 9 |
| Horn not working (7.7 (a)) | 8 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 7 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 7 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 7 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 7 |
| Nearside Front Direction indicators not working |1.5.1c| | 7 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 6 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 6 |
| Front Brake excessively binding (1.2.1 (f)) | 6 |
| Offside Front Direction indicators not working |1.5.1c| | 6 |
| Nearside Rear Direction indicator not working |1.5.1c| | 6 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 6 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 5 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 5 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 5 |
| Rear Drive chain excessively loose |6.2.1d| | 5 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 5 |
| Throttle operating incorrectly |6.2.1f| | 5 |
| Offside Front Footrest insecure |6.2.1a| | 4 |
| Horn not working |7.7 |a| |ii|| | 4 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 4 |
| Nearside Front Brake disc|s| insecure |3.2.A1g| | 4 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 4 |
| Front wheel bearings are excessively rough |2.3.5b| | 4 |
| Front Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 4 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 4 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 4 |