| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 113 |
| Rear reflector on motorcycle missing |1.4.1| | 91 |
| Drive chain excessively loose |6.2.1d| | 63 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 53 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 40 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 37 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 35 |
| Drive chain worn to excess |6.2.1e| | 35 |
| Registration plate issues | 30 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 26 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 23 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 22 |
| Offside Rear Footrest missing |6.2.1a| | 21 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 21 |
| Throttle operating incorrectly |6.2.1f| | 21 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 20 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 19 |
| Steering headbearing has excessive free play |2.2.2| | 19 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 17 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 16 |
| Nearside Rear Footrest missing |6.2.1a| | 16 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 15 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Fuel system component insecure |7.2.1b| | 12 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 11 |
| Offside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 10 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 10 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 10 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Rear Footrest missing |6.2.1a| | 10 |
| Drive chain excessively tight |6.2.1d| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 10 |
| Horn not working |1.7.3a| | 9 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 9 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 9 |
| Offside Rear Direction indicator not working |1.5.1c| | 8 |
| Direction indicators not working |1.5.1c| | 8 |
| Nearside Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 8 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 8 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 8 |
| Rear Drive chain excessively loose |6.2.1d| | 8 |
| Nearside Rear Direction indicator not working |1.5.1c| | 8 |
| Rear position lamp insecure |1.1.1c| | 7 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 7 |
| Nearside Front Direction indicator not working |1.5.1c| | 7 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 7 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 7 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 7 |
| Front wheel bearings have excessive free play |2.3.5b| | 7 |
| Nearside Front Direction indicators 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 |
| Offside Front Direction indicators not working |1.5.1c| | 6 |
| Steering control has Insufficient clearance at full lock affecting the riders grasp of handlebars |2.1.2b| | 6 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 6 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 6 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 6 |
| Front wheel bearings are excessively rough |2.3.5b| | 5 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 5 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 5 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 5 |
| Front Direction indicator not working |1.5.1c| | 5 |
| Dipswitch does not extinquish main beam/s, leaving at least 1 dipped beam headlamp |1.2.2b|i|| | 5 |
| Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Rear Direction indicators not working |1.5.1c| | 5 |
| Rear Drive chain worn to excess |6.2.1e| | 5 |
| Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Offside Front Direction indicator insecure |1.5.3b| | 5 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 5 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 5 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Offside Front Direction indicator not working |1.5.1c| | 5 |
| Front Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 5 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 5 |
| Rear wheel bearings are excessively rough |2.4.A.2c| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Front suspension has inadequate damping effect. |2.3.6c| | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Front Direction indicators not working |1.5.1c| | 4 |
| Nearside Handlebar deformed |2.1.1b| | 4 |
| Offside Handlebar deformed |2.1.1b| | 4 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 4 |
| Nearside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 4 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 4 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 4 |
| Exhaust mounting missing |7.1.1c| | 4 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Dipswitch does not deflect the main beam/s, making them into dipped beam/s |1.2.2b|ii|| | 4 |
| Headlamp switch faulty |1.2.4| | 4 |
| Fuel system component leaking |7.2.1a| | 4 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Fuel tank insecure (6.1.3 (a) (i)) | 4 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Rear wheel rotation likely to be impeded |6.2.1b| | 3 |
| Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Nearside Rear Drive chain excessively loose |6.2.1d| | 3 |
| Front Fairings insecure and likely to impede the steering |2.1.2e| | 3 |
| Headlamp aim not tested |4.1.2 |b|| | 3 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Offside Rear Direction indicators not working |1.5.1c| | 3 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 3 |
| Front mudguard insecure |2.3.7| | 3 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 3 |
| Nearside Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 3 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 3 |
| Headlamp aim not tested |1.6| | 3 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Riders seat insecure |6.2.1a| | 3 |
| Offside Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 3 |
| Rear Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 3 |
| Front Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 3 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 3 |
| Offside Rear Footrest insecure |6.2.1a| | 3 |
| Front Front mudguard insecure |2.3.7| | 3 |
| Centre Rear reflector on motorcycle missing |1.4.1| | 3 |
| Front Fuel system component insecure |7.2.1b| | 3 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Rear Direction indicator not working |1.5.1c| | 3 |
| Brake hose damaged | 3 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 3 |
| Rear Stop lamp does not emit a steady light |1.3.1b| | 3 |
| Front position lamp incorrect colour |1.1.2a| | 3 |
| Nearside Front Direction indicator insecure |1.5.3b| | 3 |
| Rear Brake pedal insecure |3.1.2a| | 3 |
| Offside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Front Brake caliper|s| securing bolt|s| loose |3.2.A1j| | 3 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 3 |
| Rear reflector missing (4.8.2 (a) (ii)) | 3 |