| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 19 |
| Rear reflector on motorcycle missing |1.4.1| | 9 |
| Registration plate issues | 7 |
| Horn not working |1.7.3a| | 7 |
| Direction indicators not working |1.5.1c| | 3 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 2 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Throttle operating incorrectly |6.2.1f| | 2 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 2 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 2 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 2 |
| Nearside Front Direction indicator missing |1.5.1a| | 2 |
| Offside Front Direction indicator missing |1.5.1a| | 2 |
| Nearside Rear Direction indicator missing |1.5.1a| | 2 |
| Offside Rear Direction indicator missing |1.5.1a| | 2 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 2 |
| Brake hose damaged | 1 |
| Nearside Rear Upper Direction indicator not working |1.5.1c| | 1 |
| Front Upper Steering movement excessively stiff with the wheel raised |2.2.1b| | 1 |
| Nearside Rear Lower Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 1 |
| Offside Rear Lower Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 1 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 1 |
| Horn not working (7.7 (a) (ii)) | 1 |
| Rear Brake caliper leaking (1.1.16 (b) (i)) | 1 |
| Central Front Upper Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 1 |
| Front position lamp adversely affected by the operation of another lamp |1.1.3b| | 1 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 1 |
| Brake reaction bracket insecure |3.2.A1j| | 1 |
| Nearside Front Direction indicators not working |1.5.1c| | 1 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 1 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 1 |
| Fuel tank leaking |7.2.1a| | 1 |
| Brake locking device missing rear caliper/torque arm locking device (3.2.A1e) | 1 |
| Rear reflector missing (4.8.2 (a) (ii)) | 1 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 1 |
| Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 1 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 1 |
| Horn not working (7.7 (a)) | 1 |
| Drive chain worn to excess |6.2.1e| | 1 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Rear Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 1 |
| Rear Brake caliper|s| securing bolt|s| loose |3.2.A1j| | 1 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Drive chain excessively tight |6.2.1d| | 1 |
| Front Horn not working |7.7 |a| |ii|| | 1 |
| Front Steering headbearing has excessive free play |2.2.2| | 1 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 1 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 1 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 1 |
| Centre Front Front suspension fouling which affects the movement of the front suspension. |2.3.6a| | 1 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 1 |
| Rear Position lamp not working (4.2.1 (a)) | 1 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 1 |
| Drive chain excessively loose |6.2.1d| | 1 |
| Front suspension assembly component loose |2.3.1| | 1 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 1 |
| Rear Rear mono-shock pivot excessively worn |2.4.B.4| | 1 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Nearside Rear Lower Drive chain excessively loose |6.2.1d| | 1 |
| Direction indicator missing |1.5.1a| | 1 |
| Front wheel bearings are excessively rough |2.3.5b| | 1 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 1 |
| Rear Brake back plate|s| insecure |3.2.A1j| | 1 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 1 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 1 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 1 |
| Offside Front Upper Handlebar mounting clamp loose |2.1.1a| | 1 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 1 |
| Rear Brake pedal is inoperative |3.1.3c| | 1 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 1 |
| Horn control not functioning. |1.7.2b| | 1 |
| 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| | 1 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Dipswitch does not deflect the main beam/s, making them into dipped beam/s |1.2.2b|ii|| | 1 |
| Front Direction indicator not working |1.5.1c| | 1 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 1 |
| Offside Front Brake disc|s| cracked |3.2.A1g| | 1 |
| Front position lamp missing |1.1.1a| | 1 |
| Rear position lamp missing |1.1.1a| | 1 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Offside Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Steering headbearing has excessive free play |2.2.2| | 1 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 1 |
| Rear Brake has no recorded effort at a wheel (1.2.1 (a) (ii)) | 1 |
| Rear Brake master cylinder leaking hydraulic fluid |3.2.B1e| | 1 |