| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 166 |
| Rear reflector on motorcycle missing |1.4.1| | 71 |
| Registration plate issues | 58 |
| Registration plate lamp issues | 25 |
| Throttle operating incorrectly |6.2.1f| | 17 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 17 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 15 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 12 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 11 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 11 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 11 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 10 |
| Drive chain excessively loose |6.2.1d| | 10 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 10 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 9 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 9 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 9 |
| Rear reflector missing |4.8.2 |a| |ii|| | 9 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 9 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 8 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 7 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 7 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |
| Horn not working |1.7.3a| | 6 |
| Drive chain excessively tight |6.2.1d| | 6 |
| 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 |
| Horn not working (7.7 (a) (ii)) | 6 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 5 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 5 |
| Drive chain worn to excess |6.2.1e| | 5 |
| Rear reflector missing (4.8.2 (a) (ii)) | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 5 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 4 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Offside Front Direction indicators not working |1.5.1c| | 3 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 3 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 3 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Offside Rear suspension bush has excessive free play |2.4.A2a|i|| | 3 |
| Offside Front Brake disc contaminated |1.1.14 |b|| | 3 |
| Stop lamp remains on when the brakes are released | 3 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Front Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 3 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Front wheel bearings have excessive free play |2.3.5b| | 3 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 3 |
| Rear Stop lamp does not emit a steady light |1.3.1b| | 3 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 3 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 3 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Front Position lamp not working (4.2.1 (a)) | 3 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 3 |