| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 163 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 92 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 73 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 46 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 45 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 40 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 40 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 39 |
| Rear reflector on motorcycle missing |1.4.1| | 29 |
| Steering headbearing has excessive free play |2.2.2| | 29 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 25 |
| Registration plate issues | 21 |
| Front wheel bearings have excessive free play |2.3.5b| | 19 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 18 |
| Headlamp insecure |1.2.3b| | 18 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 17 |
| Rear reflector on motorcycle obscured |1.4.1| | 17 |
| Front wheel bearings are excessively rough |2.3.5b| | 16 |
| Horn not working |1.7.3a| | 14 |
| Throttle operating incorrectly |6.2.1f| | 14 |
| Riders seat insecure |6.2.1a| | 14 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 13 |
| Nearside Front Direction indicator not working |1.5.1c| | 13 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 12 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 12 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 11 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 10 |
| Headlamp aim not tested |1.6| | 9 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 9 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 9 |
| Offside Front Direction indicator not working |1.5.1c| | 9 |
| Nearside Rear Direction indicator not working |1.5.1c| | 9 |
| Nearside Rear Direction indicators not working |1.5.1c| | 8 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 8 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 8 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 8 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 8 |
| Rear Brake lever insecure |3.1.2a| | 8 |
| Nearside Front Direction indicators not working |1.5.1c| | 8 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 8 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 7 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 7 |
| Offside Rear Direction indicator not working |1.5.1c| | 7 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 7 |
| Horn control defective |1.7.2a| | 7 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 7 |
| 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| | 7 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 6 |
| Direction indicators not working |1.5.1c| | 6 |
| Offside Rear Direction indicators not working |1.5.1c| | 6 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Fuel cap sealing washer missing |7.2.2c| | 5 |
| Exhaust excessively deteriorated |7.1.1a| | 5 |
| Front Direction indicator not working |1.5.1c| | 5 |
| Handlebar deformed |2.1.1b| | 5 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 5 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 4 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Rear reflector on motorcycle obscured |1.4.2b| | 4 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Nearside Brake lever has inadequate reserve travel |3.1.3b| | 4 |
| Rear Rear reflector on motorcycle obscured |1.4.1| | 4 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 4 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 4 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 4 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Offside Front Direction indicators not working |1.5.1c| | 4 |
| Front Headlamp insecure |1.2.3b| | 4 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 4 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Front Wheel alignment incorrect which adversely affects the steering |2.5.1| | 4 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 4 |
| Offside Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 4 |
| Rear Brake lever mounting insecure |3.1.2a| | 4 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Registration plate lamp issues | 4 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 3 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 3 |
| Front Steering headbearing has excessive free play |2.2.2| | 3 |
| Indicator tell tale not functioning |1.5.2| | 3 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 3 |
| Front position lamp insecure |1.1.1c| | 3 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Nearside Brake lever insecure |3.1.2a| | 3 |
| Nearside Direction indicators not working |1.5.1c| | 3 |
| Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Front suspension has inadequate damping effect. |2.3.6c| | 3 |
| Rear Direction indicator not working |1.5.1c| | 3 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 3 |
| Horn control not functioning. |1.7.2b| | 3 |
| Centre Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 3 |
| Rear wheel has a loose wheel nut|s| |4.2.3a| | 3 |
| Headlamp switch faulty |1.2.4| | 3 |
| Offside Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Front Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Offside Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 3 |
| Headlamp insecure (4.1.1 (c)) | 3 |
| Rear Brake lever insecure (1.1.2 (e) (i)) | 3 |