| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 167 |
| Registration plate issues | 55 |
| Drive chain excessively loose |6.2.1d| | 43 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 33 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 32 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 31 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 30 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 24 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 23 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 23 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 20 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 19 |
| Headlamp aim beam image kick up to the offside |1.6| | 19 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 18 |
| Throttle operating incorrectly |6.2.1f| | 15 |
| Drive chain excessively tight |6.2.1d| | 15 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 15 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Drive chain worn to excess |6.2.1e| | 14 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 14 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 13 |
| 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| | 13 |
| Steering headbearing has excessive free play |2.2.2| | 12 |
| Horn not working |1.7.3a| | 12 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 12 |
| Rear reflector on motorcycle missing |1.4.1| | 11 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 10 |
| Offside Front Direction indicators not working |1.5.1c| | 9 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 9 |
| Riders seat insecure |6.2.1a| | 8 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 8 |
| Exhaust excessively deteriorated |7.1.1a| | 7 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 7 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 7 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 7 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 7 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 7 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| Nearside Front Direction indicators not working |1.5.1c| | 6 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 6 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 6 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 6 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 5 |
| Nearside Rear Direction indicators not working |1.5.1c| | 5 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 5 |
| All direction indicators not working (4.4.1 (a) (ii)) | 5 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 5 |
| Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 5 |
| Registration plate lamp issues | 5 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Front Direction indicator incorrect colour |1.5.1b| | 4 |
| Offside Rear Direction indicator not working |1.5.1c| | 4 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 4 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Offside Direction indicators flashing more than 120 times per minute |1.5.1c| | 4 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 4 |
| Front position lamp incorrect colour |1.1.2a| | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 4 |