| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 21 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 11 |
| Steering headbearing has excessive free play |2.2.2| | 9 |
| Horn not working |1.7.3a| | 7 |
| Registration plate issues | 7 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 4 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 4 |
| Drive chain excessively loose |6.2.1d| | 4 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 3 |
| Drive chain worn to excess |6.2.1e| | 3 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Front Wheel spoke excessively loose |4.2.1b| | 3 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Rear Wheel spoke excessively loose |4.2.1b| | 3 |
| Rear reflector on motorcycle missing |1.4.1| | 3 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Centre Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 2 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Front Steering headbearing has excessive free play |2.2.2| | 2 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 2 |
| Offside Rear Footrest missing |6.2.1a| | 2 |
| Brake lever insecure |3.1.2a| | 2 |
| Throttle operating incorrectly |6.2.1f| | 2 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 2 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Offside Front Direction indicator not working |1.5.1c| | 2 |
| Rear Footrest missing |6.2.1a| | 2 |
| Nearside Rear Direction indicator not working |1.5.1c| | 2 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 2 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 2 |
| Rear position lamp incorrect colour |1.1.2b| | 2 |
| Direction indicators not working |1.5.1c| | 1 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 1 |
| Rear Lower Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Fuel system component insecure |7.2.1b| | 1 |
| Stop lamp not working Not working off rear brake switch. (4.3.1 (a) (ii)) | 1 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 1 |
| Front Wheel bearing has excessive play |5.1.3 |a| |i|| | 1 |
| Rear reflector missing |4.8.2 |a| |ii|| | 1 |
| Front Headlamp insecure (4.1.1 (c)) | 1 |
| Rear Brake excessively binding (1.2.1 (f)) | 1 |
| Front Position lamp not working (4.2.1 (a)) | 1 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 1 |
| Nearside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Nearside Front Direction indicator not working |1.5.1c| | 1 |
| Rear Brake master cylinder insecurely mounted |3.2.B1a| | 1 |
| Upper Stop lamp affected by the operation of another lamp |1.3.2| | 1 |
| Central Rear Position lamp not working (4.2.1 (a)) | 1 |
| Offside Rear Direction indicator incorrect colour |4.4.3 |a|| | 1 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 1 |
| Nearside Front Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 1 |
| Stop lamp not working of front brake lever |4.3.1 |a| |ii|| | 1 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 1 |
| Rear Wheel spindle or securing nut|s| so insecure that wheel security or steering control is adversely affected |5.2.1 |c| |ii|| | 1 |
| Rear Wheel fixing loose |single fixing| locking nut has no locking device |5.2.1 |a| |ii|| | 1 |
| Rear Wheel bearing play so excessive it is likely to break up |5.1.3 |a| |ii|| | 1 |
| Rear Lower Shock absorber has an excessively worn bush |5.3.2 |c|| | 1 |
| Rear Lower Suspension rod ball joint excessively worn link arm |5.3.4 |a| |i|| | 1 |
| Front Brake disc|s| is excessively distorted |3.2.A1m| | 1 |
| Front Brake disc|s| cracked |3.2.A1g| | 1 |
| Front Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 1 |
| Centre Lower Rear suspension bearing has excessive free play |2.4.A2a|i|| | 1 |
| Centre Lower Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 1 |
| Nearside Rear Footrest missing |6.2.1a| | 1 |
| Headlamp aim beam image kick up to the offside |1.6| | 1 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 1 |
| Rear suspension component loose |2.4.A.1a| | 1 |
| Brake lever is positioned so that the brake cannot be readily applied fowling switch gear |3.1.3c| | 1 |
| Exhaust excessively deteriorated |7.1.1a| | 1 |
| Nearside Handlebar mounting clamp bolt missing |2.1.1a| | 1 |
| Gradient brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.D1b| | 1 |
| Nearside Front Direction indicators not working |1.5.1c| | 1 |
| Nearside Rear Direction indicators flashing less than 60 times a minute |1.5.1c| | 1 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Rear Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 1 |
| Rear Direction indicator missing |1.5.1a| | 1 |
| Front Indicator tell tale not operating correctly |1.5.2| | 1 |
| Front Handlebar deformed |2.1.1b| | 1 |
| Front Direction indicators flashing less than 60 times a minute |1.5.1c| | 1 |
| Rear Direction indicators flashing less than 60 times a minute |1.5.1c| | 1 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Front position lamp incorrect colour |1.1.2a| | 1 |
| Nearside Front Direction indicator insecure |1.5.3b| | 1 |
| Rear Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 1 |
| Rear wheel spindle securing nut|s| loose |2.4.A.2b| | 1 |
| Front wheel spindle securing nut locking device insecure |2.3.3a| | 1 |
| Front position lamp deteriorated and function impaired |1.1.1b| | 1 |
| Stop lamp deteriorated and function impaired |1.3.3a| | 1 |
| Nearside Direction indicators not working |1.5.1c| | 1 |
| Offside Direction indicators not working |1.5.1c| | 1 |
| Headlamp switch insecure |1.2.4| | 1 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 1 |
| Fuel hose leaking |7.2.1a| | 1 |
| Indicator tell tale not functioning |1.5.2| | 1 |
| Offside Rear Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Rear Brake pedal attachment screws loose |3.1.2b| | 1 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Rear Wheel spoke excessively corroded |4.2.1b| | 1 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 1 |
| Rear Wheel fractured significantly reducing the original strength |4.2.1a| | 1 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Rear Rear wheel bearings are excessively rough |2.4.A.2c| | 1 |
| Horn control not functioning. |1.7.2b| | 1 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Offside Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Centre Front Upper Steering headbearing has excessive free play |2.2.2| | 1 |
| Centre Front Upper Fork yoke deformed |2.1.1b| | 1 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 1 |
| Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 1 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 1 |
| Stop lamp emits other than a steady red light |1.3.1b| | 1 |
| Front mudguard insecure |2.3.7| | 1 |
| Rear Brake master cylinder has an excessively worn master cylinder pivot. |3.2.B5| | 1 |
| Rear Chain guard insecure |6.2.1c| | 1 |
| Rear Brake cylinder insecurely mounted |3.2.B1a| | 1 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 1 |
| Centre Rear reflector on motorcycle missing |1.4.1| | 1 |
| Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Direction indicator not working |1.5.1c| | 1 |
| Direction indicator insecure |1.5.3b| | 1 |
| Rear Rear position lamp insecure |1.1.1c| | 1 |
| Offside Rear Direction indicator insecure |1.5.3b| | 1 |
| Position lamp switch insecure |1.1.4b| | 1 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 1 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 1 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 1 |
| Front Front wheel spindle loose |2.3.3a| | 1 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 1 |
| Offside Front Direction indicators not working |1.5.1c| | 1 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 1 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Offside Direction indicator not working |1.5.1c| | 1 |
| Front wheel spindle securing nut|s| loose |2.3.5a| | 1 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 1 |