| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 74 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 37 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 36 |
| Horn not working |1.7.3a| | 27 |
| Drive chain excessively loose |6.2.1d| | 26 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 25 |
| Steering headbearing has excessive free play |2.2.2| | 22 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 22 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 19 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 19 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 18 |
| Registration plate issues | 17 |
| Throttle operating incorrectly |6.2.1f| | 16 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 14 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 13 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 12 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 11 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 11 |
| Rear Brake disc|s| has excessive run out |3.2.A1m| | 10 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 10 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 10 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 10 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 10 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Drive chain worn to excess |6.2.1e| | 8 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 8 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 8 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 8 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 7 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 7 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 7 |
| Headlamp aim beam image kick up to the offside |1.6| | 7 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 7 |
| Front wheel bearings have excessive free play |2.3.5b| | 7 |
| Drive chain excessively tight |6.2.1d| | 6 |
| Rear Drive chain worn to excess |6.2.1e| | 6 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 6 |
| Handlebar deformed |2.1.1b| | 6 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 6 |
| Nearside Rear Footrest missing |6.2.1a| | 5 |
| Rear Brake disc|s| is excessively distorted |3.2.A1m| | 5 |
| Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 5 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 4 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 4 |
| Offside Front Direction indicators not working |1.5.1c| | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Front Steering headbearing has excessive free play |2.2.2| | 4 |
| Nearside Rear Footrest insecure |6.2.1a| | 4 |
| Riders seat insecure |6.2.1a| | 4 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 4 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Offside Rear Direction indicators not working |1.5.1c| | 3 |
| Brake pedal is inoperative |3.1.3c| | 3 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 3 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Rear Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 3 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Front Position lamp not working (4.2.1 (a)) | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Chain guard insecure |6.2.1c| | 3 |
| Offside Front Direction indicator insecure |1.5.3b| | 3 |
| Horn not working |7.7 |a| |ii|| | 3 |
| Rear position lamp insecure |1.1.1c| | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 3 |
| Nearside Rear Direction indicator not working |1.5.1c| | 3 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Nearside Front Footrest insecure |6.2.1a| | 2 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 2 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 2 |
| Front Stop lamp does not emit a steady light |1.3.1b| | 2 |
| Front Position lamp not working |4.2.1 |a|| | 2 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Front Brake disc|s| cracked |3.2.A1g| | 2 |
| Offside Rear Direction indicator insecure |1.5.3b| | 2 |
| Front Roller brake test indicates a severely juddering brake |3.3.A1b| | 2 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 2 |
| Fuel hose leaking |7.2.1a| | 2 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 2 |
| Front Wheel has an excessively eccentric bead rim. |4.2.2| | 2 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 2 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 2 |
| Stop lamp damaged and function impaired |1.3.3a| | 2 |
| Stop lamp remains on when the brakes are released | 2 |
| Steering control handlebar movement restricted by taut cables |2.1.2c| | 2 |
| Front Horn not working |1.7.3a| | 2 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 2 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 2 |
| Rear Exhaust excessively deteriorated |7.1.1a| | 2 |
| Front Brake lever is positioned so that the brake cannot be readily applied |3.1.3c| | 2 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 2 |
| Offside Rear Direction indicator incorrect colour (4.4.3 (a)) | 2 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 2 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 2 |
| Rear Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 2 |
| Exhaust mounting missing |7.1.1c| | 2 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 2 |
| Offside Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 2 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 2 |
| Nearside Front Lower Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Brake hose damaged | 2 |
| Headlamp insecure |1.2.3b| | 2 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 2 |