| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 183 |
| Drive chain excessively loose |6.2.1d| | 55 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 41 |
| Throttle operating incorrectly |6.2.1f| | 40 |
| Registration plate issues | 35 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 33 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 32 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 32 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 29 |
| Steering headbearing has excessive free play |2.2.2| | 28 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 25 |
| Front wheel bearings have excessive free play |2.3.5b| | 20 |
| Horn not working |1.7.3a| | 20 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 19 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 19 |
| Drive chain worn to excess |6.2.1e| | 19 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 18 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 17 |
| Drive chain excessively tight |6.2.1d| | 17 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 15 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 15 |
| Headlamp aim beam image kick up to the offside |1.6| | 14 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 12 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 11 |
| Rear reflector on motorcycle missing |1.4.1| | 10 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 10 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 10 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 9 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 9 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 9 |
| Handlebar deformed |2.1.1b| | 8 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 8 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 8 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 8 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Rear Drive chain excessively loose |6.2.1d| | 7 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 7 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 6 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 6 |
| Front Brake disc|s| cracked |3.2.A1g| | 6 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 6 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 6 |
| Riders seat insecure |6.2.1a| | 6 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 6 |
| Rear Brake locking device missing |3.2.A1e| | 6 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 6 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 5 |
| 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 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 5 |
| Drive chain fouling another component |6.2.1d| | 5 |
| Brake locking device missing |3.2.A1e| | 5 |
| Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 5 |
| Headlamp insecure |1.2.3b| | 5 |
| Nearside Rear Direction indicator not working |1.5.1c| | 5 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 5 |
| Front Steering headbearing has excessive free play |2.2.2| | 5 |
| Nearside Front Direction indicator not working |1.5.1c| | 5 |
| Front wheel bearings are excessively rough |2.3.5b| | 5 |
| Front Horn not working |1.7.3a| | 5 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 4 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 4 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 4 |
| Nearside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 4 |
| Offside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 4 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 4 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Rear Brake linkage has abnormal movement due to maladjustment |3.2.A1i| | 4 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 4 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 4 |
| Brake lever cannot be applied smoothly |3.1.3d| | 4 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 3 |
| Nearside Front Footrest insecure |6.2.1a| | 3 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 3 |
| Nearside Steering lock stop ineffective |2.1.3| | 3 |
| Front Brake master cylinder leaking hydraulic fluid |3.2.B1e| | 3 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 3 |
| Headlamp deteriorated and function impaired |1.2.3a| | 3 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 3 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Stop lamp remains on when the brakes are released | 3 |
| Rear Position lamp not working |4.2.1 |a|| | 3 |
| Indicator switch insecure |1.5.4| | 3 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 3 |
| Rear Position lamp not working (4.2.1 (a)) | 3 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 3 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Front Plate brake test indicates a binding brake |3.3.B1a| | 3 |
| Chain guard insecure |6.2.1c| | 3 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Rear Footrest missing |6.2.1a| | 3 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 3 |
| Front suspension assembly component excessively misaligned |2.3.1| | 3 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Front Headlamp insecure |1.2.3b| | 3 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 3 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 3 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 3 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 3 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 3 |
| Front Valve stem seriously damaged |5.2.3 |j|| | 3 |