| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 116 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 52 |
| Drive chain excessively loose |6.2.1d| | 45 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 42 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 40 |
| Registration plate issues | 31 |
| Drive chain worn to excess |6.2.1e| | 27 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 23 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 22 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 21 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 21 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 18 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 18 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 18 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 16 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 16 |
| Handlebar deformed |2.1.1b| | 15 |
| Front wheel bearings are excessively rough |2.3.5b| | 15 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Front wheel bearings have excessive free play |2.3.5b| | 14 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 14 |
| Drive chain excessively tight |6.2.1d| | 13 |
| Stop lamp remains on when the brake is released |1.3.1e| | 12 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 10 |
| Horn not working |1.7.3a| | 10 |
| Rear Drive chain sprocket carrier worn to excess |6.2.1e| | 10 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 9 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 9 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 8 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 8 |
| Rear reflector on motorcycle missing |1.4.1| | 8 |
| Throttle operating incorrectly |6.2.1f| | 8 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 8 |
| Rear Brake locking device missing |3.2.A1e| | 7 |
| Steering headbearing has excessive free play |2.2.2| | 7 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 7 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 5 |
| Rear Drive chain worn to excess |6.2.1e| | 5 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 5 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 5 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 5 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 4 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 4 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 4 |
| Rear Brake excessively binding (1.2.1 (f)) | 4 |
| Front Brake excessively binding (1.2.1 (f)) | 4 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Rear Brake cable excessively corroded |3.2.A1b| | 4 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 4 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 4 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 3 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 3 |
| Offside Rear Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Headlamp insecure |1.2.3b| | 3 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 3 |
| Front Brake fluid reservoir leaking hydraulic fluid |3.2.B1e| | 3 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 3 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 3 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 3 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 3 |
| Offside Front Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Nearside Rear Footrest missing |6.2.1a| | 2 |
| Offside Rear Footrest missing |6.2.1a| | 2 |
| Front position lamp damaged and function impaired |1.1.1b| | 2 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Front Position lamp not working |4.2.1 |a|| | 2 |
| Headlamp aim not tested |1.6| | 2 |
| Centre Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 2 |
| Rear Drive chain excessively tight |6.2.1d| | 2 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 2 |
| Rear suspension component excessively corroded. |2.4.A.1a| | 2 |
| Front Wheel bearing rough when rotated |5.1.3 |b| |i|| | 2 |
| Front Position lamp not working (4.2.1 (a)) | 2 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 2 |
| Rear Brake linkage clevis joint excessively worn |3.2.A1d| | 2 |
| An item not tested |Manual| | 2 |
| Horn not working (7.7 (a) (ii)) | 2 |
| 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| | 2 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Brake linkage has abnormal movement due to maladjustment |3.2.A1i| | 2 |
| Rear position lamp insecure |1.1.1c| | 2 |
| Riders seat insecure |6.2.1a| | 2 |
| Offside Front Direction indicator insecure |1.5.3b| | 2 |
| Front Handlebar deformed |2.1.1b| | 2 |
| Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 2 |
| Stop lamp remains on when the brakes are released | 2 |
| Front Horn not working |1.7.3a| | 2 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 2 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 2 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 2 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 2 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Front Front position lamp damaged and function impaired |1.1.1b| | 2 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 2 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 2 |
| Front Riders seat insecure |6.2.1a| | 2 |
| Rear Brake pedal pivots excessively worn |3.1.3a| | 2 |
| Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 2 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 2 |
| Brake reaction bracket insecure |3.2.A1j| | 2 |
| Front Steering headbearing has excessive free play |2.2.2| | 2 |