| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 116 |
| Drive chain excessively loose |6.2.1d| | 42 |
| Rear reflector on motorcycle missing |1.4.1| | 29 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 28 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 28 |
| Drive chain worn to excess |6.2.1e| | 27 |
| Registration plate issues | 25 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 21 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 17 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Front wheel bearings are excessively rough |2.3.5b| | 14 |
| Steering headbearing has excessive free play |2.2.2| | 14 |
| Horn not working |1.7.3a| | 12 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 12 |
| Riders seat insecure |6.2.1a| | 11 |
| Rear reflector missing (4.8.2 (a) (ii)) | 11 |
| Handlebar deformed |2.1.1b| | 10 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 10 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 10 |
| Front wheel bearings have excessive free play |2.3.5b| | 10 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 9 |
| Rear Drive chain worn to excess |6.2.1e| | 9 |
| Drive chain excessively tight |6.2.1d| | 9 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 9 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 9 |
| Rear Drive chain excessively loose |6.2.1d| | 8 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 8 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Nearside Rear Footrest missing |6.2.1a| | 8 |
| Drive chain excessively loose (6.2.1d) | 8 |
| Offside Rear Footrest missing |6.2.1a| | 8 |
| Rear reflector on motorcycle obscured |1.4.1| | 8 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 7 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 7 |
| Headlamp insecure |1.2.3b| | 7 |
| Stop lamp not working (4.3.1 (a) (ii)) | 7 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 6 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 6 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 6 |
| Rear Wheel spoke excessively loose |4.2.1b| | 6 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 5 |
| Rear reflector on motorcycle missing (1.4.1) | 5 |
| Indicator switch insecure |1.5.4| | 5 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Nearside Rear Direction indicators not working |1.5.1c| | 5 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 5 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 5 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 5 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 4 |
| Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Nearside Rear Footrest missing (6.2.1a) | 4 |
| Offside Rear Footrest missing (6.2.1a) | 4 |
| Rear reflector on motorcycle obscured |1.4.2b| | 4 |
| Stop lamp does not illuminate immediately a brake applies (1.3.1a) | 4 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 4 |
| Front Steering headbearing has excessive free play |2.2.2| | 4 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 4 |
| Nearside Rear Direction indicator not working |1.5.1c| | 4 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 4 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 4 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 3 |
| Nearside Rear Direction indicator not working |4.4.1 |a| |ii|| | 3 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 3 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Rear Footrest missing |6.2.1a| | 3 |
| Offside Rear Footrest insecure |6.2.1a| | 3 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 3 |
| Offside Rear Footrest missing (6.2.12 (a)) | 3 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 3 |
| Front wheel bearings are excessively rough (2.3.5b) | 3 |
| Nearside Drive chain worn to excess |6.2.1e| | 3 |
| Nearside Rear Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Rear Position lamp not working |4.2.1 |a|| | 3 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 3 |
| Nearside Rear Direction indicator likely to become detached |4.4.1 |c| |ii|| | 3 |
| Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Rear Position lamp not working (4.2.1 (a)) | 3 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Rear shock absorber insecurely mounted |2.4.A.3b| | 3 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Offside Rear Direction indicator not working |4.4.1 |a| |ii|| | 3 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 3 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Rear Rear reflector on motorcycle obscured |1.4.1| | 3 |
| Riders seat insecure (6.2.1a) | 3 |
| Front Stop lamp does not illuminate immediately a brake applies (1.3.1a) | 2 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Chain guard insecure |6.2.1c| | 2 |
| Rear Drive chain excessively loose (6.2.1d) | 2 |
| Wheel alignment incorrect which adversely affects the handling (2.5.1) | 2 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 2 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 2 |
| Front Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 2 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Front Stop lamp not working from front brake control. (4.3.1 (a) (ii)) | 2 |
| Rear wheel rotation likely to be impeded |6.2.1b| | 2 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Offside Rear Direction indicators not working |1.5.1c| | 2 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 2 |
| Nearside Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 2 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 2 |
| All direction indicators missing (4.4.1 (a) (ii)) | 2 |
| Front Brake disc|s| excessively scored |3.2.A1l| | 2 |
| Offside Rear Direction indicator insecure |1.5.3b| | 2 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Front Brake excessively binding (1.2.1 (f)) | 2 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 2 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 2 |
| Throttle operating incorrectly |6.2.1f| | 2 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 2 |
| Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Rear Wheel spoke cracked. |4.2.1b| | 2 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 2 |
| Rear Footrest missing (6.2.12 (a)) | 2 |
| Offside Rear Direction indicator not working |1.5.1c| | 2 |
| Nearside Rear Drive chain excessively tight |6.2.1d| | 2 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Nearside Rear Footrest insecure (6.2.1a) | 2 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 2 |
| Exhaust mounting does not fully support the exhaust system (7.1.1.c) | 2 |
| Front Position lamp not working |4.2.1 |a|| | 2 |