| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 332 |
| Registration plate issues | 154 |
| Drive chain excessively loose |6.2.1d| | 112 |
| Rear reflector on motorcycle missing |1.4.1| | 92 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 83 |
| Horn not working |1.7.3a| | 81 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 76 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 63 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 52 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 46 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 45 |
| Registration plate lamp issues | 42 |
| 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| | 42 |
| Drive chain worn to excess |6.2.1e| | 42 |
| Offside Front Footrest insecure |6.2.1a| | 36 |
| Headlamp aim beam image kick up to the offside |1.6| | 34 |
| Throttle operating incorrectly |6.2.1f| | 30 |
| Drive chain excessively tight |6.2.1d| | 28 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 27 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 23 |
| Rear reflector missing (4.8.2 (a) (ii)) | 22 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 22 |
| Nearside Rear Direction indicator not working |1.5.1c| | 21 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 21 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 19 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 19 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 19 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 18 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 18 |
| Riders seat insecure |6.2.1a| | 17 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 17 |
| Nearside Rear Direction indicators not working |1.5.1c| | 14 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 13 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 13 |
| Nearside Front Direction indicator not working |1.5.1c| | 13 |
| Rear reflector missing |4.8.2 |a| |ii|| | 12 |
| Offside Rear Direction indicator not working |1.5.1c| | 12 |
| Horn not working (7.7 (a) (ii)) | 12 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 12 |
| Offside Rear Direction indicators not working |1.5.1c| | 11 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 11 |
| Nearside Front Direction indicator insecure |1.5.3b| | 10 |
| Offside Front Direction indicator insecure |1.5.3b| | 10 |
| Stop lamp remains on when the brake is released |1.3.1e| | 10 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 10 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 10 |
| Offside Footrest insecure |6.2.1a| | 10 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 10 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 10 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 10 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 10 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 10 |
| Nearside Front Footrest insecure |6.2.1a| | 9 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 9 |
| Front Brake fluid reservoir insecurely mounted |3.2.B1a| | 9 |
| Rear Drive chain excessively loose |6.2.1d| | 9 |
| Offside Front Direction indicators not working |1.5.1c| | 9 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 9 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 9 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 9 |
| Front position lamp incorrect colour |1.1.2a| | 9 |
| Rear reflector on motorcycle missing (1.4.1) | 9 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 8 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 8 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 8 |
| Offside Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 8 |
| Front Position lamp not working (4.2.1 (a)) | 8 |
| Front Brake excessively binding (1.2.1 (f)) | 8 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 8 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 8 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Front Brake excessively binding |1.2.1 |f|| | 8 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Front wheel bearings have excessive free play |2.3.5b| | 8 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 8 |
| Rear Brake pedal is damaged and the brake cannot be readily applied |3.1.3c| | 8 |
| Offside Front Direction indicator not working |1.5.1c| | 7 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 7 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 7 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 7 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 7 |
| Front Headlamp aim beam image kick-up is to the offside |1.6.1| | 7 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 7 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 7 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 7 |
| Rear Brake excessively binding (1.2.1 (f)) | 7 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 7 |