| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 113 |
| Registration plate issues | 78 |
| Rear reflector missing (4.8.2 (a) (ii)) | 70 |
| Rear reflector on motorcycle missing |1.4.1| | 45 |
| Drive chain excessively loose |6.2.1d| | 34 |
| Rear Brake excessively binding (1.2.1 (f)) | 28 |
| Registration plate lamp issues | 26 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 21 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 19 |
| Rear reflector missing |4.8.2 |a| |ii|| | 19 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 19 |
| Front Brake excessively binding (1.2.1 (f)) | 18 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 17 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 17 |
| Drive chain worn to excess |6.2.1e| | 16 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 16 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 15 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 15 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 14 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 13 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 11 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 11 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 11 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 11 |
| Horn not working |1.7.3a| | 10 |
| Horn not working (7.7 (a) (ii)) | 10 |
| Rear Footrest missing (6.2.12 (a)) | 10 |
| Horn not working (7.7 (a)) | 10 |
| Headlamp insecure (4.1.1 (c)) | 9 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 9 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 9 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Front Position lamp not working (4.2.1 (a)) | 8 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 8 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 8 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Offside Rear Footrest missing (6.2.12 (a)) | 8 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 7 |
| Rear Brake excessively binding |1.2.1 |f|| | 7 |
| 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)) | 7 |
| Stop lamp remains on when the brakes are released | 7 |
| Rear Position lamp not working (4.2.1 (a)) | 7 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 7 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 6 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 6 |
| Nearside Rear Footrest missing (6.2.12 (a)) | 6 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 6 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 6 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 6 |
| Headlamp insecure |1.2.3b| | 6 |
| Horn not working |7.7 |a| |ii|| | 6 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 6 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 6 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 5 |
| Drive chain horseshoe locking device incorrectly fitted |6.1.7 |j| |i|| | 5 |
| Headlamp aim not tested (4.1.2 (b)) | 5 |
| Front Wheel excessively distorted (5.2.2 (c) (i)) | 5 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 5 |
| Nearside Rear Footrest missing |6.2.12 |a|| | 5 |
| Offside Rear Footrest missing |6.2.12 |a|| | 5 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 5 |
| Nearside Front Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 5 |
| Steering headbearing has excessive free play |2.2.2| | 5 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 5 |
| Nearside Rear Direction indicator missing (4.4.1 (a) (ii)) | 5 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 4 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 4 |
| Rear Position lamp not working |4.2.1 |a|| | 4 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 4 |
| Rear Footrest missing |6.2.1a| | 4 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Front Brake disc contaminated (1.1.14 (b)) | 4 |
| Headlamp aim unable to be tested (4.1.2 (b)) | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Indicator switch insecure |1.5.4| | 4 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 4 |
| Central Rear Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 4 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Drive chain excessively tight, so that it is likely to fail (6.1.7 (k) (ii)) | 3 |
| Nearside Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 3 |
| Front Stop lamp switch with a delay in operation (4.3.2 (a) (ii)) | 3 |
| Front Headlamp insecure (4.1.1 (c)) | 3 |
| Drive chain excessively tight |6.2.1d| | 3 |
| Front Wheel spoke excessively loose (5.2.2 (d)) | 3 |
| 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|| | 3 |
| Horn missing |1.7.1| | 3 |
| Nearside Rear Footrest missing |6.2.1a| | 3 |
| Offside Rear Footrest missing |6.2.1a| | 3 |
| Direction indicators not working |1.5.1c| | 3 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 3 |
| Rear Brake disc significantly and obviously worn |1.1.14 |a| |i|| | 3 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Handlebar deformed |2.1.1b| | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 3 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |
| All direction indicators not working (4.4.1 (a) (ii)) | 3 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 3 |
| Rear Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 3 |
| Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 3 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 3 |
| Steering headbearing excessively stiff or notchy |2.2.2 |f| |i|| | 3 |