| Most common failures | No# failures |
|---|
| Registration plate issues | 110 |
| Rear reflector on motorcycle missing |1.4.1| | 68 |
| Front wheel bearings have excessive free play |2.3.5b| | 28 |
| Headlamp aim out of alignment | 25 |
| Horn not working |1.7.3a| | 24 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 17 |
| Horn missing |1.7.1| | 17 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 16 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Rear reflector missing (4.8.2 (a) (ii)) | 15 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 11 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 10 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 10 |
| Registration plate lamp issues | 9 |
| Front wheel bearings are excessively rough |2.3.5b| | 9 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 6 |
| Steering headbearing has excessive free play |2.2.2| | 6 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 6 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 5 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Horn not working |7.7 |a| |ii|| | 4 |
| Rear Wheel spoke excessively loose |4.2.1b| | 4 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 4 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 4 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 4 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Front Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 3 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 3 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Horn not working (7.7 (a)) | 3 |
| Front Horn missing |1.7.1| | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Central Front Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Central Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Central Front Headlamp not working on main beam |4.1.1 |a| |ii|| | 2 |
| Drive chain worn to excess |6.2.1e| | 2 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 2 |
| Rear Brake cylinder leaking hydraulic fluid |3.2.B1e| | 2 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 2 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 2 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 2 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Stop lamp missing |1.3.3a| | 2 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 2 |
| 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| | 2 |
| Rear reflector on sidecar missing |1.4.1| | 2 |
| Front Brake excessively binding (1.2.1 (f)) | 2 |
| Rear Direction indicator missing |1.5.1a| | 2 |
| Front Direction indicator missing |1.5.1a| | 2 |
| Lower Rear suspension bearing has excessive free play |2.4.A2a|i|| | 2 |
| Rear Shock absorber has negligible damping effect |5.3.2 |b|| | 2 |
| Rear position lamp incorrect colour |1.1.2b| | 2 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 2 |
| Headlamp aim unable to be tested (4.1.2 (b)) | 2 |
| All position lamps not working (4.2.1 (a)) | 2 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 2 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 2 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Headlamp insecure (4.1.1 (c)) | 2 |
| Offside Rear Direction indicator missing |1.5.1a| | 2 |
| Rear Position lamp not working |4.2.1 |a|| | 2 |