| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 320 |
| Registration plate issues | 229 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 99 |
| Headlamp aim beam image kick up to the offside |1.6| | 98 |
| Rear reflector on motorcycle missing |1.4.1| | 82 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 81 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 76 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 73 |
| Drive chain excessively loose |6.2.1d| | 70 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 69 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 67 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 66 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 50 |
| 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| | 49 |
| Horn not working |1.7.3a| | 37 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 37 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 34 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 33 |
| Throttle operating incorrectly |6.2.1f| | 31 |
| Rear Brake disc|s| cracked |3.2.A1g| | 31 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 29 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 28 |
| Steering headbearing has excessive free play |2.2.2| | 26 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 26 |
| Nearside Rear Direction indicator not working |1.5.1c| | 23 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 23 |
| Drive chain worn to excess |6.2.1e| | 22 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 21 |
| Nearside Front Direction indicator not working |1.5.1c| | 20 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 20 |
| Offside Front Direction indicator not working |1.5.1c| | 20 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 19 |
| Offside Rear Direction indicators not working |1.5.1c| | 18 |
| Front wheel bearings have excessive free play |2.3.5b| | 16 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 16 |
| Offside Rear Direction indicator not working |1.5.1c| | 16 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 16 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 15 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 15 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 15 |
| Drive chain excessively tight |6.2.1d| | 14 |
| Nearside Rear Direction indicators not working |1.5.1c| | 14 |
| Direction indicators not working |1.5.1c| | 13 |
| Horn not working (7.7 (a) (ii)) | 13 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 12 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 12 |
| Headlamp switch faulty |1.2.4| | 12 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 12 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 12 |
| Front Position lamp not working (4.2.1 (a)) | 12 |
| Front Steering headbearing has excessive free play |2.2.2| | 11 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 11 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 11 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 11 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 11 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 10 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 10 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 10 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 10 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 10 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 9 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 9 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 9 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 9 |
| Front wheel bearings are excessively rough |2.3.5b| | 9 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 9 |
| Front Roller brake test indicates a severely juddering brake |3.3.A1b| | 8 |
| Nearside Front Direction indicators not working |1.5.1c| | 8 |
| Offside Front Direction indicators not working |1.5.1c| | 8 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 8 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 8 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 8 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 8 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 8 |
| Rear reflector missing (4.8.2 (a) (ii)) | 8 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 7 |
| Rear Exhaust markings indicating not for road use or similar wording |7.1.4| | 7 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 7 |
| Rear Brake caliper|s| insecure |3.2.A1j| | 7 |
| Front Brake disc|s| is excessively distorted |3.2.A1m| | 7 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 7 |
| Front position lamp incorrect colour |1.1.2a| | 7 |
| Nearside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 7 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 7 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 7 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 7 |
| Offside Front Brake disc contaminated (1.1.14 (b)) | 7 |
| Front Brake excessively binding (1.2.1 (f)) | 7 |