| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 141 |
| Registration plate issues | 39 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 26 |
| Drive chain excessively loose |6.2.1d| | 21 |
| Horn not working |1.7.3a| | 21 |
| Rear reflector on motorcycle missing |1.4.1| | 21 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 20 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 20 |
| Registration plate lamp issues | 14 |
| Steering headbearing has excessive free play |2.2.2| | 14 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 13 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 13 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 12 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 11 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Drive chain worn to excess |6.2.1e| | 9 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 9 |
| Throttle operating incorrectly |6.2.1f| | 7 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 7 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 6 |
| Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 6 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 6 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Drive chain excessively tight |6.2.1d| | 5 |
| Front Steering headbearing has excessive free play |2.2.2| | 5 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 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 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 4 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 4 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Headlamp insecure |1.2.3b| | 4 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 3 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 3 |
| Horn not working |7.7 |a| |ii|| | 3 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Nearside Front Direction indicator not working |1.5.1c| | 3 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Rear reflector missing |4.8.2 |a| |ii|| | 3 |
| Front Position lamp not working (4.2.1 (a)) | 3 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 3 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 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 |
| Front Brake excessively binding (1.2.1 (f)) | 3 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Front position lamp incorrect colour |1.1.2a| | 3 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 2 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 2 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 2 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 2 |
| Brake lever cannot be applied smoothly |3.1.3d| | 2 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 2 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 2 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 2 |
| Horn sounds harsh or grating |1.7.3c| | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Rear Drive chain excessively loose (6.1.7 (c) (i)) | 2 |
| Offside Front Footrest insecure |6.2.1a| | 2 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 2 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 2 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 2 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 2 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 2 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 2 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Steering control has Insufficient clearance at full lock affecting the riders operation of the controls |2.1.2b| | 2 |
| Rear Brake disc|s| has excessive run out |3.2.A1m| | 2 |
| Front Horn not working (7.7 (a) (ii)) | 2 |
| Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Offside Front Direction indicator missing |1.5.1a| | 2 |
| Front Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 2 |
| Horn not working (7.7 (a)) | 2 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Stop lamp does not emit a steady light |1.3.1b| | 2 |
| Rear Stop lamp deteriorated and function impaired |1.3.3a| | 2 |
| Offside Rear Direction indicator not working |1.5.1c| | 2 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 2 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front Horn not working |1.7.3a| | 2 |
| Handlebar deformed |2.1.1b| | 2 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Indicator switch insecure |1.5.4| | 2 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 2 |
| Brake performance not tested |3.3| | 2 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 2 |
| Rear Brake excessively binding (1.2.1 (f)) | 2 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 2 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 2 |
| Rear Brake disc|s| cracked |3.2.A1g| | 2 |
| Rear Brake excessively binding |1.2.1 |f|| | 2 |