| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 24 |
| Steering headbearing has excessive free play |2.2.2| | 9 |
| Horn not working |1.7.3a| | 9 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 6 |
| Fuel system component leaking |7.2.1a| | 5 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 5 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Offside Rear Direction indicator not working |1.5.1c| | 4 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Throttle operating incorrectly |6.2.1f| | 3 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Nearside Rear Direction indicator not working |1.5.1c| | 3 |
| Offside Front Direction indicators not working |1.5.1c| | 3 |
| Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Rear Wheel spoke excessively loose |4.2.1b| | 2 |
| Rear reflector on motorcycle missing |1.4.1| | 2 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 2 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Offside Footrest insecure |6.2.1a| | 2 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 2 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Fuel cap sealing washer missing |7.2.2c| | 2 |
| Riders seat insecure |6.2.1a| | 2 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 2 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Drive chain excessively loose |6.2.1d| | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 2 |
| Offside Front Brake locking device missing |3.2.A1e| | 2 |
| Front Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 2 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 2 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Horn missing |1.7.1| | 2 |
| Drive chain worn to excess |6.2.1e| | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 1 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 1 |
| Front Brake locking device insecure |3.2.A1e| | 1 |
| Rear Brake component defective due to a deliberate modification which significantly reduces the original strength |3.1.5| | 1 |
| Rear Chain guard fouling another component |6.2.1c| | 1 |
| Rear Drive chain worn to excess |6.2.1e| | 1 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 1 |
| Dipswitch does not deflect the main beam/s, making them into dipped beam/s |1.2.2b|ii|| | 1 |
| Front Headlamp aim not tested |1.6| | 1 |
| Front Horn not working |1.7.3a| | 1 |
| Nearside Rear Drive chain fouling another component |6.2.1d| | 1 |
| Offside Exhaust mounting missing |7.1.1c| | 1 |
| Handlebar mounting excessively deteriorated |flexible type| |2.1.1d| | 1 |
| 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| | 1 |
| Plate brake test No brake control achieves an efficiency of 30%. |3.3.B2a| | 1 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Brake master cylinder leaking hydraulic fluid |3.2.B1e| | 1 |
| Front position lamp does not face the front |1.1.1d| | 1 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 1 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 1 |
| Brake lever attachment screws loose |3.1.2b| | 1 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Front Upper Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 1 |
| Nearside Front Footrest insecure |6.2.1a| | 1 |
| Fuel pipe leaking |7.2.1a| | 1 |
| Front Brake lever mounting insecure |3.1.2a| | 1 |
| Nearside Steering lock stop ineffective |2.1.3| | 1 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Offside Rear Upper Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 1 |
| Nearside Rear Upper Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 1 |
| Brake lever has inadequate reserve travel |3.1.3b| | 1 |
| Nearside Rear Brake locking device missing |3.2.A1e| | 1 |
| Nearside Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 1 |
| Headlamp insecure |1.2.3b| | 1 |
| Front Brake lever insecure |3.1.2a| | 1 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 1 |
| Brake locking device missing |3.2.A1e| | 1 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Steering lock stop ineffective |2.1.3| | 1 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Offside Rear Direction indicators not working |1.5.1c| | 1 |
| Offside Front Direction indicator insecure |1.5.3b| | 1 |
| Offside Rear Direction indicators affected by the operation of another lamp |1.5.1c| | 1 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride front fork yokes |6.2.1h| | 1 |
| Offside Front Steering lock stop ineffective |2.1.3| | 1 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 1 |
| Offside Front Steering control handlebar movement restricted by cables caught on a projection |2.1.2c| | 1 |
| Nearside Direction indicator not working |1.5.1c| | 1 |
| Fuel cap sealing washer deteriorated |7.2.2c| | 1 |
| Footrest insecure |6.2.1a| | 1 |
| Rear wheel rotation likely to be impeded |6.2.1b| | 1 |
| Offside Exhaust excessively deteriorated |7.1.1a| | 1 |
| Nearside Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Centre Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Front All position lamps do not illuminate immediately when switched on |1.1.3a| | 1 |
| Rear All position lamps do not illuminate immediately when switched on |1.1.3a| | 1 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 1 |
| Centre Rear Lower Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 1 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 1 |
| Rear wheel has a loose wheel nut|s| |4.2.3a| | 1 |
| Brake lever has inadequate reserve travel front brake |3.1.3b| | 1 |
| Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 1 |
| An item not tested |Manual| | 1 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 1 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 1 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 1 |
| Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 1 |
| Rear Brake pedal is positioned so that the brake cannot be readily applied |3.1.3c| | 1 |
| Rear position lamp deteriorated and function impaired |1.1.1b| | 1 |
| Rear wheel spindle loose |2.4.A.2b| | 1 |
| Fuel system component insecure |7.2.1b| | 1 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Steering lock stop maladjusted |2.1.3| | 1 |
| Front Brake cable badly frayed |3.2.A1b| | 1 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Nearside Footrest insecure (6.2.12 (a)) | 1 |