| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 193 |
| Rear reflector on motorcycle missing |1.4.1| | 118 |
| Drive chain excessively loose |6.2.1d| | 92 |
| Registration plate issues | 82 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 72 |
| Drive chain worn to excess |6.2.1e| | 60 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 54 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 40 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 38 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 31 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 29 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 28 |
| Horn not working |1.7.3a| | 27 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 26 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 25 |
| Headlamp insecure |1.2.3b| | 24 |
| Drive chain excessively tight |6.2.1d| | 20 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 19 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 18 |
| Rear reflector on motorcycle obscured |1.4.1| | 17 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 16 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 15 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 14 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 14 |
| Rear reflector missing (4.8.2 (a) (ii)) | 14 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 13 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 13 |
| Steering headbearing has excessive free play |2.2.2| | 13 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 12 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 12 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 12 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 12 |
| Handlebar deformed |2.1.1b| | 12 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 11 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 11 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Registration plate lamp issues | 10 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 9 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 9 |
| Headlamp aim not tested |1.6| | 9 |
| Nearside Front Direction indicator not working |1.5.1c| | 8 |
| Throttle operating incorrectly |6.2.1f| | 8 |
| Rear Direction indicator incorrect colour |1.5.1b| | 8 |
| Headlamp aim beam image kick up to the offside |1.6| | 8 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 8 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 7 |
| Rear Drive chain excessively loose |6.2.1d| | 7 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 7 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 7 |
| Headlamp aim not tested (4.1.2 (b)) | 7 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 7 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 6 |
| Riders seat insecure |6.2.1a| | 6 |
| Offside Front Direction indicators not working |1.5.1c| | 6 |
| Nearside Rear Direction indicator not working |1.5.1c| | 6 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 6 |
| Front Direction indicator incorrect colour |1.5.1b| | 6 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 6 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 6 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 6 |
| Rear Position lamp not working (4.2.1 (a)) | 6 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 6 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 5 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 5 |
| Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Nearside Front Direction indicators not working |1.5.1c| | 5 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 5 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 5 |
| Front Headlamp insecure |1.2.3b| | 5 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Offside Rear Direction indicator insecure |1.5.3b| | 4 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 4 |
| Rear Drive chain worn to excess |6.2.1e| | 4 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 4 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 4 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 4 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 4 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 3 |
| Direction indicators not working |1.5.1c| | 3 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 3 |
| Rear Direction indicator not working |1.5.1c| | 3 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 3 |
| Offside Rear Direction indicator not working |1.5.1c| | 3 |
| Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 3 |
| An item not tested |Manual| | 3 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 3 |
| Brake lever attachment screws missing |3.1.2b| | 3 |
| Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Fuel system component leaking |7.2.1a| | 3 |
| Front Steering headbearing has excessive free play |2.2.2| | 3 |
| Front Direction indicator not working |1.5.1c| | 3 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 3 |
| Offside Direction indicator incorrect colour |1.5.1b| | 3 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 3 |
| Rear Brake fluid reservoir insecurely mounted |3.2.B1a| | 3 |
| Offside Direction indicators not working |1.5.1c| | 3 |
| Drive chain worn to excess |6.1.7 |c| |i|| | 3 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 3 |
| Front position lamp insecure |1.1.1c| | 3 |
| Rear Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 3 |
| Nearside Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Stop lamp remains on when the brakes are released | 3 |
| Headlamp insecure (4.1.1 (c)) | 3 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 3 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |