| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 90 |
| Handlebar mounting excessively deteriorated |flexible type| |2.1.1d| | 76 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 66 |
| Drive chain excessively loose |6.2.1d| | 59 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 58 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 47 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 45 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 44 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 43 |
| Drive chain worn to excess |6.2.1e| | 35 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 33 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 32 |
| Riders seat insecure |6.2.1a| | 29 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 29 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 28 |
| Handlebar mounting clamp loose |2.1.1a| | 28 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 27 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 26 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 25 |
| Registration plate issues | 24 |
| Rear reflector on motorcycle missing |1.4.1| | 24 |
| Front wheel bearings have excessive free play |2.3.5b| | 22 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 22 |
| Rear Wheel spoke excessively loose |4.2.1b| | 20 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 20 |
| Headlamp aim beam image kick up to the offside |1.6| | 20 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 18 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 18 |
| Chain guard insecure |6.2.1c| | 17 |
| Steering headbearing has excessive free play |2.2.2| | 15 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 15 |
| Front Wheel spoke excessively loose |4.2.1b| | 15 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 14 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 13 |
| Nearside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 12 |
| Drive chain excessively tight |6.2.1d| | 12 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 12 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 12 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 10 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 10 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Offside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 10 |
| Throttle operating incorrectly |6.2.1f| | 10 |
| Rear Wheel spoke cracked. |4.2.1b| | 9 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 9 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 9 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Rear Wheel spoke missing |4.2.1b| | 9 |
| Front Handlebar mounting excessively deteriorated |flexible type| |2.1.1d| | 9 |
| Registration plate lamp issues | 9 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 9 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 8 |
| Front wheel bearings are excessively rough |2.3.5b| | 8 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 8 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 8 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 7 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Headlamp insecure |1.2.3b| | 7 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 7 |
| Horn not working |1.7.3a| | 7 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 7 |
| Nearside Rear Footrest insecure |6.2.1a| | 6 |
| Rear Drive chain excessively loose |6.2.1d| | 6 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 6 |
| Nearside Rear Direction indicator not working |1.5.1c| | 5 |
| Nearside Rear Footrest missing |6.2.1a| | 5 |
| Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Front Steering lock stop missing |2.1.3| | 5 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 5 |
| Nearside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 5 |
| Offside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 5 |
| 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| | 5 |
| Offside Front Direction indicator insecure |1.5.3b| | 5 |
| An item not tested |Manual| | 5 |
| Offside Front Direction indicator not working |1.5.1c| | 5 |
| Headlamp aim not tested |1.6| | 4 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Front Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 4 |
| Nearside Rear Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 4 |
| Nearside Handlebar mounting clamp bolt loose |2.1.1a| | 4 |
| Offside Steering lock stop ineffective |2.1.3| | 4 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Front Steering headbearing has excessive free play |2.2.2| | 4 |
| Handlebar deformed |2.1.1b| | 4 |
| Nearside Front Direction indicator insecure |1.5.3b| | 4 |
| Offside Rear Footrest insecure |6.2.1a| | 3 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Offside Rear Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Drive chain so loose it is likely to fail (6.1.7 (c) (ii)) | 3 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |
| Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Offside Rear Footrest missing |6.2.1a| | 3 |
| Offside Rear Direction indicator insecure |1.5.3b| | 3 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 3 |
| Offside Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 3 |
| Fuel cap mounting flange/sealing method defective |7.2.2c| | 3 |
| Nearside Front Footrest insecure |6.2.1a| | 3 |
| Offside Rear Direction indicator not working |1.5.1c| | 3 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Front Riders seat insecure |6.2.1a| | 3 |
| Direction indicators not working |1.5.1c| | 3 |
| Front Handlebar mounting clamp bolt loose |2.1.1a| | 3 |
| Offside Handlebar mounting clamp bolt loose |2.1.1a| | 3 |
| Nearside Rear suspension bush has excessive free play |2.4.A2a|i|| | 3 |
| Offside Rear suspension bush has excessive free play |2.4.A2a|i|| | 3 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 3 |
| Front Hydraulic brake control creeps under load. |3.1.4a| | 3 |
| Front suspension has inadequate damping effect. |2.3.6c| | 3 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 3 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 3 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 3 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 3 |
| Wheel spoke excessively loose |4.2.1b| | 3 |
| Headlamp switch faulty |1.2.4| | 3 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 3 |
| Front Brake component is excessively corroded |3.1.5| | 3 |
| Rear Drive chain worn to excess |6.2.1e| | 3 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 3 |
| Front Fairings insecure and likely to impede the steering |2.1.2e| | 3 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Rear Rear suspension bearing has excessive free play |2.4.A2a|i|| | 3 |
| Offside Rear Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 3 |