| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 162 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 69 |
| Registration plate issues | 50 |
| Drive chain excessively loose |6.2.1d| | 46 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 40 |
| Horn not working |1.7.3a| | 34 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 34 |
| Drive chain worn to excess |6.2.1e| | 33 |
| Rear reflector on motorcycle missing |1.4.1| | 32 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 30 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 30 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 26 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 25 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 25 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 22 |
| Front wheel bearings are excessively rough |2.3.5b| | 22 |
| Registration plate lamp issues | 21 |
| Drive chain excessively tight |6.2.1d| | 21 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 21 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 21 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 21 |
| Steering headbearing has excessive free play |2.2.2| | 19 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 17 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 13 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 13 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 13 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 11 |
| Brake lever has inadequate reserve travel |3.1.3b| | 10 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 10 |
| Throttle operating incorrectly |6.2.1f| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 10 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 10 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 10 |
| Front Brake excessively binding (1.2.1 (f)) | 10 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Headlamp aim beam image kick up to the offside |1.6| | 10 |
| 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| | 10 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 10 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 9 |
| Nearside Front Direction indicator not working |1.5.1c| | 9 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 9 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 9 |
| Front wheel bearings have excessive free play |2.3.5b| | 9 |
| Exhaust excessively deteriorated |7.1.1a| | 9 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Nearside Rear Direction indicators not working |1.5.1c| | 8 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 8 |
| Offside Handlebar deformed |2.1.1b| | 8 |
| Lower Rear suspension bush has excessive free play |2.4.A2a|i|| | 8 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 8 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 7 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 7 |
| Nearside Front Roller brake test indicates a binding brake |3.3.A1a| | 7 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 7 |
| Front Brake excessively binding |1.2.1 |f|| | 6 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 6 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 6 |
| Offside Front Roller brake test indicates a binding brake |3.3.A1a| | 6 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Rear Brake excessively binding (1.2.1 (f)) | 6 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 5 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 5 |
| Rear Drive chain worn to excess |6.2.1e| | 5 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 5 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 5 |
| Front Position lamp not working (4.2.1 (a)) | 5 |
| Horn not working (7.7 (a) (ii)) | 5 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 5 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 5 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 5 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 4 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 4 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 4 |
| Hydraulic brake control feels spongy |3.1.4a| | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Rear Brake pedal anti-slip provision missing (1.1.2 (c)) | 4 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 4 |
| Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 4 |
| Front Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 4 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 4 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 4 |
| Front Horn not working |1.7.3a| | 4 |
| Nearside Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Offside Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 4 |
| Stop lamp remains on when the brakes are released | 4 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |