| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 79 |
| Drive chain excessively loose |6.2.1d| | 40 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 30 |
| Rear reflector on motorcycle missing |1.4.1| | 30 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 21 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 20 |
| Drive chain worn to excess |6.2.1e| | 16 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 16 |
| Registration plate issues | 14 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 13 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 11 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 11 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 10 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 9 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 8 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 8 |
| Riders seat insecure |6.2.1a| | 8 |
| Throttle operating incorrectly |6.2.1f| | 7 |
| Rear reflector on motorcycle obscured |1.4.1| | 7 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 6 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 6 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Horn not working |1.7.3a| | 6 |
| Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Handlebar deformed |2.1.1b| | 5 |
| Drive chain excessively tight |6.2.1d| | 5 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 5 |
| Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 5 |
| Headlamp aim beam image kick up to the offside |1.6| | 5 |
| Front Brake excessively binding (1.2.1 (f)) | 5 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Rear Drive chain excessively loose |6.2.1d| | 4 |
| Rear Drive chain worn to excess |6.2.1e| | 4 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 4 |
| Direction indicators not working |1.5.1c| | 4 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Brake performance not tested |3.3| | 3 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 3 |
| Front Brake disc|s| cracked |3.2.A1g| | 3 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 3 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 3 |
| Steering headbearing has excessive free play |2.2.2| | 3 |
| Rear reflector on motorcycle obscured |1.4.2b| | 3 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Rear Brake excessively binding (1.2.1 (f)) | 3 |
| Riders seat insecure (6.2.5 (a) (ii)) | 3 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 2 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 2 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 2 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Offside Front Direction indicator not working |1.5.1c| | 2 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 2 |
| Nearside Front Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Nearside Rear Direction indicator not working |1.5.1c| | 2 |
| 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| | 2 |
| Stop lamp remains on when the brakes are released | 2 |
| Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Brake pedal has insufficient reserve travel |1.1.2 |a|| | 2 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 2 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Riders seat insecure |6.2.5 |a| |ii|| | 2 |
| Rear Brake effort inadequate at a wheel |1.2.1 |a| |i|| | 2 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 2 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 2 |
| Offside Rear Direction indicators not working |1.5.1c| | 2 |
| Indicator switch insecure |1.5.4| | 2 |
| Rear reflector on sidecar missing |1.4.1| | 2 |
| Front Brake master cylinder leaking hydraulic fluid |3.2.B1e| | 2 |
| Indicator switch defective |1.5.4| | 2 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 2 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| All direction indicators not working (4.4.1 (a) (ii)) | 2 |
| Throttle control functioning such that safe operation of the motorcycle is adversely affected (6.2.7 (a) (ii)) | 2 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 2 |
| Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 2 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Front Position lamp not working (4.2.1 (a)) | 2 |
| Rear Position lamp not working (4.2.1 (a)) | 2 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 2 |