| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 146 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 66 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 66 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 66 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 64 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 41 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 38 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 38 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 36 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 34 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 31 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 30 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 23 |
| Horn not working |1.7.3a| | 22 |
| Steering headbearing has excessive free play |2.2.2| | 21 |
| Nearside Rear Direction indicator not working |1.5.1c| | 20 |
| Registration plate issues | 19 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 19 |
| Riders seat insecure |6.2.1a| | 18 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 18 |
| Exhaust excessively deteriorated |7.1.1a| | 17 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 16 |
| Offside Rear Direction indicator not working |1.5.1c| | 15 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Nearside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 14 |
| Headlamp switch faulty |1.2.4| | 14 |
| Indicator switch defective |1.5.4| | 13 |
| Throttle operating incorrectly |6.2.1f| | 12 |
| Offside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 11 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 10 |
| Rear reflector on motorcycle missing |1.4.1| | 10 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 10 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 9 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 9 |
| Nearside Rear Direction indicators not working |1.5.1c| | 8 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 8 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 8 |
| Offside Rear Direction indicators not working |1.5.1c| | 7 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 7 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 7 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Front wheel bearings have excessive free play |2.3.5b| | 7 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 6 |
| Nearside Front Direction indicator not working |1.5.1c| | 6 |
| Offside Front Direction indicator not working |1.5.1c| | 6 |
| Front Steering headbearing has excessive free play |2.2.2| | 6 |
| Rear Position lamp not working (4.2.1 (a)) | 6 |
| Nearside Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Front wheel bearings are excessively rough |2.3.5b| | 6 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 6 |
| Offside Front Brake disc|s| excessively worn |3.2.A1l| | 6 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 6 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 6 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 6 |
| Rear suspension bush excessively deteriorated |2.4.A2a|i|| | 6 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 5 |
| Offside Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 5 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 5 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 5 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 5 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 5 |
| Rear Brake lever has insufficient reserve travel (1.1.2 (a)) | 5 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 4 |
| Front mudguard insecure |2.3.7| | 4 |
| Offside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 4 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 4 |
| Direction indicators not working |1.5.1c| | 4 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Nearside Rear suspension component cracked |2.4.A.1a| | 4 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Offside Rear Position lamp not working |4.2.1 |a|| | 4 |
| Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Registration plate lamp issues | 4 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Nearside Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 4 |
| Headlamp aim not tested |1.6| | 4 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Rear Brake disc|s| has excessive run out |3.2.A1m| | 4 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Indicator tell tale not operating correctly |1.5.2| | 3 |
| Offside Front Brake disc|s| has excessive run out |3.2.A1m| | 3 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 3 |
| Nearside Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Nearside Direction indicator flashing more than 120 times per minute |1.5.1c| | 3 |
| Steering movement excessively rough with the weight on the lower bearing |2.2.1a| | 3 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 3 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 3 |
| Offside Front Brake disc|s| excessively scored |3.2.A1l| | 3 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Nearside Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| All direction indicators not working (4.4.1 (a) (ii)) | 3 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Front 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 |
| Front Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 3 |
| Offside Rear Upper Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Rear Steering linkage has excessive free play |2.2.2| | 3 |
| Rear Wheel fixing loose (single fixing) (5.2.1 (a) (ii)) | 3 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Front Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 3 |
| Front Roller brake test indicates a severely juddering brake |3.3.A1b| | 3 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 3 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 3 |
| Front Riders seat insecure |6.2.1a| | 3 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Offside Front Direction indicators not working |1.5.1c| | 3 |
| Riders seat insecure (6.2.5 (a) (ii)) | 3 |