| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 156 |
| Rear reflector on motorcycle missing |1.4.1| | 106 |
| Registration plate issues | 84 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 50 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 49 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 44 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 38 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 38 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 34 |
| Steering headbearing has excessive free play |2.2.2| | 33 |
| Throttle operating incorrectly |6.2.1f| | 28 |
| Drive chain excessively loose |6.2.1d| | 28 |
| Front wheel bearings have excessive free play |2.3.5b| | 25 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 25 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 24 |
| Horn not working |1.7.3a| | 23 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 23 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 21 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 21 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 21 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 20 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 20 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 18 |
| Drive chain worn to excess |6.2.1e| | 17 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 16 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 16 |
| Front wheel bearings are excessively rough |2.3.5b| | 14 |
| Parking brake: efficiency below requirements |3.7.B.7| | 13 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 13 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 13 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 12 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 12 |
| Windscreen wiper does not clear the windscreen effectively | 11 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 11 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 10 |
| Drive chain excessively tight |6.2.1d| | 10 |
| Rear Brake disc|s| cracked |3.2.A1g| | 10 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 10 |
| Offside Rear Footrest missing |6.2.1a| | 9 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 9 |
| Rear Drive chain excessively loose |6.2.1d| | 9 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 9 |
| Direction indicators not working |1.5.1c| | 9 |
| 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| | 9 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 9 |
| Registration plate lamp issues | 8 |
| Riders seat insecure |6.2.1a| | 8 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 8 |
| Nearside Rear Footrest missing |6.2.1a| | 8 |
| Rear Footrest missing |6.2.1a| | 8 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 8 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 8 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 8 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 8 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 7 |
| Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 7 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 7 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 7 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 7 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 7 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 7 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 7 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 7 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 6 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 6 |
| Offside Front Footrest insecure |6.2.1a| | 6 |
| Stop lamp remains on when the brake is released |1.3.1e| | 6 |
| Chain guard insecure |6.2.1c| | 6 |
| Offside Rear fog lamp not working |1.3.2b| | 6 |
| Nearside Front constant velocity joint gaiter split |2.5.C.1a| | 6 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Service brake: efficiency below requirements |3.7.B.7| | 5 |
| Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Nearside Front Direction indicators not working |1.5.1c| | 5 |
| Exhaust excessively deteriorated |7.1.1a| | 5 |
| Nearside Front Direction indicator not working |1.5.1c| | 5 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 5 |
| Rear parking brake recording little or no effort | 5 |
| Headlamp aim beam image kick up to the offside |1.6| | 5 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 5 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 5 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 5 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Steering control handlebar movement restricted by trapped cables |2.1.2c| | 5 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Rear fog lamp tell tale not working |1.3.1b| | 4 |
| Offside Rear Rear fog lamp missing |1.3.2a| | 4 |
| Front position lamp incorrect colour |1.1.2a| | 4 |
| Nearside Footrest insecure |6.2.1a| | 4 |
| Offside Footrest insecure |6.2.1a| | 4 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Indicator tell tale not functioning |1.5.2| | 4 |
| Offside Rear Footrest insecure |6.2.1a| | 4 |
| Front Steering headbearing has excessive free play |2.2.2| | 4 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 4 |
| Front Wheel spoke excessively loose |4.2.1b| | 4 |
| Offside Rear Direction indicators not working |1.5.1c| | 4 |
| Brake lever has inadequate reserve travel |3.1.3b| | 4 |
| Headlamp switch faulty |1.2.4| | 4 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 4 |
| Fuel system component leaking |7.2.1a| | 4 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 4 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Rear Brake fluid reservoir insecurely mounted |3.2.B1a| | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Brake hose damaged | 4 |
| Front Brake disc|s| cracked |3.2.A1g| | 4 |
| Rear Brake disc|s| has excessive run out |3.2.A1m| | 4 |
| Nearside Front Footrest insecure |6.2.1a| | 4 |
| Front suspension has inadequate damping effect. |2.3.6c| | 4 |
| Steering control handlebar movement restricted by taut cables |2.1.2c| | 4 |
| Fuel system component insecure |7.2.1b| | 4 |
| Nearside Rear Direction indicator not working |1.5.1c| | 4 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 4 |
| Brake pipe excessively corroded | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |