| Most common failures | No# failures |
|---|
| Registration plate issues | 511 |
| Headlamp aim out of alignment | 488 |
| Drive chain excessively loose |6.2.1d| | 287 |
| Rear reflector on motorcycle missing |1.4.1| | 282 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 205 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 183 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 138 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 133 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 129 |
| Drive chain worn to excess |6.2.1e| | 128 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 111 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 111 |
| Steering headbearing has excessive free play |2.2.2| | 94 |
| Horn not working |1.7.3a| | 83 |
| Registration plate lamp issues | 81 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 81 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 76 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 74 |
| 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| | 72 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 69 |
| Drive chain excessively tight |6.2.1d| | 68 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 66 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 61 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 60 |
| Front wheel bearings have excessive free play |2.3.5b| | 56 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 54 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 54 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 51 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 50 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 46 |
| Rear reflector missing (4.8.2 (a) (ii)) | 42 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 41 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 41 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 40 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 40 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 38 |
| Nearside Front Direction indicator not working |1.5.1c| | 36 |
| Riders seat insecure |6.2.1a| | 36 |
| Rear Drive chain excessively loose |6.2.1d| | 36 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 35 |
| Offside Front Direction indicator not working |1.5.1c| | 34 |
| Headlamp insecure |1.2.3b| | 33 |
| Offside Handlebar deformed |2.1.1b| | 31 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 30 |
| Headlamp switch faulty |1.2.4| | 30 |
| Nearside Front Direction indicators not working |1.5.1c| | 28 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 28 |
| Nearside Rear Direction indicator not working |1.5.1c| | 28 |
| Throttle operating incorrectly |6.2.1f| | 28 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 28 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 27 |
| Front Brake excessively binding (1.2.1 (f)) | 26 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 26 |
| Offside Front Direction indicators not working |1.5.1c| | 25 |
| Offside Rear Direction indicator not working |1.5.1c| | 25 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 25 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 25 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 25 |
| Nearside Rear Footrest missing |6.2.1a| | 25 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 24 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 24 |
| Offside Front Direction indicator insecure |1.5.3b| | 24 |
| Stop lamp remains on when the brake is released |1.3.1e| | 24 |
| Front wheel bearings are excessively rough |2.3.5b| | 24 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 23 |
| Nearside Rear Direction indicators not working |1.5.1c| | 22 |
| Front Steering headbearing has excessive free play |2.2.2| | 22 |
| Direction indicators not working |1.5.1c| | 22 |
| Offside Rear Footrest missing |6.2.1a| | 22 |
| Stop lamp remains on when the brakes are released | 21 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 21 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 21 |
| Offside Rear Direction indicators not working |1.5.1c| | 20 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 20 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 20 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 20 |
| Rear Brake excessively binding (1.2.1 (f)) | 19 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 19 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 19 |
| Offside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 19 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 19 |
| Rear Footrest missing |6.2.1a| | 18 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 18 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 18 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 18 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 18 |
| Nearside Front Direction indicator insecure |1.5.3b| | 18 |
| Front position lamp incorrect colour |1.1.2a| | 17 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 17 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 17 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 16 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 16 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 16 |
| Horn not working (7.7 (a) (ii)) | 16 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 16 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 16 |
| Nearside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 15 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 15 |
| Brake lever cannot be applied smoothly |3.1.3d| | 15 |
| Front Brake excessively binding |1.2.1 |f|| | 15 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 15 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 15 |
| Rear Drive chain worn to excess |6.2.1e| | 15 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 14 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 14 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 14 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 14 |
| Rear reflector missing |4.8.2 |a| |ii|| | 14 |
| Headlamp aim beam image kick up to the offside |1.6| | 14 |
| Front Brake disc|s| is excessively distorted |3.2.A1m| | 14 |