| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 772 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 361 |
| Registration plate issues | 314 |
| Rear reflector on motorcycle missing |1.4.1| | 313 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 260 |
| Drive chain excessively loose |6.2.1d| | 199 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 170 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 167 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 153 |
| Horn not working |1.7.3a| | 140 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 135 |
| Headlamp aim beam image kick up to the offside |1.6| | 127 |
| Registration plate lamp issues | 114 |
| Drive chain worn to excess |6.2.1e| | 109 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 108 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 98 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 90 |
| Throttle operating incorrectly |6.2.1f| | 89 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 89 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 82 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 80 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 79 |
| Steering headbearing has excessive free play |2.2.2| | 67 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 66 |
| Nearside Front Direction indicator not working |1.5.1c| | 62 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 59 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 56 |
| Front Brake excessively binding (1.2.1 (f)) | 54 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 54 |
| Drive chain excessively tight |6.2.1d| | 54 |
| 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| | 53 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 52 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 50 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 48 |
| Front wheel bearings have excessive free play |2.3.5b| | 47 |
| Offside Front Direction indicator not working |1.5.1c| | 46 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 45 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 45 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 43 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 42 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 42 |
| Nearside Front Direction indicators not working |1.5.1c| | 40 |
| Nearside Rear Direction indicator not working |1.5.1c| | 39 |
| Nearside Rear Direction indicators not working |1.5.1c| | 39 |
| Rear reflector missing (4.8.2 (a) (ii)) | 38 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 36 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 36 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 35 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 35 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 34 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 34 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 32 |
| Offside Rear Direction indicator not working |1.5.1c| | 30 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 30 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 30 |
| Offside Front Footrest insecure |6.2.1a| | 29 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 29 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 29 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 27 |
| Nearside Front Footrest insecure |6.2.1a| | 27 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 27 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 27 |
| Rear Hydraulic brake control feels spongy |3.1.4a| | 26 |
| Front Brake excessively binding |1.2.1 |f|| | 25 |
| Rear reflector missing |4.8.2 |a| |ii|| | 25 |
| Front wheel bearings are excessively rough |2.3.5b| | 25 |
| Offside Front Direction indicators not working |1.5.1c| | 24 |
| Exhaust excessively deteriorated |7.1.1a| | 24 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 24 |
| Rear Drive chain excessively loose |6.2.1d| | 23 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 22 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 21 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 20 |
| Front Position lamp not working (4.2.1 (a)) | 20 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 20 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 19 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 19 |
| Offside Rear Direction indicators not working |1.5.1c| | 19 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 18 |
| Offside Rear Footrest missing |6.2.1a| | 18 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 18 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 18 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 18 |
| Rear Position lamp not working (4.2.1 (a)) | 17 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 17 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 17 |
| Rear Brake excessively binding (1.2.1 (f)) | 17 |
| Rear Brake hose which buldges |3.2.B4| | 17 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 16 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 16 |
| Horn not working (7.7 (a)) | 16 |
| Nearside Rear Footrest missing |6.2.1a| | 16 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 16 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 16 |
| Stop lamp remains on when the brake is released |1.3.1e| | 16 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 16 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Handlebar deformed |2.1.1b| | 15 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 15 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 15 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 15 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 15 |
| Rear Stop lamp does not emit a steady light |1.3.1b| | 15 |
| Nearside Front Brake disc|s| excessively worn |3.2.A1l| | 15 |
| Nearside Footrest insecure |6.2.1a| | 15 |