| Most common failures | No# failures |
|---|
| Rear reflector on motorcycle missing |1.4.1| | 130 |
| Headlamp aim out of alignment | 87 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 48 |
| Drive chain excessively loose |6.2.1d| | 46 |
| Horn not working |1.7.3a| | 45 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 39 |
| Registration plate issues | 39 |
| Drive chain worn to excess |6.2.1e| | 38 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 38 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 35 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 34 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 31 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 25 |
| Headlamp insecure |1.2.3b| | 22 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 21 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 21 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 21 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 18 |
| Steering headbearing has excessive free play |2.2.2| | 16 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 15 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 15 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 13 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 12 |
| 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| | 11 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 11 |
| Nearside Rear Direction indicator not working |1.5.1c| | 11 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 10 |
| Direction indicators not working |1.5.1c| | 10 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 10 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 10 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 10 |
| Offside Rear Direction indicator not working |1.5.1c| | 9 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 9 |
| Handlebar deformed |2.1.1b| | 9 |
| Headlamp aim beam image kick up to the offside |1.6| | 9 |
| Nearside Rear Direction indicators not working |1.5.1c| | 9 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 9 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 9 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 9 |
| Riders seat insecure |6.2.1a| | 9 |
| 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 |
| Headlamp aim not tested |1.6| | 8 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 7 |
| Nearside Front Direction indicator not working |1.5.1c| | 7 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 6 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 6 |
| Offside Front Direction indicator not working |1.5.1c| | 6 |
| Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 5 |
| Offside Rear Direction indicators not working |1.5.1c| | 5 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 5 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 5 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 5 |
| Throttle operating incorrectly |6.2.1f| | 5 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 5 |
| Fuel cap sealing washer missing |7.2.2c| | 5 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Front Direction indicator not working |1.5.1c| | 5 |
| Rear Direction indicator not working |1.5.1c| | 5 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 5 |
| Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Direction indicator not working |1.5.1c| | 4 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 4 |
| Front Headlamp insecure |1.2.3b| | 4 |
| Rear Drive chain excessively loose |6.2.1d| | 4 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 4 |
| Drive chain excessively tight |6.2.1d| | 4 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 4 |
| Indicator switch insecure |1.5.4| | 4 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Rear position lamp insecure |1.1.1c| | 4 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 3 |
| Rear Brake pedal is inoperative |3.1.3c| | 3 |
| Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Nearside Rear Footrest missing |6.2.1a| | 3 |
| Offside Rear Footrest missing |6.2.1a| | 3 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 3 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 3 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| Rear Brake disc|s| cracked |3.2.A1g| | 3 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 3 |
| Rear Direction indicators not working |1.5.1c| | 3 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 3 |
| Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Front Direction indicators not working |1.5.1c| | 3 |
| Rear reflector missing |4.8.2 |a| |ii|| | 3 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Front Wheel spoke excessively loose |4.2.1b| | 3 |
| Front Steering headbearing has excessive free play |2.2.2| | 3 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 3 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 3 |
| Front Exhaust mounting missing |7.1.1c| | 2 |
| Offside Rear Direction indicator insecure |1.5.3b| | 2 |
| Rear position lamp incorrect colour |1.1.2b| | 2 |
| Direction indicator flashing less than 60 times a minute |1.5.1c| | 2 |
| Front position lamp adversely affected by the operation of another lamp |1.1.3b| | 2 |
| Front Brake lever is inoperative |3.1.3c| | 2 |
| Brake pedal pivots excessively worn |3.1.3a| | 2 |
| Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 2 |
| Front Brake disc|s| excessively scored |3.2.A1l| | 2 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 2 |
| Nearside Front Lower Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Fuel system component leaking |7.2.1a| | 2 |
| Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 2 |
| Centre Rear Upper Rear reflector on motorcycle missing |1.4.1| | 2 |
| Rear reflector on motorcycle obscured |1.4.1| | 2 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 2 |
| Rear Direction indicator insecure |1.5.3b| | 2 |
| Front position lamp insecure |1.1.1c| | 2 |
| Rear suspension component loose |2.4.A.1a| | 2 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 2 |
| Rear Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 2 |
| Indicator switch defective |1.5.4| | 2 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 2 |
| Front position lamp incorrect colour |1.1.2a| | 2 |
| Rear position lamp deteriorated and function impaired |1.1.1b| | 2 |
| Stop lamp does not emit a steady light |1.3.1b| | 2 |
| Lower Rear mono-shock pivot excessively worn |2.4.B.4| | 2 |
| Brake lever insecure |3.1.2a| | 2 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 2 |
| Nearside Front Direction indicators not working |1.5.1c| | 2 |
| Nearside Rear Drive chain worn to excess |6.2.1e| | 2 |
| Front Direction indicators affected by the operation of another lamp |1.5.1c| | 2 |
| Rear Direction indicators affected by the operation of another lamp |1.5.1c| | 2 |
| Rear Footrest missing |6.2.1a| | 2 |
| Direction indicator missing |1.5.1a| | 2 |
| Front Stop lamp missing |1.3.3a| | 2 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 2 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 2 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Rear Position lamp not working |4.2.1 |a|| | 2 |
| Offside Front Direction indicators not working |1.5.1c| | 2 |
| Rear Lower Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Front suspension assembly component excessively misaligned |2.3.1| | 2 |
| Rear Wheel spoke missing |4.2.1b| | 2 |
| Front suspension has inadequate damping effect. |2.3.6c| | 2 |
| Rear Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Nearside Rear Direction indicator missing |1.5.1a| | 2 |
| Front Horn not working |1.7.3a| | 2 |
| Front Lower Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Front Brake caliper|s| insecure |3.2.A1j| | 2 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 2 |
| Front Direction indicator flashing less than 60 times a minute |1.5.1c| | 2 |
| Rear Direction indicator flashing less than 60 times a minute |1.5.1c| | 2 |
| Front Brake performance not tested |3.3| | 2 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 2 |
| Nearside Front Direction indicator obscured |1.5.1a| | 2 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 2 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 2 |
| Offside Direction indicator not working |1.5.1c| | 2 |
| Rear Hydraulic brake control feels spongy |3.1.4a| | 2 |
| Rear Brake cylinder leaking hydraulic fluid |3.2.B1e| | 2 |
| Horn is not continous or uniform |1.7.3c| | 2 |
| Direction indicator affected by the operation of another lamp |1.5.1c| | 2 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Rear Drive chain worn to excess |6.2.1e| | 2 |
| Headlamp switch faulty |1.2.4| | 2 |