| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 99 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 86 |
| Horn not working |1.7.3a| | 51 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 41 |
| Rear reflector on motorcycle missing |1.4.1| | 38 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 36 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 35 |
| Registration plate issues | 35 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 33 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 32 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 32 |
| Steering headbearing has excessive free play |2.2.2| | 31 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 28 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 27 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 23 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 21 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 21 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 20 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 16 |
| Stop lamp remains on when the brake is released |1.3.1e| | 13 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 12 |
| Rear reflector missing (4.8.2 (a) (ii)) | 11 |
| Horn not working (7.7 (a) (ii)) | 11 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 11 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 10 |
| Rear Shock absorber has negligible damping effect |5.3.2 |b|| | 10 |
| Direction indicators not working |1.5.1c| | 10 |
| Horn not working |7.7 |a| |ii|| | 10 |
| Stop lamp remains on when the brakes are released | 10 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 9 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 9 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 9 |
| Nearside Front Direction indicator not working |1.5.1c| | 8 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 8 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 8 |
| Offside Front Direction indicator not working |1.5.1c| | 8 |
| Headlamp aim not tested |1.6| | 8 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Rear Brake lever has insufficient reserve travel |1.1.2 |a|| | 8 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 7 |
| Front Brake excessively binding (1.2.1 (f)) | 7 |
| Rear reflector missing |4.8.2 |a| |ii|| | 7 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Riders seat insecure |6.2.1a| | 7 |
| Indicator switch defective |1.5.4| | 6 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 6 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 6 |
| Rear Position lamp not working (4.2.1 (a)) | 6 |
| Registration plate lamp issues | 6 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Offside Front Direction indicators not working |1.5.1c| | 6 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 6 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 6 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 6 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Front suspension has inadequate damping effect. |2.3.6c| | 5 |
| Brake lever has inadequate reserve travel |3.1.3b| | 5 |
| Headlamp aim not tested (4.1.2 (b)) | 5 |
| Front Horn not working |1.7.3a| | 5 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 5 |
| All direction indicators not working (4.4.1 (a) (ii)) | 5 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 5 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 5 |
| Front Direction indicators not working |1.5.1c| | 5 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 5 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 5 |
| Exhaust excessively deteriorated |7.1.1a| | 5 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 5 |
| Rear Brake lever has insufficient reserve travel (1.1.2 (a)) | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Nearside Front Direction indicator not working |4.4.1 |a| |ii|| | 4 |
| Nearside Rear Direction indicator not working |1.5.1c| | 4 |
| Nearside Direction indicators not working |1.5.1c| | 4 |
| Nearside Front Direction indicators not working |1.5.1c| | 4 |
| Rear Brake lever insecure |3.1.2a| | 4 |
| Position lamp showing white light to the rear (4.2.3 (a) (ii)) | 4 |
| Rear Position lamp not working |4.2.1 |a|| | 4 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Headlamp damaged and function impaired |1.2.3a| | 3 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 3 |
| Front Steering headbearing has excessive free play |2.2.2| | 3 |
| Rear Direction indicators not working |1.5.1c| | 3 |
| Front Horn not working (7.7 (a) (ii)) | 3 |
| Front Stop lamp does not emit a steady light |1.3.1b| | 3 |
| Rear All position lamps do not illuminate immediately when switched on |1.1.3a| | 3 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 3 |
| Fuel pipe leaking |7.2.1a| | 3 |
| Rear Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 3 |
| Nearside Steering lock stop missing |2.1.3| | 3 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 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 wheel bearings have excessive free play |2.3.5b| | 3 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 3 |
| Front Brake excessively binding |1.2.1 |f|| | 3 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 3 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 3 |
| Steering lock stop ineffective |2.1.3| | 3 |
| All direction indicators adversely affected by the operation of another lamp (4.4.3 (b)) | 3 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 3 |
| Fuel system component leaking |7.2.1a| | 3 |
| Headlamp switch faulty |1.2.4| | 3 |
| Rear Direction indicator not working |1.5.1c| | 3 |
| All direction indicators not working |4.4.1 |a| |ii|| | 3 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Nearside Steering lock stop ineffective |2.1.3| | 3 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 3 |
| Offside Steering lock stop ineffective |2.1.3| | 3 |
| Front Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 3 |