| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 115 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 52 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 45 |
| Registration plate issues | 42 |
| Drive chain excessively loose |6.2.1d| | 35 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 29 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 28 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 27 |
| Headlamp aim beam image kick up to the offside |1.6| | 25 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 24 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 24 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 23 |
| Horn not working |1.7.3a| | 22 |
| Rear reflector on motorcycle missing |1.4.1| | 21 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 18 |
| Drive chain excessively tight |6.2.1d| | 17 |
| Drive chain worn to excess |6.2.1e| | 16 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 15 |
| Steering headbearing has excessive free play |2.2.2| | 15 |
| Nearside Front Brake disc|s| excessively worn |3.2.A1l| | 12 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 11 |
| Offside Front Brake disc|s| excessively worn |3.2.A1l| | 11 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 11 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 9 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 9 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 9 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 9 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 9 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 8 |
| Front wheel bearings have excessive free play |2.3.5b| | 8 |
| Front Brake disc|s| insecure |3.2.A1g| | 8 |
| Throttle operating incorrectly |6.2.1f| | 8 |
| Offside Rear Footrest insecure |6.2.1a| | 8 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Nearside Front Direction indicators not working |1.5.1c| | 8 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 8 |
| Front Position lamp not working (4.2.1 (a)) | 8 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 7 |
| Nearside Rear Direction indicator not working |1.5.1c| | 7 |
| Offside Rear Footrest missing |6.2.1a| | 7 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 6 |
| Front Steering headbearing has excessive free play |2.2.2| | 6 |
| Offside Front Brake disc|s| insecure |3.2.A1g| | 6 |
| Riders seat insecure |6.2.1a| | 6 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 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| | 5 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 5 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 5 |
| Brake lever has inadequate reserve travel |3.1.3b| | 5 |
| Offside Front Direction indicators not working |1.5.1c| | 5 |
| Nearside Front Direction indicator not working |1.5.1c| | 5 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 5 |
| Front wheel bearings are excessively rough |2.3.5b| | 5 |
| Offside Rear Direction indicator not working |1.5.1c| | 5 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 5 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 5 |
| Front All position lamps do not illuminate immediately when switched on |1.1.3a| | 5 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 5 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 5 |
| Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 5 |
| Rear Direction indicator flashing more than 120 times per minute |1.5.1c| | 5 |
| Nearside Front Brake disc|s| insecure |3.2.A1g| | 5 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 4 |
| Nearside Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 4 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Centre Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 4 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Offside Front Footrest insecure |6.2.1a| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 4 |
| Rear Drive chain excessively loose |6.2.1d| | 4 |
| Offside Rear Direction indicators not working |1.5.1c| | 4 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 4 |
| Direction indicators not working |1.5.1c| | 3 |
| Offside Front Direction indicator not working |1.5.1c| | 3 |
| Offside Handlebar deformed |2.1.1b| | 3 |
| Nearside Front Direction indicator damaged and function impaired |1.5.3a| | 3 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 3 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Front Position lamp not working |4.2.1 |a|| | 3 |
| Offside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Offside Front Brake disc contaminated |1.1.14 |b|| | 3 |
| Front Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 3 |
| An item not tested |Manual| | 3 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 3 |
| Headlamp aim not tested |1.6| | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Front Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 3 |
| Offside Front Direction indicator damaged and function impaired |1.5.3a| | 3 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 3 |
| Offside Front Direction indicator insecure |1.5.3b| | 3 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 3 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Stop lamp remains on when the brakes are released | 3 |