| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 62 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 47 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 47 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 39 |
| Drive chain excessively loose |6.2.1d| | 26 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 25 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 22 |
| Steering headbearing has excessive free play |2.2.2| | 19 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 17 |
| Registration plate issues | 17 |
| Drive chain worn to excess |6.2.1e| | 15 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 14 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 12 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 11 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 11 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 10 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 7 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 7 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 7 |
| Headlamp aim beam image kick up to the offside |1.6| | 7 |
| Horn not working |1.7.3a| | 7 |
| Drive chain excessively tight |6.2.1d| | 6 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 6 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 6 |
| Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 5 |
| Throttle operating incorrectly |6.2.1f| | 5 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 5 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Rear Drive chain excessively loose |6.2.1d| | 4 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 4 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Indicator switch insecure |1.5.4| | 4 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Brake pedal pivots excessively worn |3.1.3a| | 4 |
| Rear Position lamp not working (4.2.1 (a)) | 4 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Rear Hydraulic brake control feels spongy |3.1.4a| | 3 |
| Rear Footrest missing |6.2.1a| | 3 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 3 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Handlebar deformed |2.1.1b| | 3 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Front Brake excessively binding |1.2.1 |f|| | 3 |
| Rear shock absorber insecurely mounted |2.4.A.3b| | 3 |
| Stop lamp remains on when the brakes are released | 3 |
| Riders seat insecure |6.2.1a| | 3 |
| Rear Wheel spoke excessively loose |4.2.1b| | 3 |
| Offside Rear Direction indicator not working |1.5.1c| | 3 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 3 |
| Horn not working |7.7 |a| |ii|| | 3 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 3 |
| Registration plate lamp issues | 3 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 3 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 2 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 2 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 2 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Offside Rear Footrest insecure |6.2.1a| | 2 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 2 |
| Fuel system component leaking |7.2.1a| | 2 |
| Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Front Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 2 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 2 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Offside Rear Direction indicator insecure |1.5.3b| | 2 |
| Headlamp switch insecure |1.2.4| | 2 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 2 |
| Rear Brake pedal insecure |3.1.2a| | 2 |
| Rear Stop lamp does not emit a steady light |1.3.1b| | 2 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 2 |
| Front Steering headbearing has excessive free play |2.2.2| | 2 |
| Rear Shock absorber has negligible damping effect |5.3.2 |b|| | 2 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Offside Rear Drive chain excessively loose |6.2.1d| | 2 |
| Brake pedal insecure |3.1.2a| | 2 |
| Stop lamp insecure |1.3.3b| | 2 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 2 |
| Rear position lamp insecure |1.1.1c| | 2 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 2 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 2 |
| 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| | 2 |
| Nearside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 2 |
| Front Position lamp not working |4.2.1 |a|| | 2 |
| Lower Rear mono-shock pivot excessively worn |2.4.B.4| | 2 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 2 |
| Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 2 |
| Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Headlamp aim not tested (4.1.2 (b)) | 2 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 2 |
| Steering operation fouling on the fuel tank or bodywork on full lock (2.1.4 (b)) | 2 |
| Rear Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 2 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 2 |