| Most common failures | No# failures |
|---|
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 131 |
| Headlamp aim out of alignment | 126 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 75 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 70 |
| Horn not working |1.7.3a| | 58 |
| Riders seat insecure |6.2.1a| | 58 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 42 |
| Steering headbearing has excessive free play |2.2.2| | 39 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 32 |
| Registration plate issues | 31 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 26 |
| Fuel cap sealing washer missing |7.2.2c| | 25 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 24 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 22 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 16 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 16 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 15 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 15 |
| Headlamp aim not tested |1.6| | 14 |
| Exhaust excessively deteriorated |7.1.1a| | 14 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 13 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 12 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 12 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 12 |
| Stop lamp remains on when the brake is released |1.3.1e| | 12 |
| Brake lever has inadequate reserve travel |3.1.3b| | 10 |
| Direction indicators not working |1.5.1c| | 9 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 9 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 9 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 9 |
| Throttle operating incorrectly |6.2.1f| | 8 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Nearside Rear Direction indicator damaged and function impaired |1.5.3a| | 8 |
| Stop lamp remains on when the brakes are released | 8 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 7 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 7 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 7 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 7 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 7 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 6 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 6 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 6 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 6 |
| Headlamp aim beam image kick up to the offside |1.6| | 6 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 6 |
| 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| | 5 |
| Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Horn is not a constant note |1.7.3c| | 5 |
| Direction indicator not working |1.5.1c| | 5 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 5 |
| Steering headbearing has excessive wear or free play |2.2.2 |f| |i|| | 5 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 5 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 5 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 5 |
| Nearside Front Direction indicator not working |1.5.1c| | 5 |
| Front suspension assembly component excessively bent |2.3.1| | 5 |
| Horn control defective |1.7.2a| | 5 |
| Nearside Rear Direction indicator not working |1.5.1c| | 4 |
| Front Steering headbearing has excessive free play |2.2.2| | 4 |
| Offside Rear Direction indicator damaged and function impaired |1.5.3a| | 4 |
| Nearside Indicator tell tale not functioning |1.5.2| | 4 |
| Front Stop lamp missing |1.3.3a| | 4 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 4 |
| Nearside Direction indicator flashing more than 120 times per minute |1.5.1c| | 4 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 4 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 4 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 4 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 4 |
| Nearside Direction indicator not working |1.5.1c| | 4 |
| Nearside Front Direction indicator damaged and function impaired |1.5.3a| | 4 |
| Nearside Front Brake lever has inadequate reserve travel |3.1.3b| | 4 |
| Rear Shock absorber has negligible damping effect |5.3.2 |b|| | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Steering movement excessively rough with the wheel raised |2.2.1b| | 3 |
| Front suspension has inadequate damping effect. |2.3.6c| | 3 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Offside Direction indicator flashing more than 120 times per minute |1.5.1c| | 3 |
| Rear Brake lever has insufficient reserve travel (1.1.2 (a)) | 3 |
| Offside Front Direction indicator not working |1.5.1c| | 3 |
| Nearside Direction indicators not working |1.5.1c| | 3 |
| All direction indicators not working (4.4.1 (a) (ii)) | 3 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 3 |
| Front Direction indicator not working |1.5.1c| | 3 |
| Rear Direction indicator not working |1.5.1c| | 3 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 3 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 3 |
| Offside Direction indicator not working |1.5.1c| | 3 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 3 |
| Offside Rear Direction indicator not working |1.5.1c| | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 3 |
| Nearside Steering lock stop ineffective |2.1.3| | 3 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Riders seat insecure (6.2.5 (a) (ii)) | 3 |
| Rear Brake lever has insufficient reserve travel |1.1.2 |a|| | 3 |