| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 117 |
| Rear reflector on motorcycle missing |1.4.1| | 67 |
| Drive chain excessively loose |6.2.1d| | 41 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 32 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 31 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 29 |
| Drive chain worn to excess |6.2.1e| | 26 |
| Registration plate issues | 26 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 25 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 21 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 20 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 20 |
| Horn not working |1.7.3a| | 18 |
| Rear Wheel spoke excessively loose |4.2.1b| | 17 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 15 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 14 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 14 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 13 |
| Front Wheel spoke excessively loose |4.2.1b| | 12 |
| Drive chain excessively tight |6.2.1d| | 12 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 11 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 11 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 11 |
| Brake hose excessively deteriorated | 11 |
| Rear Direction indicator incorrect colour |1.5.1b| | 11 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 10 |
| Offside Rear Footrest missing |6.2.1a| | 10 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 10 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 10 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 9 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 9 |
| Front Direction indicator incorrect colour |1.5.1b| | 9 |
| Direction indicator incorrect colour |1.5.1b| | 9 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 9 |
| Headlamp aim beam image kick up to the offside |1.6| | 8 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 8 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 7 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 7 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 7 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 7 |
| Nearside Rear Footrest missing |6.2.1a| | 7 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 6 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 6 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 6 |
| Offside Rear Direction indicators not working |1.5.1c| | 6 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 6 |
| Rear Footrest missing |6.2.1a| | 6 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 6 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 6 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 6 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 6 |
| Steering headbearing has excessive free play |2.2.2| | 6 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 6 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 6 |
| Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Rear Wheel spoke cracked. |4.2.1b| | 5 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 5 |
| Nearside Front Direction indicators not working |1.5.1c| | 5 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 5 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 5 |
| Throttle operating incorrectly |6.2.1f| | 5 |
| Riders seat insecure |6.2.1a| | 5 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 5 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 5 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 4 |
| Rear Brake locking device missing |3.2.A1e| | 4 |
| Direction indicators not working |1.5.1c| | 4 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 4 |
| Rear Brake locking device insecure |3.2.A1e| | 4 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 4 |
| Brake performance not tested |3.3| | 4 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 4 |
| Offside Front Direction indicators not working |1.5.1c| | 4 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 4 |
| Rear wheel rotation likely to be impeded |6.2.1b| | 4 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 4 |
| Headlamp insecure |1.2.3b| | 4 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 3 |
| Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 3 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 3 |
| Nearside Front Direction indicator not working |1.5.1c| | 3 |
| Offside Front Footrest insecure |6.2.1a| | 3 |
| Brake hose damaged | 3 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 3 |
| Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Headlamp switch faulty |1.2.4| | 3 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 3 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 3 |
| 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| | 3 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Offside Rear Direction indicator not working |1.5.1c| | 3 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 3 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Rear Direction indicators not working |1.5.1c| | 3 |
| Stop lamp affected by the operation of the horn |1.3.2| | 3 |
| Nearside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Rear Wheel spoke missing |4.2.1b| | 3 |
| Chain guard insecure |6.2.1c| | 3 |
| Front suspension has inadequate damping effect. |2.3.6c| | 3 |
| Rear position lamp incorrect colour |1.1.2b| | 2 |
| Rear Stop lamp affected by the operation of another lamp |1.3.2| | 2 |
| Rear Rear suspension bearing has excessive free play |2.4.A2a|i|| | 2 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 2 |
| Fuel cap sealing washer deteriorated |7.2.2c| | 2 |
| Drive chain fouling another component |6.2.1d| | 2 |
| Front Brake caliper|s| insecure |3.2.A1j| | 2 |
| Front Position lamp switch insecure |1.1.4b| | 2 |
| Direction indicator affected by the operation of another lamp |1.5.1c| | 2 |
| Brake pedal anti-slip provision missing |1.1.2 |c|| | 2 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 2 |
| Front Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 2 |
| Brake pedal is positioned so that the brake cannot be readily applied |3.1.3c| | 2 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 2 |
| Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Rear Drive chain worn to excess |6.2.1e| | 2 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 2 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 2 |
| Offside Footrest insecure |6.2.1a| | 2 |
| Stop lamp emits other than a steady red light |1.3.1b| | 2 |
| Handlebar deformed |2.1.1b| | 2 |
| Front suspension assembly component excessively misaligned |2.3.1| | 2 |
| Rear Footrest insecure |6.2.1a| | 2 |
| Rear Direction indicator affected by the operation of another lamp |1.5.1c| | 2 |
| Nearside Rear Lower Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Rear Exhaust mounting missing |7.1.1c| | 2 |
| Fuel cap does not fasten securely by a positive means |7.2.2b| | 2 |
| Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Rear Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Nearside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Offside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Front Steering headbearing has excessive free play |2.2.2| | 2 |
| Rear Drive chain excessively loose |6.2.1d| | 2 |
| Front position lamp adversely affected by the operation of another lamp |1.1.3b| | 2 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 2 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 2 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 2 |
| Rear Wheel has an excessively distorted bead rim. |4.2.2| | 2 |
| Nearside Rear Direction indicator not working |1.5.1c| | 2 |
| Horn control defective |1.7.2a| | 2 |
| Indicator switch insecure |1.5.4| | 2 |
| Position lamp switch insecure |1.1.4b| | 2 |
| Brake reaction bracket insecure |3.2.A1j| | 2 |
| Steering control handlebar movement restricted by trapped cables |2.1.2c| | 2 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Rear Rear suspension component loose |2.4.A.1a| | 2 |
| Headlamp aim not tested |1.6| | 2 |
| Nearside Steering lock stop missing |2.1.3| | 2 |
| Offside Steering lock stop missing |2.1.3| | 2 |
| Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 2 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 2 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 2 |
| Fuel system component leaking |7.2.1a| | 2 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Direction indicator flashing less than 60 times a minute |1.5.1c| | 2 |
| Exhaust excessively deteriorated |7.1.1a| | 2 |
| Centre Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Offside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Rear Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 2 |
| Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Drive chain horseshoe locking device incorrectly fitted |6.1.7 |j| |i|| | 2 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Central Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |