| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 74 |
| Drive chain excessively loose |6.2.1d| | 54 |
| Headlamp aim beam image kick up to the offside |1.6| | 49 |
| Rear reflector on motorcycle missing |1.4.1| | 49 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 41 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 38 |
| Registration plate issues | 35 |
| Front wheel bearings have excessive free play |2.3.5b| | 35 |
| Horn not working |1.7.3a| | 27 |
| Front wheel bearings are excessively rough |2.3.5b| | 25 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 25 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 25 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Drive chain worn to excess |6.2.1e| | 22 |
| Riders seat insecure |6.2.1a| | 22 |
| Offside Front Direction indicator not working |1.5.1c| | 17 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 17 |
| Steering headbearing has excessive free play |2.2.2| | 17 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 14 |
| Nearside Rear Direction indicator not working |1.5.1c| | 13 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 13 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 12 |
| Offside Front Direction indicators not working |1.5.1c| | 12 |
| Offside Rear Direction indicator not working |1.5.1c| | 11 |
| Nearside Rear Direction indicators not working |1.5.1c| | 11 |
| Stop lamp remains on when the brake is released |1.3.1e| | 11 |
| Nearside Rear Footrest missing |6.2.1a| | 11 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 11 |
| Brake hose damaged | 10 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 10 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 10 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 9 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 9 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 8 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 8 |
| Nearside Front Direction indicators not working |1.5.1c| | 8 |
| Rear Footrest missing |6.2.1a| | 8 |
| Drive chain excessively tight |6.2.1d| | 7 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 7 |
| Throttle operating incorrectly |6.2.1f| | 7 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 6 |
| Offside Handlebar deformed |2.1.1b| | 6 |
| Nearside Front Direction indicator not working |1.5.1c| | 6 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 6 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 6 |
| Direction indicators not working |1.5.1c| | 6 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 6 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 5 |
| Offside Rear Footrest missing |6.2.1a| | 5 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 5 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 5 |
| Rear Drive chain excessively loose |6.2.1d| | 5 |
| Rear Drive chain excessively tight |6.2.1d| | 5 |
| Front Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 5 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| 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| | 4 |
| Fuel system component leaking |7.2.1a| | 4 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 4 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 4 |
| Offside Rear Direction indicators not working |1.5.1c| | 4 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 4 |
| Brake pedal cannot be released smoothly |3.1.3d| | 4 |
| Nearside Front Direction indicator missing |1.5.1a| | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Offside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Direction indicator not working |1.5.1c| | 4 |
| Front Headlamp aim beam image kick-up is to the offside |1.6.1| | 4 |
| Headlamp aim not tested |1.6| | 4 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Front Direction indicator missing |1.5.1a| | 3 |
| Horn control defective |1.7.2a| | 3 |
| Rear Drive chain worn to excess |6.2.1e| | 3 |
| Footrest missing |6.2.1a| | 3 |
| Nearside Direction indicator not working |1.5.1c| | 3 |
| Front position lamp incorrect colour |1.1.2a| | 3 |
| Indicator switch insecure |1.5.4| | 3 |
| Rear Direction indicators not working |1.5.1c| | 3 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 3 |
| Offside Footrest missing |6.2.1a| | 3 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 3 |
| Rear Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 3 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 3 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 3 |
| Rear Rear suspension movement is excessively stiff |2.4.A.3b| | 3 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 3 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Chain guard insecure |6.2.1c| | 3 |
| Nearside Rear Direction indicator missing |1.5.1a| | 3 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 3 |
| Direction indicator missing |1.5.1a| | 3 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 3 |
| Rear suspension fouling which affects the movement of the rear suspension |2.4.A.3a| | 3 |
| Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Rear Seat insecure |6.2.1a| | 3 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 3 |
| Rear Stop lamp does not emit a steady light |1.3.1b| | 3 |
| Rear Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 3 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 3 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 2 |
| Rear Direction indicator missing |1.5.1a| | 2 |
| Nearside Front Direction indicator flashing less than 60 times a minute |1.5.1c| | 2 |
| Front Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 2 |
| Indicator tell tale not functioning |1.5.2| | 2 |
| Horn missing |1.7.1| | 2 |
| Offside Direction indicator not working |1.5.1c| | 2 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 2 |
| Nearside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 2 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 2 |
| Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Front Floor brake test indicates a severely juddering brake |3.3C2d.| | 2 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Nearside Steering lock stop ineffective |2.1.3| | 2 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 2 |
| Horn is not a constant note |1.7.3c| | 2 |
| Offside Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 2 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 2 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Rear Brake pedal is damaged and the brake cannot be readily applied |3.1.3c| | 2 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 2 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 2 |
| Offside Direction indicators not working |1.5.1c| | 2 |
| Nearside Direction indicators not working |1.5.1c| | 2 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Front Fairings insecure and likely to impede the steering |2.1.2e| | 2 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 2 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 2 |
| Front Direction indicator not working |1.5.1c| | 2 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Centre Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Steering control handlebar movement restricted by taut cables |2.1.2c| | 2 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Centre Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 2 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 2 |
| Steering damper ineffective |2.1.2d| | 2 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 2 |
| Nearside Handlebar deformed |2.1.1b| | 2 |
| Rear Brake disc|s| has excessive run out |3.2.A1m| | 2 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 2 |
| Steering control handlebar movement restricted by trapped cables |2.1.2c| | 2 |
| Brake pedal is positioned so that the brake cannot be readily applied |3.1.3c| | 2 |
| Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 2 |
| Fuel cap does not fasten securely by a positive means |7.2.2b| | 2 |
| Horn control not functioning. |1.7.2b| | 2 |
| Offside Front Direction indicator missing |1.5.1a| | 2 |
| Nearside Headlamp aim beam image kick up to the offside |1.6| | 2 |
| Brake pedal is bent and the brake cannot be readily applied |3.1.3c| | 2 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 2 |
| Lower Steering headbearing has excessive free play |2.2.2| | 2 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 2 |
| Brake pedal is damaged and the brake cannot be readily applied |3.1.3c| | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Front Brake disc|s| excessively scored |3.2.A1l| | 2 |
| Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Front Direction indicators not working |1.5.1c| | 2 |
| Front Steering headbearing has excessive free play |2.2.2| | 2 |
| Rear wheel spindle loose |2.4.A.2b| | 2 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 2 |
| Nearside Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 2 |
| Nearside Handlebar mounting clamp bolt loose |2.1.1a| | 2 |